Answer:
A new organism in an ecosystem can either greatly downgrade the quality of the ecosystem, upgrade, or bring no significant changes. Although it does usually benefit the ecosystem, it's safe to say some organisms may bring a decline to vital animals already present in the ecosystem. For example, if a new and quite aggressive species are introduced to the ecosystem, it may not have natural predators that would control its amount. That would cause an overabundance of that species and a decline in other organisms that they feed on. It can overbreed and spread throughout the ecosystem eating all the species that can't compete with them (due to the fact that the ecosystem does not have a defense against them).
It's 8 points and you didn't even say thanks to the person who answered for you. smh
bonding is similar to ionic bonding, except there are no high-electronegativity atoms present to accept any electrons that the present atoms are willing to donate. bonds are responsible for binding atoms together within a molecule of propane, whereas bonds bind separate propane molecules together in a condensed state (liquid or crystal). bonds are the only primary bonds that are directionally dependent. Materials whose constituent particles are bound by bonding are generally expected to have the lowest melting temperatures. Choose and fill the blanks from the following options: (a) Covalent (b) Ionic (c) Van der Waals (d) Hydrogen (e) Metallic
bonds are the only primary bonds that are directionally dependent. Materials whose constituent particles are bound by bonding are generally expected to have the lowest melting temperatures
The correct options to fill in the blanks are is a)covalent bond.
• Bonding is similar to covalent bonding, except there are no high-electronegativity atoms present to accept any electrons that the present atoms are willing to donate.
• Covalent bonds are responsible for binding atoms together within a molecule of propane, whereas van der Waals bonds bind separate propane molecules together in a condensed state (liquid or crystal).
• Covalent bonds are the only primary bonds that are directionally dependent.
• Materials whose constituent particles are bound by metallic bonding are generally expected to have the lowest melting temperatures.
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The drawings below represent four different forms of electromagnetic energy.
Which diagram represents electromagnetic energy with the longest wavelength?
A
B
C
D
The diagram B represents electromagnetic energy with the longest wavelength.
What is wavelength ?
The Greek letter lambda (λ), which represents wavelength, is frequently used. When describing modulated waves, their sinusoidal envelopes, or waves created by the interference of several sinusoids, the term wavelength is also occasionally used.
What is electromagnetic energy ?
Radiant energy called electromagnetic energy moves in waves at the speed of light. It can also be referred to as radiant energy, light, electromagnetic waves, electromagnetic radiation, or the motion of electromagnetic waves. Heat can be transferred through electromagnetic radiation.
Therefore, The diagram B represents electromagnetic energy with the longest wavelength.
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Managing a salt-water aquarium. A tank at the New Jersey State Aquarium has a volume of 2.9 million liters.' Bacteria are used to remove nitrate that would otherwise build up to toxic levels. Aquarium water is first pumped into a 2 700-L deaeration tank containing bacteria that consume 02 in the presence of added methanol: Bacteria 2CH3OH + 302 2002 + 4H20 (1) Methanol Anoxic (deoxygenated) water from the deaeration tank flows into a 1 500-L denitrification reactor containing colonies of Pseudomonas bacteria in a porous medium. Methanol is injected continuously and nitrate is converted into nitrite and then into nitrogen: Bacteria 3NO3 + CH3OH → 3NO2 + CO2 + 2H20 (2) Nitrate nitrite Bacteria 2NOZ + CH3OH → N2 + CO2 + H2O + 20H (3) (a) Deaeration can be thought of as a slow, bacteria-mediated titra- tion of O2 by CH3OH. The concentration of O2 in seawater at 24°C is 220 MM. How many liters of CH3OH (FM 32.04, density = 0.791 g/mL) are required by Reaction 1 for 2.9 million liters of aquarium water? (b) Write the net reaction showing nitrate plus methanol going to nitrogen. How many liters of CH3OH are required by the net reaction for 2.9 million liters of aquarium water with a nitrate concentration of 8 100 uM? (c) In addition to consuming methanol for Reactions 1 through 3, the bacteria require 30% more methanol for their own growth. What is the total volume of methanol required to denitrify 2.9 million liters of aquarium water?
A)17,300 L liters of CH3OH (FM 32.04, density = 0.791 g/mL) are required by Reaction 1 for 2.9 million liters of aquarium water.
B)192L liters of CH3OH are required by the net reaction for 2.9 million liters of aquarium water with a nitrate concentration of 8 100 uM.
C)The total volume of methanol required to denitrify 2.9 million liters of aquarium water is 22,496 L.
(a) To calculate the amount of CH3OH required for Reaction 1, we need to first determine the amount of O2 in 2.9 million liters of aquarium water.
Concentration of O2 in seawater = 220 mM
Volume of aquarium water = 2.9 million L
Amount of O2 in aquarium water = concentration x volume = 220 mM x 2.9 million L = 6.38 x 10^8 mmol
From the balanced chemical equation for Reaction 1, we see that 3 moles of O2 react with 2 moles of CH3OH. Therefore, the number of moles of CH3OH required is:
(2/3) x (6.38 x 10^8 mmol O2) = 4.25 x 10^8 mmol CH3OH
To convert this to volume, we need to use the density of CH3OH:
density = 0.791 g/mL
molar mass of CH3OH = 32.04 g/mol
volume of CH3OH = (4.25 x 10^8 mmol) x (32.04 g/mol) / (0.791 g/mL) = 1.73 x 10^7 mL = 17,300 L
(b) The net reaction for denitrification is:
5NO3- + CH3OH + 4H+ → N2 + 3CO2 + 7H2O
From the balanced chemical equation, we see that 1 mole of CH3OH is required for every 5 moles of NO3-. The concentration of nitrate in the aquarium water is 8,100 uM, which is equivalent to 8.1 mM.
Number of moles of nitrate in aquarium water = concentration x volume = 8.1 mM x 2.9 million L = 2.35 x 10^7 mmol
Number of moles of CH3OH required = (1/5) x (2.35 x 10^7 mmol) = 4.7 x 10^6 mmol
To convert this to volume, we use the same calculation as in part (a):
volume of CH3OH = (4.7 x 10^6 mmol) x (32.04 g/mol) / (0.791 g/mL) = 1.92 x 10^5 mL = 192 L
(c) The bacteria require 30% more methanol for their own growth, which means we need to add an additional 30% of the methanol required for Reactions 1-3.
Total volume of methanol required = volume from part (a) + volume from part (b) + 0.3 x (volume from part (b))
Total volume of methanol required = 17,300 L + 192 L + 0.3 x 192 L = 22,496 L
Therefore, the total volume of methanol required to denitrify 2.9 million liters of aquarium water is 22,496 L.
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*You have a 1.2 M solution of CaCi, that has a final volume of 0.050 L a.
How many moles of CaCly are generated in the reaction?
b.
How many grams of CaCly are generated in the reaction?
The number of moles is 0.06 moles while the mass is 6.66 g
What is the mole?The mole is a unit of measurement used in chemistry to express amounts of a substance. One mole of a substance is defined as the amount of that substance that contains as many entities, such as atoms, molecules, or ions, as there are in 12 grams of carbon-12, which is a common isotope of carbon.
Number of moles = 1.2 * 0.05
= 0.06 moles
Mass of the CaCl2 = 0.06 moles * 111 g
= 6.66 g
The mole is used to make it easier to compare the amounts of different substances in chemical reactions, and to calculate the amounts of reactants needed to produce a certain amount of product.
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enter all allowable magnetic quantum numbers for each of the principal and angular momentum quantum number combinations given below.
For principal quantum number n = 1, l = 0 and m = 0.
For n = 2, l= 0, 1 and m = -1,0,1.
For n = 3, l = 0,1,2 and m = -2,-1,0,1,2
The magnetic quantum number (m) is one of the four quantum numbers used to describe the unique state of an electron in an atom. It goes from -l to +l.
a. For n=1 and l=0, the only allowable magnetic quantum number is 0.
b. For n=2 and l=0, the only allowable magnetic quantum number is 0.
c. For n=2 and l=1, the allowable magnetic quantum numbers are -1, 0, and 1.
d. For n=3 and l=0, the only allowable magnetic quantum number is 0.
e. For n=3 and l=1, the allowable magnetic quantum numbers are -1, 0, and 1.
f. For n=3 and l=2, the allowable magnetic quantum numbers are -2, -1, 0, 1, and 2.
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--The complete question is, Enter all allowable magnetic quantum numbers for each of the principal and angular momentum quantum number combinations given below.
a. n= 1, l =0
b. n =2 , l = 0
c. n =2, l =1
d. n =3, l =0
e. n =3, l =1
f. n =3, l =2--
balance the following equation using the smallest possible integers and determine the coefficient of hcl? fe2s3 hcl --> fecl3 h2s
The balanced chemical equation for the given reaction is given as,
Fe₂S₃ + 6HCl → 2FeCl₃ + 3H₂S
A balanced chemical equation is defined as an equation where the number of atoms of each type in the reaction is the same on both reactants and product sides. Generally, the mass, as well as the change, are equal in a balanced chemical equation.
Basically chemical equation is said to be unbalanced if the number of atoms of each element on the left-hand side is not equal to the number of atoms present on the right-hand side. The balanced chemical equation remains always in accordance with the Law of Conservation of Mass.
The coefficient of the HCl is 6.
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From a pH meter titration curve a student experimentally determines the pK a of benzoic acid to be 4.06. Calculate the experimental Ka for benzoic acid. If Ka for benzoic acid is 6.3 × 10-5 determine the percent error in their experimental results.
(1pts)
Experimental Ka for benzoic acid
(1pts)
Percent error to 2 significant figures
The percent error to 2 significant figures is 11%.
What is Titration?
Titration is a laboratory technique used to determine the concentration of a solution by reacting it with a standard solution of known concentration. The process involves adding the standard solution to the solution of unknown concentration until the reaction is complete, at which point the amount of standard solution needed to reach the endpoint is used to calculate the concentration of the unknown solution.
The relationship between pKa and Ka is given by:
pKa = -log(Ka)
Rearranging this equation, we get:
Ka = 10^(-pKa)
Substituting the given value of pKa = 4.06, we get:
Ka = 10^(-4.06) = 7.01 x 10^(-5)
The experimental Ka for benzoic acid is 7.01 x 10^(-5).
To calculate the percent error, we use the formula:
percent error = (|experimental value - accepted value| / accepted value) x 100%
Substituting the given values, we get:
percent error = (|7.01 x 10^(-5) - 6.3 x 10^(-5)| / 6.3 x 10^(-5)) x 100%
percent error = 11.19%
The percent error to 2 significant figures is 11%.
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what is the balance of _NaCl + _F2 --> _NaF + _Cl2
Answer:
The balanced equation is
2NaCl + F2 ---> 2NaF + Cl2
which of the following birth outcomes are possible as a result of prenatal exposure to airborne polycyclic aromatic hydrocarbons (pahs)? select all that are true.
The birth outcomes are possible as a result of prenatal exposure to airborne polycyclic aromatic hydrocarbons is the correct option is e) All of the above.
The birth outcomes that are possible as the result of the prenatal exposure to the airborne polycyclic aromatic hydrocarbons are :
a) Reduced birth length
b) Reduced birth weight
c) Smaller head circumference
d) Shortened gestation
The Prenatal exposure to the PAHs has been connected with the ADHD that is the symptoms of the anxiety, the depression and the inattention, and also the behavioral disorders, that are all thought to the related to the deficits in the self - regulation.
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This question is incomplete, the complete question is :
which of the following birth outcomes are possible as a result of prenatal exposure to airborne polycyclic aromatic hydrocarbons (PAHs)? select all that are true.
a) Reduced birth length
b) Reduced birth weight
c) Smaller head circumference
d) Shortened gestation
e) All of the above
Indicate the substance that contains the most negatively charged anion. O Mg3N2 O Al 203 O BaCl2 O Srs
Answer:
Mg3N2
Explanation:
Consider the molecule below, then identify which changes would produce molecule with the most intense C-C signal in an IR spectrum_ Ha Hb Hc Hd Changing Ha and Hbto Br Changing Ha to F and Hc to Br Changing Ha to Fand Hd to Br Changing Ha to F Changing Ha to and Hbto Br
Identifying the molecule with the most intense C-C signal in an IR spectrum in the following manner.
Infrared spectroscopy (IR) detects the vibrations of covalent bonds in a molecule. The C-C bond typically absorbs in the mid-infrared (MIR) region, between 1200-800 cm^-1. The intensity of the C-C signal depends on the strength of the bond, the symmetry of the molecule, and the number of C-C bonds present.
Changing Ha and Hb to Br: This substitution will not necessarily increase the strength of the C-C bond or the number of C-C bonds, and may not affect the symmetry of the molecule. Therefore, this change is unlikely to produce a molecule with the most intense C-C signal.
Changing Ha to F and Hc to Br: This substitution will create a fluorine atom on one of the carbons and a bromine atom on another carbon. The electronegativity of fluorine is greater than that of carbon, which may result in a stronger C-C bond. Additionally, the molecule will have two different halogen atoms, which could increase the intensity of the signal due to increased symmetry. Therefore, this change could potentially create a molecule with a more intense C-C signal.
Changing Ha to F and Hd to Br: Similar to the above, this substitution will create a fluorine atom on one of the carbons and a bromine atom on another carbon. The molecule will also have two different halogen atoms, which could increase the symmetry of the molecule and the intensity of the signal. Therefore, this change could potentially create a molecule with a more intense C-C signal.
Changing Ha to F: This substitution will not necessarily increase the strength of the C-C bond or the number of C-C bonds, and may not affect the symmetry of the molecule. Therefore, this change is unlikely to produce a molecule with the most intense C-C signal.
Changing Ha to F and Hb to Br: This substitution will create a fluorine atom on one of the carbons and a bromine atom on another carbon. The molecule will have two different halogen atoms, which could increase the symmetry of the molecule and the intensity of the signal. However, it may not necessarily increase the strength of the C-C bond or the number of C-C bonds. Therefore, this change is less likely to create a molecule with the most intense C-C signal compared to the previous two changes.
Overall, changing Ha to F and Hc or Hd to Br may potentially create a molecule with the most intense C-C signal in an IR spectrum. However, it's important to note that other factors could also impact the intensity of the signal, and that the specific molecule in question needs to be examined to make an accurate prediction.
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If a precipitation reaction occurs, what will be the products of the unbalanced
reaction shown below?
Pb(NO3)2(aq) + K₂(SO4)(aq) →
Solubility Table
A. PbSO4(s) + KNO3(s)
B. PbSO4(aq) + KNO3(s)
C. No precipitate will form.
D. PbSO4(s) + KNO3(aq)
The products of the reaction are PbSO4(s) + KNO3(aq)
How does a precipitate form in a reaction?A precipitate is a solid that forms and separates out of a solution as the result of a chemical reaction. Precipitation reactions occur when two solutions containing ions are mixed together and the resulting mixture is no longer able to hold the ions in solution, causing them to form an insoluble solid.
In order to predict whether a precipitate will form or not, the solubility rules can be used to determine if a compound is soluble or insoluble in a particular solution. If the resulting compound is insoluble, a precipitate will form.
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hich are characteristics of photosynthesis? (Select all that apply.)
Plants use this process to make their food.
It provides the energy that we obtain from our food.
It takes place in the flower of a plant.
Oxygen is provided to animals from this process.
Answer:
Explanation:
A, B, D not C. It takes place in the leaves
the lattice enthalpy of licl is positive, indicating that it takes energy to break the ions apart in licl. however, the dissolution of licl in water is an exothermic process. identify all particle-particle interactions that contribute significantly to the dissolution process being exothermic. for each interaction, include the particles that interact and the specific type of intermolecular force between those particles.
When LiCl dissolves in water, the Li+ and Cl- ions become hydrated by water molecules, and these hydration interactions are the main contributors to the dissolution process being exothermic.
Specifically, the exothermicity arises due to the attractive electrostatic interactions between the ions and water molecules, which release energy as heat when the ions become surrounded by the solvent molecules.
In addition, the water molecules also form hydrogen bonds with each other and with the ions, further stabilizing the hydrated complex and contributing to the overall exothermicity of the process.
Therefore, the dissolution of LiCl in water is exothermic due to the particle-particle interactions between the ions and water molecules, including electrostatic interactions and hydrogen bonding.
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A sewage lagoon that has a surface area of 100,000 m2 (10 ha) and a depth of 1 m is receiving 8,640 m3/d of sewage containing 100 mg/L of biodegradable contaminant. At a steady state, the effluent from the lagoon must not exceed 20 mg/L of biodegradable contaminant. Assuming the lagoon is well mixed and that there are no losses or gains of water in the lagoon other than the sewage input, what biodegradation reaction rate coefficient (d-1) must be achieved?
The biodegradation reaction rate coefficient (d-1) must be achieved for the required concentration of exit stream is 0.003456 /day.
What is biodegradation ?
The term biodegradation is defined as the degradation of the materials into environmentally acceptable products such as water, carbon dioxide, and biomass by the action of naturally available microorganisms under normal environmental conditions.
Suppose C₀ represent the initial concentration of the biodegradable organic material = 100 g/L = 100 g/m³
Then,C be the concentration of biodegradable organic material that leaves the lagoon = 20 mg/L = 20 g/m³
Now, the rate constant be k
Let V be the volume of the lagoon
= 10 hectares × 1 m
= 100000 × 1
= 100000 m³
F₀ be the flow rate of in fluent into the first lagoon = 8640 m³/day
(kC₀V/F₀) = (C₀ - C)/C
(k×100×100000/8640)
= (100-20)/20
k = (4×8640)/(100×100000)
= 0.003456 /day
Thus, The biodegradation reaction rate coefficient (d-1) must be achieved for the required concentration of exit stream is 0.003456 /day.
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A hydrate of sodium carbonate, Na₂CO3, has a mass of 4.31 g before heating. After heating, the mass of the anhydrous
compound is found to be 3.22 g.
What is the mass of water in the original sample?
A hydrate of sodium carbonate, Na[tex]_2[/tex]CO[tex]_3[/tex] has a mass of 4.31 g before heating. After heating, the mass of the anhydrous compound is found to be 3.22 g. Therefore, The mass of water in the original sample is 1.09g.
What is sodium carbonate?Sodium carbonate is an inorganic compound with the formula Na[tex]_2[/tex]CO[tex]_3[/tex], where x may range from 0 and 10. All forms are water-soluble, white, unscented salts that generate alkaline water solutions. It was historically made first from ash of plants grown in sodium-rich soil.
Before heating, a hydrates of sodium carbonate, Na[tex]_2[/tex]CO[tex]_3[/tex], does have a mass of 4.31 g. The weight of the anhydrous salt after heating is determined to be 3.22 g. The original sample contains 4.31-3.22 =1.09g of water.
Therefore, the mass of water in the original sample is 1.09g.
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Iron (II) sulfide contains 36.47% sulfer by mass. If 87.91 g of iron sulfide is made by reacting iron with sulfer, what mass of iron was reacted?
36.47% of the mass of iron (II) sulfide is sulfur. If 87.91 g of iron sulfide is produced by reacting iron with sulfur, the amount of iron that was reacted is 87.91 g Fe(II) sulfur multiplied by 63.53% Fe (II) equals 55.85 g Fe (II)
What is meant by sulfur?The chemical element sulfur, which has an atomic number of 16, is known to people because it is thought to be the least reactive element. Prior to that, it was employed in the vulcanization of natural rubber as well as the production of fertilizers. Sulfur is used to vulcanize black rubber, as a fungicide, and in the production of black gunpowder. The creation of sulfuric acid, possibly the most significant chemical produced by western civilizations, uses the majority of sulfur, though.Sulfur is not hazardous to humans at all. A burning sensation or diarrhea could, however, result from consuming too much sulfur. Inhaling sulfur dust may aggravate the airways or result in coughing. Additionally, it might irritate your skin and eyes.To learn more about sulfur, refer to:
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How many moles are in 202.33 grams of sulfuric acid
Answer:
8?
Explanation:
If the normal, undisturbed position of the wave is at 0 on the diagram below, what is the amplitude of Wave A?
20 m
40 m
10 m
5 m
5m is the amplitude of Wave A.
What is amplitude ?
A wave's amplitude is the separation between its starting point and its maximum displacement. Frequency is the quantity of waves traveling by a certain place each second. Period is the amount of time it takes for one wave cycle to finish.
What is wave ?
An energy-conducting disturbance in a medium known as a wave is one that does not involve any net particle motion. It could manifest as elasto-deformation, a shift in pressure, electric or magnetic intensity, electric potential, or temperature.
Therefore, 5m is the amplitude of Wave A.
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draw the structural formula(s) for the organic product(s) formed when the following compound is heated at reflux in an excess of concentrated .
1,3 diiodo propane is formed when oxetane is heated at reflux.
Reflux is defined as the process which involves heating the chemical reaction for a specific amount of time, while continually cooling the vapor produced back into liquid form, using a condenser. The vapors that are produced above the reaction continually undergo condensation, returning to the flask as a condensate.
Oxetane is a stable carbon compound which shows characteristic properties when reacted with conc. acids. When oxetane reacts with HI it gets reduced to form 1,3 diiodo propane which is also an organic compound.
Therefore, when oxetane is heated in excess amount of concentrated HI, the product formed is 1,3 diiodo propane.
The reaction is given in the image attached below.
The given question is incomplete and the completed question is given below.
Draw the structural formula(s) for the organic product(s) formed when the following compound (OXETANE) is heated at reflux in an excess of concentrated (HI) .
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nitrogen and phosphorous bonding patterns: build each of the indicated molecules below in the simulator and match them to the correct bonding pattern in respect to either nitrogen or phosphorus. remember if a molecule does not have a name when you build it is not a stable arrangement and you might have to reorder your atoms. how do nitrogen and phosphorus tend to bond in compounds? what patterns do you see? how many total covalent bonds do nitrogen and phosphorus atoms tend to form? group of answer choices n2 [ choose ] nh3 [ choose ] nh2cl [ choose ] no [ choose ] hno [ choose ] hcn [ choose ]hps [ choose ] ph3 [ choose ]
In compounds, nitrogen and phosphorus frequently form covalent bonds to produce bonds. The valence electrons on nitrogen and phosphorus atoms determine how many total covalent bonds they typically form. While phosphorus can make three or five covalent bonds, nitrogen normally only forms three.
What is called nitrogen?Nitrogen (N), a nonmetallic element belonging to Periodic Table Group 15 [Va]. It is a colorless, flavorless, and odorless gas that makes up the majority of the atmosphere on Earth and is a component of all living things. Nitrogen is a chemical element with the symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest element in the pnictogens, group 15 of the periodic table. It is a common element in the universe and is thought to be the eighth most abundant element overall in the Milky Way and the Solar System.
What is source of nitrogen?The primary source of nitrogen for atmospheric deposition is the combustion on fossil fuels like coal and oil. Nitrogen may be deposited in the atmosphere as dry particulates, gases, or droplets or as a wet form such as rainfall, snow, hail, fog, or freezing rain. Nitrogen primarily comes from the atmosphere. It is made comprised of this harmless, colorless gas in 78 percent of its composition.
N2: triple bond; three covalent bonds are being formed by nitrogen.
NH3: three single bonds, three covalent bonds being formed by nitrogen.
NH2Cl: nitrogen is making three covalent bonds, two of which are single bonds and one is a double bond.
NO: Nitrogen is making two covalent bonds, one single bond and one double bond.
HNO: nitrogen is making two covalent bonds, one single and one double.
HCN: three covalent bonds are being formed by nitrogen, including one single bond and one triple bond.
HPS: phosphorus is making three covalent bonds, one single bond, two double bonds, and one single bond.
PH3: phosphorus is creating three covalent bonds from three single bonds.
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Determine the mechanism and product for the given reaction by adding atoms, bonds, nonbonding electron pairs, and curved arrows. Acid and water are added in the second step.
−→−−−−−−−−−−CH3CH2MgBrProduct
The final product is 1-butanol.
The given reaction is the addition of a Grignard reagent, CH₃CH₂MgBr, to a carbonyl compound.
The mechanism for the reaction is a nucleophilic addition. The mechanism can be broken down into three main steps:
Step 1: Nucleophilic attack
The carbon atom in the carbonyl group has a partial positive charge, making it an electrophile. The carbon atom in the Grignard reagent has a partial negative charge, making it a nucleophile. The nucleophilic carbon attacks the electrophilic carbon of the carbonyl group, forming a tetrahedral intermediate.
H
|
H₃C C O
|
CH₃
-
|
CH₃CH₂MgBr
Step 2: Protonation
The tetrahedral intermediate is unstable and collapses. In this step, an acid, such as H₃O⁺, protonates the oxygen atom, which forms an alcohol.
H
|
H₃C C OH
|
CH₃
-
|
CH3CH2MgBr + H3O+
Step 3: Deprotonation
In the final step, a base, such as water, removes a proton from the protonated alcohol to form the final product, which is a neutral alcohol.
H
|
H₃C C OH
|
CH₃
|
H
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A chemistry class is experimenting with iodine to see which common white powder items will react and make the iodine change color. Which item listed will have a chemical reaction with iodine?
A. baking soda
B. cornstarch
C. salt
D. powdered sugar
Answer:
B. Cornstarch
Explanation:
Iodine reacts with some substances and changes color as a result of the reaction. Out of the items listed:
B. Cornstarch will react with iodine and produce a blue-black color. This reaction is due to the presence of starch, which reacts with iodine to form a complex molecule called iodine starch.
A. Baking soda, also known as sodium bicarbonate, does not react with iodine and will not cause a color change.
C. Salt, also known as sodium chloride, does not react with iodine and will not cause a color change.
D. Powdered sugar, also known as sucrose, does not react with iodine and will not cause a color change.
An aqueous KNO3 solution is made using 70.5g of KNO3 diluted to a total solution volume of 1.97 L .
Calculate the molarity of the solution. (assume a density of 1.05 g/mL for the solution)
Calculate the molality of the solution.
Calculate the mass percent of the solution.
molar mass of KNO3 = 39.1 g/mol (K) + 14.0 g/mol (N) + 3x16.0 g/mol (O)
= 101.1 g/mol
moles of KNO3 = 70.5 g / 101.1 g/mol
= 0.697 mol
Next, calculate the volume of the solution in liters:volume of solution = mass of solution / density of solutionmass of solution = mass of KNO3 + mass of water
= 70.5 g + (1.97 L x 1.05 g/mL)
= 70.5 g + 2.067 g = 72.567 g
volume of solution = 72.567 g / 1.05 g/mL
= 69.105 L
Finally, calculate the molarity:Molarity = 0.697 mol / 69.105 L
= 0.0101 M
Molality:Molality = moles of solute / mass of solvent in kgAssuming the mass of the solute (KNO3) does not significantly affect the mass of the solution, we can use the same mass of solution as before:mass of solvent = mass of solution - mass of solute = 72.567 g - 70.5 g
= 2.067 g
Converting to kg:mass of solvent = 2.067 g / 1000 g/kg
= 0.002067 kg
Molality = 0.697 mol / 0.002067 kg
= 337.2 mol/kg
Mass percent:Mass percent = (mass of solute / mass of solution) x 100%mass of solute = 70.5 gmass of solution = 72.567 gMass percent = (70.5 g / 72.567 g) x 100%
= 97.16%
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in this experiment, you will be given approximately 1 gram each of acetanilide. draw the structure of the compound and describe the properties that make the solvent a good recrystallization solvent.
Acetanilide is an organic compound with the chemical formula C8H9NO. Its structure consists of a phenyl group attached to an amino group and a carbonyl group.
What is Recrystallization Solvent?
It involves dissolving a solid compound in a suitable solvent at high temperature, and then allowing it to cool down slowly to form pure crystals. The choice of solvent is crucial in the recrystallization process, as the solvent must be able to dissolve the solid compound at high temperature but not at low temperature, which would lead to the formation of pure crystals.
Acetanilide is a polar organic compound and is typically soluble in organic solvents such as hot ethanol, hot methanol, and hot water. These solvents are good recrystallization solvents for acetanilide because they can dissolve it at elevated temperatures, and upon cooling, the solubility of acetanilide decreases, leading to its precipitation and crystallization. The solvents are also able to dissolve impurities that might be present in the sample, so that the impurities remain in solution while the pure acetanilide crystals are formed upon cooling. Additionally, these solvents are relatively non-toxic, making them safe to use in a laboratory setting.
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When Ibuprofen is given for fever to children 6 months of age up to 2 years, the usual dose is 5 milligrams (mg) per kilogram (kg) of body weight when the fever is under 102.5 degrees Fahrenheit. How much medicine would be usual dose for a 18 month old weighing 19 pounds?
54.58g of Medicine would be usual dose for a 18 month old weighing 19 pounds.
How can we calculate about the dose to be given by using information?Here, given that usual dose for children of use between 6 month to 2 year fever, is 5 mg per kg body weight.
1 kg body weight require 5 mg dose of medicine. and are have to find out how much dose of medicine
Required for 18 month children whose weighing is 24 pounds.
So, first are convert all the data in milligram because answer is required in mg. we know that
1 pound = 0.454K2
1 kg= 100 mg
.: 24 pounds = 24X0. 454 x 100 mg
[ 1 pound = 0.454 K2 then 24 pound = 24×0.454k2. and 24x0.454g = 24×0.454 × 100 mg
Now, 10 mg body weight remise dose is 5 mg then 24x054xlos my body.
required dose of children of 18 month and weighing is 24X0.454x100 mg is = 24x0.454x100 x 5 106 = 54.48 mg.
Answer: 54.48 mg.
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PLS SOMONE HELP I KNOW THE PHOTO ISNT THAT GOOD BUT I REALLY NEED HELP I WILL MARK AS BRAINLIEST AND GIVE 5 STARS ASWELL AS A HEART PLSS IM BEGGING YOU
The statement that best explains why the chemical equation provided for combustion of methane supports law of conservation of mass is as follows: There is same number of each kind of atom before and after the chemical reaction and the total mass remains the same (option D).
What is law of conservation of mass?The law of conservation of mass is a conservation law that states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.
The law of conservation of mass further explains that in a chemical reaction, the amount of each atom on both sides of the equation is the same.
According to this question, methane gets combusted in air. To fulfill the law of conservation of mass, the same number of each kind of atom before and after the chemical reaction and the total mass remains the same.
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Consider the following compounds, all of which are soluble in water:
I: Glucose, C6H12O6
II: Potassium nitrate, KNO3
III: Glycerol, C3H8O3
IV: Acetic acid, HC2H3O2
V: Ammonium carbonate, (NH4)2CO3
Which of these compounds would you expect to behave as nonelectrolyte(s) in solution?
All the compounds given are soluble in water. The compounds that behave as nonelectrolyte(s) in solution are glucose and glycerol.
Nonelectrolytes are compounds that do not dissociate into ions in water and therefore do not conduct electricity.
Glucose (I) and glycerol (III) are both examples of nonelectrolytes. They are soluble in water but do not dissociate into ions, so they do not conduct electricity.
Potassium nitrate (II), acetic acid (IV), and ammonium carbonate (V) are all electrolytes, meaning they dissociate into ions in water and conduct electricity.
Therefore, the compounds that would behave as nonelectrolytes in solution are glucose (I) and glycerol (III) and all the given compounds are soluble in water.
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consider the molecule 1,3-dichloropropadiene. (a) list all the symmetry operations for the molecule.
The symmetry operations are, E (identity operation), C2 (rotation by 180 degrees about the carbon-carbon double bond), C2' (rotation by 180 degrees about the axis passing through both chlorine atoms), sigma_v (reflection through a plane perpendicular to the carbon-carbon double bond), sigma_v' (reflection through a plane perpendicular to the axis passing through both chlorine atoms), i (inversion through a point at the midpoint of the carbon-carbon double bond).
The molecule 1,3-dichloropropadiene has the chemical formula C3H2Cl2.
There are four atoms in the molecule, and each atom has a set of valence electrons that can be used to form chemical bonds. We can identify two C2 axes that pass through the carbon-carbon double bond, and one C2 axis that passes through both chlorine atoms. There are also two perpendicular planes of symmetry that bisect the molecule, one containing the carbon-carbon double bond and the other containing the two chlorine atoms.
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The particles shown represent a proposed two-step mechanism for the destruction of ozone (O3) in the upper atmosphere. Based on the proposed mechanism, which of the following is the rate law expression for the destruction of O3?
The rate law expression for the destruction of O3 based on the proposed two-step mechanism is: rate = k[O3][NO]
This expression is derived from the proposed mechanism by identifying the rate-determining step (the slow step) and using the concentrations of the reactants involved in that step.
In this case, the slow step is the reaction between O3 and NO to form NO2 and O2. Therefore, the rate law expression is based on the concentrations of O3 and NO, and the rate constant k.
It is important to note that the rate law expression does not include the concentrations of the other reactants or products involved in the mechanism, as they are not involved in the rate-determining step.
Overall, the rate law expression for the destruction of O3 in the upper atmosphere based on the proposed two-step mechanism is rate = k[O3][NO].
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