Answer:
i need help with this and the answer above is wrong
Explanation:
pls
A substance is followed by the symbol (1) in a chemical equation. What does the symbol represent?
Answer:
The symbol (l) stands for liquid phase.
Explanation:
A 2.7 M solution contains
0 2.7 moles of solute per 1000 g of solvent.
2.7 moles of solute per 1000 mL of solution.
0 2.7 grams of solute per 100 mL of solution.
0 2.7 grams of solute 100 g of solution.
per
Answer:
2.7 moles of solute per 1000 mL of solution.
Explanation:
Hello,
In this case, molarity is defined as the ratio of the moles of the solute to the volume of the solution in litres, thus, for a 2.7-M solution, it is clear that we have 2.7 moles of the solute in 1 L of solution, thus the option having the proper relation is 2.7 moles of solute per 1000 mL of solution as 1 L equals 1000 mL.
Best regards.
Determine the total kilojoules in two tablespoons of crunchy peanut butter that contains 6 g of carbohydrate, 11 g of fat, and 9 g of protein.
Answer:
665 kJ
Explanation:
We assume that carbohydrates and protein each have 4 kilocalories per gram, and that fat has 9 kilocalories per gram. Then the number of kilocalories in the peanut butter is ...
4(6 +9) +9(11) = 159 . . . . kilocalories
Each kilocalorie translates to 4.184 kilojoules, so the total is ...
(159 kCal)(4.184 kJ/kCal) = 665.256 kJ
2 Tbsp of crunchy peanut butter contains about 665 kJ of energy.
The number of kilojoules in two table spoons of crunchy peanut butter obtained by adding the amount of kilojoules in each food type is 673kJ
From the table given ; the amount of kilojoules per gram of each food type is :
Carbonhydrate __17Fat ___________38Protein ________17I gram of Carbonhydrate = 17 kJ
6 grams of Carbonhydrate = (6 × 17) = 102 kJ
I gram of Fat = 38 kJ
11 grams of Carbonhydrate = (11 × 38) = 418 kJ
I gram of Protein = 17 kJ
9 grams of Carbonhydrate = (9 × 17) = 153 kJ
Therefore, the total kilojoules present is (102 + 408 + 153)kJ = 673 kJ
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True or false. The kinetic energy of reactant particles has no effect on the reaction rate?
Answer:
false
Explanation:
How many grams of aluminum would have the same number of atoms as 6.94 g of lithium?
Answer:
26.984g =Al cantain 1.6023x10^27amu
6.94=li cantain 1.6023x10^27amu
thus
mass of aluminium/mass of lithium
26.984/6.94=3.89
For the reaction 2H₂(g) + O₂(g) → 2H₂O(g), what volume of water vapor can be made from 100 grams of oxygen gas and an excess of hydrogen at STP? Please show work.
Answer:
140 L
Explanation:
Step 1: Write the balanced equation
2 H₂(g) + O₂(g) → 2 H₂O(g)
Step 2: Calculate the moles corresponding to 100 g of oxygen
The molar mass of oxygen is 32.00 g/mol.
[tex]100g \times \frac{1mol}{32.00g} =3.13mol[/tex]
Step 3: Calculate the moles of water vapor formed
The molar ratio of oxygen to water vapor is 1:2.
[tex]3.13molO_2 \times \frac{2molH_2O}{1molO_2} =6.26molH_2O[/tex]
Step 4: Calculate the volume corresponding to 6.26 moles of water vapor
1 mole of any ideal gas under STP has a volume of 22.4 L.
[tex]6.26mol \times \frac{22.4L}{mol} =140 L[/tex]
In Universe L, recently discovered by an intrepid team of chemists who also happen to have studied interdimensional travel, quantum mechanics works just as it does in our universe, except that there are six d orbitals instead of the usual number we observe here.
Use these facts to write the ground-state electron configurations of the fifth and sixth elements in the first transition series in Universe L.
Note: you may use to stand for the electron configuration of the noble gas at the end of the row before the first transition series.
fifth transition metal:
sixth transition metal:
The electron configuration of the fifth and sixth transition elements in universe L may be slight different than as it is on earth.
The electron configuration shows the distribution of electrons in atoms. In atoms electrons are distributed in orbitals. Different orbitals hold different maximum number of electrons in them.
On earth, the d orbitals are five but in universe L, the d orbitals are six. This implies that d orbitals in universe L can hold a total of twelve electrons.
The fifth transition metal is Manganese. The electron configuration of manganese in universe L is [Ar] 3d6 4s1. The sixth transition element is iron. The electron configuration of iron in universe L is [Ar] 3d6 4s2.
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Toluene (C7H8) is a component of gasoline and it is contaminating a water body due to a leaky storage tank. The concentration in water of the toluene is 4.25ppm. The starting pH of the water is 3.0 and this is a completely un-buffered system (i.e. protons that are liberated remain in solution and protons that are consumed are lost from solution during the RXNs taking place). Fe(OH)3 is present and will serve as an electron acceptor for toluene oxidation; it is reduced to Fe2 . Toluene is oxidized to 3mol acetate (C2H3O2 - ) and 1mol CO2. How many mol protons are liberated/consumed in this reaction, and assuming no buffer, will the pH increase or decrease)
Answer:
In the given reaction "12 mol" of protons are consumed. The further explanation is given below.
Explanation:
Let's compose half of C₇H₈ on such controlled oxidation. For balance, firstly C is controlled, then O would be balanced that used H₂O after this H is balanced that used H⁺and after that change is balanced across each side through using e⁻ on the right.
The equation will be:
8H₂O+C₇H₈ ⇒ 3C₂H₃O₂⁻+CO₂+15H⁺+9e⁻ ...(equation 1)
⇒ e⁻+Fe(OH)₃ ⇒ Fe²⁺+3OH⁻
⇒ 3×(H⁺+OH⁻ ⇒ H₂O)
On adding both the above reactions, we get
⇒ e⁻+Fe(OH)₃+3H⁺ ⇒ Fe²⁺+3H₂O ...(equation 2)
Now,
On multiplying "9" into "equation 2" and adding it on "equation 1", we get
⇒ 8H₂O+C₇H₈+9e⁻+9Fe(OH)₃+27H⁺ ⇒ 9Fe²⁺+27H₂O+CO₂+15H⁺+9e⁻
On canceling the common terms from both sides of the reaction, we get
⇒ C₇H₈+9Fe(OH)₃+12H⁺ ⇒ 9Fe²⁺+19H₂O+CO₂ ...(equation 3)
The above "equation 3" seems to be the overall Redox reaction.
Throughout this reaction, 12 mol of a proton (H⁺) is absorbed. Because H+ is absorbed, pH would also increase.
A chemistry journal requires that all new research papers be peer reviewed by other scientists before they are published. This
allows which of the following?
The reviewers can determine the experiment's feasibility
The reviewers can determine the experiment's validity
The reviewers can include their own findings with the research.
The reviewers can determine if they will help fund the research.
Answer:
I think its number 2
Explanation:
At certain times during the process, the temperature increased. During these times, the heat that was absorbed took the form of energy in the water molecules. This process caused the molecules to .
At other times during the process, the temperature didn’t increase. During these times, the heat that was absorbed took the form of energy in the water molecules. This process caused the water molecules to .
Answer: kinetic, move faster, potential, change form
Explanation:
Answer: kinetic, move faster, potential, change state
Explanation: Edmentum
Circle the functional groups and I need help naming 7) and 10)
Answer:
The answer to your question is given below.
Explanation:
1. The functional group is alkanol or alcohol (R–OH).
2. The functional group is alkanone or ketone (RC=OR).
3. The functional group is alkanal or aldehyde (R–CHO)
4. The functional group is alkanoic or carboxylic acidic (R–COOH).
5. The functional group is ether (ROR)
6. The functional group is ester (RCOOR).
7. The functional group is alkanol or alcohol (R–OH).
8. The functional group is alkanoic or carboxylic acidic (R–COOH).
9. The functional group is alkanal or aldehyde (R–CHO).
10. The functional group is alkanone or ketone (RC=OR).
Naming of the compound
To name the above compound, we must do the following:
1. Locate the longest continuous carbon chain. This gives the parent name.
2. Identify the functional group.
3. Identify and locate the position of the substituent group attached if there are any.
4. Combine the above to obtain name of the compound.
Now, let us name compound 7 and 10.
7a. The longest carbon chain is 4 i.e butane.
b. The functional group is –OH i.e alkanol or alcohol. We'll replace the –e in butane with –ol to obtain the name.
Therefore, the name of the compound is butanol.
10a. The longest carbon chain is 4 i.e butane.
b. The functional group is RC=OR i.e alkanone or ketone. We'll replace the –e in butane with –one to obtain the name.
Therefore, the name of the compound is butanone.
what is the sex-ratio in rajasthan according to 2011 census?
Answer:
Sex ratio of India according 2011 census is 940 females per 1000 males. Sex ratio of Rajasthan is 928 which means there are 928 female present per 1000 males
Explanation:
pls check my answer brain list
a. In terms of air molecules, explain what gives a balloon its shape when air is blown into it.
b. Why does it stop expanding when you stop blowing air into it?
Answer:
A. This is because the pressure of the gas is the force that the gas exerts on the walls of its container. The force gives the balloon the shape when the air is blown into it.
B.When air is blown into a balloon, the balloon expands because the pressure of air molecules is greater on the inside of the balloon than the outside. When blowing of air is stopped, the gases in the balloon remain constant and so does its shape.
Plants need sunlight, water, and minerals from the soil in order to grow and thrive. These factors
A.
are always abundant, allowing unlimited growth.
B.
limit the number of plant populations that can grow in an ecosystem.
C.
require human intervention to be replenished.
D.
prevent new plant populations from entering the ecosystem.
Answer:
B. limit the number of plant populations that can grow an ecosystem
Answer:
B. limit the number of plant populations that can grow in an ecosystem.
Explanation:
What happens when you put magnesium carbonate and diluted water
Answer:
Magnesium carbonate doesn't dissolve in water, only acid, where it will effervesce (bubble).
Explanation:
An insoluble metal carbonate reacts with a dilute acid to form a soluble salt. Magnesium carbonate, a white solid, and dilute sulfuric acid react to produce magnesium sulfate. Colourless magnesium sulfate heptahydrate crystals are obtained from this solution.
Are all acids dangerous? Give at least two examples to show what you mean.
Answer:
Laboratory acids are far too dangerous to taste, but you will have swallowed some dilute weak acids. Acids have a sour taste, like vinegar, which contains ethanoic acid, and lemons, which contain citric acid. These are safe to use in food, but they can still hurt if they get into a cut or into your eyes.
Explanation:
They can safely be consumed and do not irritate the skin. However, at greater concentrations weak acids can be harmful. Acids can react violently with water and are harmful in the presence of moisture in the mouth or eyes or in proximity with other aqueous solutions.
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Which of the following is an example of acceleration? 88m/s, 15km/hr,14m/s East, 9.8 m/s^2 south
Answer: The answer is 9.8 m/s^2 south
Explanation:
A geochemist in the field takes a 34.0 mL sample of water from a rock pool lined with crystals of a certain mineral compound X. He notes the temperature of the pool, 22.0 °C, and caps the sample carefully. Back in the lab, the geochemist first dilutes the sample with distilled water to 750.0 mL. Then he filters it and evaporates all the water under vacuum. Crystals of X are left behind. The researcher washes, dries, and weighs the crystals. They weigh 0.31 g.
Using only the information above, can you calculate yes the solubility of X in the water at 17.0 °C? If yes, calculate it. Be sure your answer has a unit symbol and 3 significant digits.
Answer:
The solubility is [tex]S = 0.00912 \ g/mL[/tex]
Explanation:
From the question we are told that
The original volume of sample is [tex]V_o = 34.0 mL = 34 *10^{-3} \ L[/tex]
The temperature is [tex]T = 22.0 ^oC[/tex]
The new volume of sample is [tex]V_n = 750.0 mL = 750 *10^{-3} \ L[/tex]
The weight of the crystal is [tex]X = 0.31 \ g = 0.31 *10^{-3} \ kg[/tex]
Now looking at the question we see that 34.0 mL of the sample is saturated with 0.31g of the crystal X
Generally the solubility of X in the water sample at [tex]22.0 ^oC[/tex] can be mathematically evaluate as
[tex]S = \frac{0.31 }{34.0}[/tex]
[tex]S = 0.00912 \ g/mL[/tex]
It is expected that US forests will
Answer:
be able to meet long term timber needs.
Explanation:
Forest Services has been indicated for a long time the exhaustion of timer in the United States. However, in the recent decade, this trend has shown a reverse. The creation of nuclear energy and other technological developments that bring about drastic changes in our way of life. Gradually, the forest has recovered its trees and plants, and it is anticipated that timber will be available to meet long-term wood needs.
One of the most desirable of the old British sports cars was the beautiful Triumph Vitesse (1963-1971). Pictured below is the American version, called the Sports 6. A little expensive back in the day, only 679 were sold. Imagine you are on vacation, and for fun you and your companion select a cool, beautiful day in Gansu Province and ride the G30 highway from Lanzhou to the Mogao caves in Dunhuang, about distance of 686 miles. If you consume gasoline according to:
2 C8H18(l) + 25 O2(g)? 16 CO2(g) + 18 H2O(g)what volume of carbon dioxide gas would be produced by this motoring trip if your fuel consumption was 21.2 miles per gallon? Note that the density of gasoline is 0.805g/cm3, and one mole of any gas at 760 mmHg and 0oC is 22.4 L.
Answer:
[tex]V_{CO_2}=1.55x10^{5}LCO_2=155m^3CO_2[/tex]
Explanation:
Hello,
In this case, given the reaction:
[tex]2 C_8H_{18}(l) + 25 O_2(g)\rightarrow 16 CO_2(g) + 18 H_2O(g)[/tex]
The total consumed gallons are computed by considering 686 miles were driven and the consumption is 21.2 miles per gallon, thus:
[tex]V_{C_8H_{18}}=686miles*\frac{1gal}{21.2miles} =32.4gal[/tex]
Hence, with the given density, one could compute the consumed grams and consequently moles of gasoline as well as moles that were consumed:
[tex]n_{C_8H_{18}}=32.4gal*\frac{3785.41cm^3}{1gal} *\frac{0.805g}{1cm^3} *\frac{1mol}{114g}=864.95mol C_8H_{18}[/tex]
Next, since gasoline (molar mass = 114 is in a 2:16 molar relationship with the yielded carbon dioxide, we compute its produced moles as shown below:
[tex]n_{CO_2}=864.95mol C_8H_{18}*\frac{16molCO_2}{2molC_8H_{18}} =6919.6molCO_2[/tex]
Finally, we could assume the given STP conditions to compute the volume of carbon dioxide, as no more information regarding the space wherein the carbon dioxide is available:
[tex]V_{CO_2}=\frac{n_{CO_2}RT}{P} =\frac{6919.6mol*0.082\frac{atm*L}{mol*K}*(0+273)K}{1atm} \\\\V_{CO_2}=1.55x10^{5}LCO_2=155m^3CO_2[/tex]
Best regards.
Please Help Me!!
1. What does the expression “metals eating each other” as used by the electrician refer to? Explain and give an example.
2. What are the possible electrolytes in the rusted panel?
3. Using the table for electrode potential differences (Figure 2) identify the possible composition of the screws responsible for the corrosion observed in the contact area with the copper wire.
Answer:
1. Galvanic oxidation. Example is the corrosion of aluminium wires when in contact with copper wires under wet conditions.
2. Rainwater or Damp/moist air
3. Chromium-plated steel screws or stainless steel screws or galvanized steel screws
Explanation:
1. Galvanic oxidation or corrosion occurs when two different metals with different electrode potentials are brought into contact with each other by means of an electrolyte (usually a aqueous solution), such that a redox reaction occurs leading to one metal with the more negative electrode potential (the anode) becoming oxidized, while the other less negative potential (the cathode) is reduced.
In order for galvanic corrosion to occur, three elements are required.
i. Two metals with different corrosion potentials (anode and cathode)
ii. Direct metal-to-metal electrical contact
iii. A conductive electrolyte solution (e.g. water) must connect the two metals on a regular basis.
For example oxidation (corrosion) of aluminium wires when in contact with copper wire under wet conditions.
2. The most likely electrolyte will be rainwater containing dissoved solutes (if the panel is in an exposed part of the house) or damp/moist air.
3. From the table, the most likely screw will be chromium-plated steel screws or stainless steel (made of iron and nickel) screws or galvanized steel (zinc-plated) screws.
All these possible screw components have a more negative electrode potential than copper. Thus they will serve as the anode in a galvanic oxidation with copper.
Sunlight Grass → Rabbit + Snake
What is the abiotic factor in this food chain?
Sunlight
Grass
Rabbit
Snake
Answer:
The abiotic factor is Sunlight.
1 point
A container with nitrogen, oxygen, and hydrogen has a pressure of 10.46
atm. If the pressure of nitrogen is 321 kPa and the pressure of oxygen is
74.0 psi, what is the pressure of hydrogen? *
2.25 atm
18.7 atm
4.90 atm
237 atm
Answer:
2.25 atm
Explanation:
Given data
Pressure of N₂: 321 kPaPressure of O₂: 74.0 psiPressure of H₂: ?Total pressure: 10.46 atmStep 1: Convert the pressure of nitrogen to atm
We will use the relationship 1 atm = 101.325 kPa.
[tex]321kPa \times \frac{1atm}{101.325kPa} = 3.17 atm[/tex]
Step 2: Convert the pressure of oxygen to atm
We will use the relationship 1 atm = 14.6959 psi.
[tex]74.0psi \times \frac{1atm}{14.6959psi} =5.04atm[/tex]
Step 3: Calculate the partial pressure of hydrogen
The total pressure is the sum of the partial pressures.
P = pN₂ + pO₂ + pH₂
pH₂ = P - pN₂ - pO₂
pH₂ = 10.46 atm - 3.17 atm - 5.04 atm
pH₂ = 2.25 atm
Answer:
[tex]P_H=2.25atm[/tex]
Explanation:
Hello,
IN this case, we can apply the Dalton's law in order to understand the pressure behavior of a mixture as the summation of all the pressures of the compounds in the mixture, in this case, nitrogen, oxygen and hydrogen:
[tex]P_T=P_O+P_N+P_H[/tex]
So, since we are asked to compute the pressure of hydrogen, we simply solve for it:
[tex]P_H=P_T-P_O-P_N=10.46atm-74.0psi*\frac{1atm}{14.6959psi} -321kPa*\frac{1atm}{101.325kPa} \\\\P_H=2.25atm[/tex]
Best regards.
What is the function of the structure labeled A?
It pumps blood over the internal organs.
It aids in crawling, digging, and feeding.
It forms the outer wall of the animal's body.
It delivers oxygen to the blood.
Answer:
Answer is present in the explanation.
Explanation:
If the labeled A has structure of heart so we can say that it pumps blood to all the internal organs of the body. If the labeled A shows the structure of foot of any organism so we can say that it aids in crawling, digging in the soil and capturing the food for itself. If the labeled A indicates the structure of epithelial tissue so we can say that it forms the outer wall of the animal's body. If the labeled A shows the structure of hemoglobin cell so we can choose that it delivers oxygen to the blood.
Answer:
D) It delivers oxygen to the blood.
Explanation:
It's on Edge 2020
Why would scientists use a control sample that is known to be from a
specific species in an eDNA surveillance for that species?
A. So they can have a negative control against samples
B. So they can cut sample DNA into fragments
C. So they can amplify the DNA in small samples
D. So they can identify samples that contain the target DNA
Answer:
Here is the answer...
Explanation:
Option A is used to control sample that is known to be form.
Can I get help on this ASAP please!
Answer:
Option A.
Explanation:
To know which structure is correct, let us name both compound.
In naming the above organic compound, the following must be observed:
1. Locate the functional group. In this case it alkene since it has carbon to carbon double bond (C=C).
2. Locate the longest continuous carbon chain. In this case the compound is a cyclic compound with 6 carbon i.e cyclohexene.
3. Locate the substituents attached to the compound. In this case, bromine (bromo) and chlorine (chloro) are the substituents attached.
4. Locate the position of the substituents and name alphabetically counting from the double bond. In this case, bromo comes before chloro
5. Combine the above to get the name.
For option A, the name is:
4–bromo–5–chlorocyclohexene.
For option B, the name is:
3–bromo–4–chlorocyclohexene.
We can see that Option A gives the correct structure of the compound.
if a reaction starts with 0.480 mol Mg how many moles of silver are produced
Mg + 2AgNO3 --> Mg(NO3) + 2Ag
The moles of silver (Ag) produced by 0.480 mol Mg has been 0.96 mol.
The balanced chemical equation has been given as:
[tex]\rm Mg\;+\;2\;AgNO_3\;\rightarrow\;Mg(NO_3)\;+\;2\;Ag[/tex]
The stoichiometric coefficient in the balanced chemical equation has been the representation of whole number ratio of moles of each reactant required to form the product.
From the given balanced equation, 1 mole of Mg produces 2 mol of Ag. The moles of Ag produced from 0.480 mol Mg has been:
[tex]\rm 1\;mol\;Mg=2\;mol\;Ag\\0.480\;mol\;Mg=\;0.480\;\times\;2\;mol\;Ag\\0.480\;mol\;Mg=0.96\;mol\;Ag[/tex]
The moles of silver (Ag) produced by 0.480 mol Mg has been 0.96 mol.
For more information about moles of reaction, refer to the link:
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Which location would be best for solar energy
Answer:
An area that has a lot of sun-light!
Explanation:
You are asked to analyze an aqueous solution (X) and determine what's in it. You pour some of your sample X into a test tube and add a few drops of an acid. No observable reaction occurs. Then you add a few drops of barium chloride solution to your mixture (containing an aqueous solution X and the acid), a white precipitate forms.
1. What can you conclude about the solution X, based on this experiment?
(Circle as many choices as applies.)
A. Solution X must contain a covalent (molecular) compound.
B. Solution X does not react with barium chloride.
C. This experiment is inconclusive, and does not provide any information about the contents of X.
D. Solution X must contain sulfate ion.
E. Solution X does not contains any ionic compound.
F. The solution X contains an ionic compound.
Answer:
b. Use an AD/AS diagram to show how a decrease in the inflation target can keep inflation and short-run output from starting to rise in 2021. Explain your diagram and what it reveals about monetary policy.
Three examples of chemical reactions ????? PLEASE HELP
Answer:
Photosynthesis, Respiration, Combustion, Anaerobic Respiration
Explanation:
Im not 100% sure if this is what you are looking for but it should be correct. Hope this helps! :)