The neutral atoms of all of the isotopes of the same element have:
C) the same number of electrons
Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei, but the same number of protons. This means that isotopes have the same atomic number, which determines the element to which they belong, but different mass numbers.
The other answers are incorrect for the following reasons.
a. This is incorrect because all atoms of the same element have the same number of protons.
b. This is incorrect because isotopes of the same element have different numbers of neutrons. The definition of isotopes is atoms of the same element having different numbers of neutrons.
c. This is incorrect because the mass numbers of the different isotopes will differ. The mass number is the sum of the protons and neutrons in the nucleus of an atom. Since isotopes of the same element have different numbers of neutrons, the mass numbers will differ.
d. This is incorrect because the mass of the different isotopes will differ. Neutrons have mass. Therefore, atoms that have different numbers of neutrons will have different masses.
Therefore, The neutral atoms of all of the isotopes of the same element have:
C) the same number of electrons
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in which reaction is h2o considered to be acting as an acid?
If water (H2O) gives a proton (H+) to another molecule, it is seen as functioning as an acid in the process.
The proton-accepting molecule is referred to as the base in an acid-base reaction, which is what this reaction is.
For instance, when water and ammonia (NH3) mix, water can give ammonia a proton, resulting in the formation of the hydronium ion (H3O+) and the ammonium ion (NH4+):
NH3 + H2O -> H3O + NH4 +
Ammonia, which is acting as a base and accepting a proton, is receiving a proton from water, which is functioning as an acid in this reaction.
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what is the ph of a solution that has [h3o ] = 1.39 x 10-2 m?
The pH of the solution that the concentration of [H₃O⁺] 1.39 × 10⁻² M is the 1.85 .
The concentration of [H₃O⁺] = 1.39 × 10⁻² M
The pH expression is as follows :
pH = - log [H₃O⁺]
where, the concentration of [H₃O⁺] = 1.39 × 10⁻² M
By solving the values , we get :
pH = - log [H₃O⁺]
pH = - log ( 1.39 × 10⁻² )
pH = - log ( 1.39 ) + - log 10⁻²
pH = - 0.143 + 2
pH = 1.85
Thus, the pH of the solution is 1.85 with the concentration of [H₃O⁺] is 1.39 × 10⁻² M.
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The boxes below represent areas filled with the same gas at two different temperatures. T= 18°C T = 45°C a. Draw a model of particles of the gas in each box. Then draw arrows to indicate the velocities of the particles. (1 point) b. Write two or three sentences relating the temperature, the average kinetic energy, and the motion of the particles. (2 points)
The average velocity of the gas on 18° C is [tex]\sqrt{\frac{8 \ R \ 18}{\pi \ M} }[/tex].
The average velocity of the gas on 45° C is [tex]\sqrt{\frac{8 \ R \ 45}{\pi \ M} }[/tex]
The average velocity of gas = [tex]\sqrt{\frac{8 \ RT}{\pi \ M} }[/tex]
R= gas constant
M= molecular mass of gas
T= temperature
Average Kinetic energy increases with the temperature. The velocity of the molecules also increases. Different molecules are moving with different speeds so we take the average of the motion of particles.
Average Kinetic energy = [tex]\frac{3}{2} K \ T[/tex]
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Which hydroxides are strong bases?Sr(OH)2KOHNaOHBa(OH)2A) KOH, Ba(OH)2B) KOH, NaOHC) KOH, NaOH, Ba(OH)2D) Sr(OH)2, KOH, NaOH, Ba(OH)2E) None of these is a strong base.
The hydroxides that are the strong base : NaOH, KOH, Sr(OH)₂, Ba(OH)₂ all are the hydroxides are the strong bases.
The hydroxide are as follows :
1) NaOH,
2) KOH,
3) Sr(OH)₂,
4) Ba(OH)₂
The all the hydroxides mentioned above is the strong bases. The all the hydroxide are belongs to 1 group and 2 group. The strong base ia the base that will completely dissociates in the aqueous solution. The bases are the substances that when dissolves in to the water will completely dissociates and produces the more hydroxide ion (OH⁻). The weak bases will only partially dissociates when dissolve in the water.
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hydroxide is not a suitable base for deprotonating an alkyne, why? use pka values to support your answer.
Hydroxide is not a suitable base for deprotonating an alkyne because it is a weak base.
Due to the acetylide ion's lower stability (stronger base) compared to the hydroxide ion. In other words, acetylene cannot be deprotonated using hydroxide.
Deprotonation is the process of eliminating the compound's most acidic proton using a base that you must select. We refer to it as a base because, according to the Bronsted-Lowry definition, the proton donor in an acid-base reaction is the given chemical if it is deprotonated, which makes it a base.
The terminal alkynes can be deprotonated by suitable strong bases, such as NaH or NaNH2, due to the relative high acidity.
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Coral and algae demonstrate mutualism, a symbiotic relationship where both organisms benefit. Select the option that is also an example of a mutualistic symbiotic relationship.
Cattle egrets follow livestock herds. As the livestock walk, they stir up insects in the grass, and the cattle egrets feed on the insects
Remoras hitchhike on large fish and sharks, eating dead skin and parasites off the larger animals
Wasps lay eggs on tomato hom worms to develop When the larvae hatch, they feed on the horn worms
Clownfish live inside anemones, protected from predators by the anemones' stinging tentacles
Clownfish live inside anemones, protected from predators by the anemones' stinging tentacles.
Clownfish and sea anemones are a classic example of a mutualistic symbiotic relationship. The relationship between these two species is mutually beneficial, with each species providing benefits to the other.
Key points:
Protection: Clownfish are protected from predators by the stinging tentacles of the sea anemone. This is because the tentacles contain toxins that deter predators, but clownfish are immune to the toxins, allowing them to reside safely within the anemone.Nutrients: Clownfish provide the anemone with food in the form of waste and uneaten bits of food. This waste provides the anemone with essential nutrients, helping it to thrive.Shelter: The anemone provides the clownfish with a safe and secure place to live and lay eggs. Clownfish are able to retreat into the anemone whenever they feel threatened.Mutual Defense: The presence of clownfish can also protect the anemone from potential predators. Clownfish will use their bodies to block the entrance to the anemone, preventing predators from getting close.Learn more about the mutualistic symbiotic relationships here:
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What does hypo and hyper mean in medical terms?
Hyper = above normal. Hypo = below, less than normal.
What are compounds ?
A compound is a substance consisting of two or more elements chemically combined in a fixed ratio. They differ from mixtures consisting of two or more substances physically mixed without chemical bonding. Compounds have their own physical and chemical properties that differ from those of individual elements. For example, the compound water (H2O) has different properties (boiling point, density, solubility, etc.) than its components hydrogen (H2) and oxygen (O2).
Compounds are formed by chemical reactions in which atoms of different elements combine to form new substances. The formation of a compound can be represented by a chemical formula that indicates the type and number of atoms in the compound.
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what property of a solution is described by its ph?
The property of the solution is described by the pH is the Acid - Base property.
The pH of the solution is the measure of hydrogen ion concentration in the solution. The pH of the solution describes the acid nature and the basic nature of the solution. The pH scale ranges from the 0 to 14 .
If the pH of the solution is blow the value 7 , it means that the solution is acidic in nature. If the pH of the solution is above 7 than the solution is basic in nature. Th pH value 7 is for neutral solution.
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How, many stereoisomers of the 2, .3-dimethylbutane are possible?
4
None 2 3
The 2,3-dimethylbutane structure is as follows: There are no chiral centers in the specified structure. Additionally, the supplied molecule has a plane of symmetry that often eliminates stereoisomerism. As a result, there are no stereoisomers.
In contrast to atomic connection, stereoisomers differ in the spatial arrangement of their atoms. The mirror-image stereoisomers, a non-superimposable pair of two molecules that are mirror images of one another, are one of their most intriguing types of isomers.
What are stereoisomers exactly?
Stereoisomers are isomers with the same composition (i.e., similar parts), but different orientations in space, according to a general description.
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There are two different compounds with the molecular formula c2h6o. One of this has a much higher boiling point than the other. Write the name of the compound with the lower boiling point.
Ethanol and methoxymethane are the two significant isomers of the chemical C2H6O. (or dimethyl ether). Beverages like ethanol possess functional groups called OH or hydroxyl groups. Methoxymethane is an ether, and the R-O-R' ether bond functions as the functional group.
The grouping 6A elements (oxygen, arsenic, selenium, and tellurium) produce more strongly polar hydrides even though they possess two free electrons for bonding. As a result, the fluid's intermolecular attraction is stronger, raising its boiling point. Water has the greatest boiling point between all materials owing because of its remarkable irregular shape and strong electronegative energy.
The chemical element with the lowest boiling is hydrogen, whereas the one with the highest boiling temperature is tungsten. Of all the elements, helium has the highest boiling point.
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calculate the pH at which the side-chain amino group of lysine is 20% dissociated.
The pH at which the side-chain of amino group of the lysine is 20% dissociated is 11.3.
The percentage dissociation = 20 %
α = √ Ka/ c
Where,
Ka = dissociation constant
c = concentration
c =8.16 / 0.04
= 2.04 × 10² M
After the dissociation , we get :
[Lys⁺] = [OH⁻]
= cα
[Lys⁺] = ( 2.04 × 10²) (0.20)
= 4.08 × 10² M
The pH expression is as follows :
pH = - log [H⁺]
= - log (Kw / [OH⁻])
= - log (2.54 × 10¹¹)
= 11.3
Thus, the pH is 11.3 at side chain amino group of the lysine that is 20 % dissociated.
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It takes 2 cups of water to cook 1 cup of rice. Clearcheck how much rice can you cook with 0. 5 cups of water? cups of rice how much water does it take to cook 6. 5 cups of rice? cups of water.
From the given ratio, it takes 2 cups of water to cook 1 cup of rice;
one can cook 0.25 cups of rice with 0.5 cups of waterit will require 13 cups of water to cook 6.5 cups of riceWhat are ratios?Mathematicians use the term "ratio" to compare two or more numbers. It serves as a comparison tool to show how big or tiny an amount is in relation to another.
Considering the given ratio in order to determine the cups of water required to cook any given cups of rice:
It takes 2 cups of water to cook 1 cup of rice
The ratio of cups of water to cups of rice is 2 : 1
The cups of rice that can you cook with 0. 5 cups of water is 0.5 * 1/2 = 0.25 cups of rice.
The cups of water that it will take to cook 6. 5 cups of rice is 6.5 * 2 = 13 cups of water.
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identify the hybridization of valence orbitals of the carbon atom in compound x
The hybridization of the carbon atom's valence orbitals cannot be ascertained without knowing more about the chemical "x." In order to calculate the number of bonds and the molecular shape of the molecule,
To create a hybrid, two or more distinct species, breeds, or types of plants or animals must be crossed. This can be accomplished either by artificial crossbreeding in the wild or controlled breeding in agriculture. The child may exhibit qualities from both parents, resulting in a blend of traits that may be advantageous or enhanced in some way. Through the gradual accumulation of genetic alterations over time, hybridization can potentially result in the emergence of new species. The bonding configuration between atoms in a molecule, which defines its shape and reactivity, is referred to as hybridization in chemistry.
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The Pressure P Of A Sample Of Oxygen Gas That Is Compressed At A Constant Temperature Is Related To The Volume V Of Gas By A Reciprocal Function Of The Form P = K/V. (A) A Sample Of Oxygen Gas That Occupies 0.671 M³ Exerts A Pressure Of 39 KPa At A Temperature Of 293 K (Absolute Temperature Measured On The Kelvin Scale). Find The Value Of K In The
The pressure P of a sample of oxygen gas that is compressed at a constant temperature is related to the volume V of gas by a reciprocal function of the form P = k/V.
(a) A sample of oxygen gas that occupies 0.671 m³ exerts a pressure of 39 kPa at a temperature of 293 K (absolute temperature measured on the Kelvin scale). Find the value of k in the given model.
(b) If the sample expands to a volume of 0.916 m³, find the new pressure.
(a) To find the value of k in the given model, use the given values of P and V:
P = 39 kPa = 39 * 10^3 Pa
V = 0.671 m³ = 0.671 * 10^3 L
P = k/V
k = PV = 39 * 10^3 * 0.671 * 10^3 = 26,049,000
(b) To find the new pressure, use the value of k and the new volume:
V = 0.916 m³ = 0.916 * 10^3 L
P = k/V = 26,049,000 / (0.916 * 10^3) = 28,538.56 Pa = 28.54 kPa.
Pressure is a physical quantity that describes the force per unit area exerted by a substance, such as a gas, liquid, or solid, on a surface that is in contact with it. It is commonly expressed in units of pascals (Pa), atmospheres (atm), or kilopascals (kPa). Pressure is a crucial concept in many fields, including physics, engineering, and medicine, and plays a critical role in various processes, such as combustion, fluid flow, and thermodynamics.
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in order to move a negative charge farther away from a positive charge, then you need
In order to move a negative charge farther away from a positive charge, then you need to apply a force in the direction away from the positive charge.
Coulomb's law states that the force between two point charges is directly proportional to the magnitude of the charges and inversely proportional to the square of the distance between them. The force between charges of opposite sign is attractive, while the force between charges of the same sign is repulsive.
Therefore, to move a negative charge farther away from a positive charge, a force must be applied in the direction away from the positive charge. This is because the force of attraction between the two charges acts to pull the negative charge towards the positive charge, and this force must be overcome in order to move the negative charge away. The magnitude of the force required will depend on the magnitude of the charges and the distance between them.
In general, moving charges in electric and magnetic fields requires the application of forces, and the direction and magnitude of these forces can be predicted using Coulomb's law and other laws of electromagnetism. Understanding these forces is important in many areas of science and technology, including electronics, electrical engineering, and particle physics.
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What is the route that electricity takes to reach your homes?
Answer:
from power stations, through transmission lines and distribution lines
Explanation:
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What is the trend in ionization energy as you go down a group?
answer choices
a. Down the group Ionization energy increases because atomic radius decreases.
b. Down the group Ionization energy decreases because atomic radius decreases.
c. Down the group Ionization energy decreases because atomic radius increases.
d. Down the group Ionization energy increases because atomic radius increases.
The trend in ionization energies as you go down a group is C. Going down the group Ionization energies decrease as the atomic radius increase.
Definition of Ionization EnergyIonization energy is the energy required to remove an electron from a neutral atom in gaseous form. Also as with the atomic radius, the periodicity of this one element also has the following tendencies:
In a group from top to bottom, the ionization energy of an element decreases because the atomic radius increases, so that the attraction of the nucleus to the outermost electrons becomes weaker and the ionization energy decreases.
In one period, the ionization energy of the elements increases from left to right because the atomic radius is getting smaller, so that the attraction of the nucleus to the outermost atom is getting stronger and the ionization energy is increasing.
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What process converts glucose to lactic acid?
Fermentation is the process by which glucose converts to lactic acid. It occurs under anaerobic condition. Lactate dehydrogenase is the enzyme responsible for it.
Cellular respiration known as anaerobic respiration takes place when oxygen is not present. Lactic acid fermentation and alcoholic fermentation are the two kinds of anaerobic respiration. Some bacteria convert pyruvic acid into lactic acid. Animal muscle cells exhibit this metabolic mechanism as well. During physical activity, muscle cells' oxygen supply for respiration may not be sufficient. Pyruvic acid is converted to lactic acid under anaerobic circumstances. When lactate dehydrogenase is present, this takes place. Additionally, an antioxidant like NADH+H+ is reoxidized to NAD+.
A significant portion of the energy is not released throughout the fermentation process. Less than 7% of the glucose's energy is released in this situation. Additionally, not all of it is included in ATP's high energy bonds.
Fermentation process:
In the breakdown of the glucose or 6-carbon molecule, glyceraldehyde 3-phosphate and 3-phosphoglyceric acid are produced.
NAD+ undergoes this transformation into NADH+H+.
When combined with 3-phosphoglyceric acid, phosphoenol pyruvic acid eventually yields pyruvic acid.
In this procedure, net 2 ATP molecules are produced (glycolysis).
NADH+H+, a reducing agent that reduces pyruvic acid to lactic acid and then reoxidizes to NAD+, aids in this process.
Two pyruvate/pyruvic acid molecules are converted into two lactate/lactic acid molecules through this procedure. The enzyme lactate dehydrogenase is present throughout this process.
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union carbide contended that the accident was the result of ____
Union Carbide contended that the accident was the result of sabotage.
Union Carbide was a chemical company that was responsible for the 1984 Bhopal disaster, which was one of the worst industrial accidents in history. The disaster resulted in the release of toxic gas into the surrounding communities, causing widespread death and injury.
In the aftermath of the disaster, Union Carbide argued that the accident was the result of sabotage, claiming that someone intentionally introduced water into the tank containing the toxic gas, which caused the release of the gas. The company maintained this position for several years, despite significant evidence suggesting that the disaster was the result of poor safety practices, inadequate maintenance, and inadequate emergency planning.
However, this claim of sabotage was widely discredited, and Union Carbide eventually admitted that the disaster was the result of operational and design failures at the plant, including the lack of safety features and the inadequate training of employees.
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When 1-chlorobutane is treated with sodium hydroxide, two products are formed_ Identify the two products: (Select all that apply:) A. 1-butyne B. 1-butanal C. 1-butene D. 2-butanol E. 2-butene F. 1-butanol
When the 1-chlorobutane is treated with sodium hydroxide, two products are formed are the correct option is C. 1 - butene F. 1 - butanol.
When 1-chlorobutane is treated with sodium hydroxide, The reaction is as follows :
1) The substitution reaction take place :
Cl - CH₂ - CH₂ - CH₂ - CH₃ + NaOH ----> OH - CH₂ - CH₂ - CH₂ - CH₃
1-chlorobutane sodium hydroxide 1 - butanol
2) The elimination reaction take place :
Cl - CH₂ - CH₂ - CH₂ - CH₃ + NaOH ----> CH = CH - CH₂ - CH₃
1-chlorobutane sodium hydroxide 1-butene
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when benzene is reacted with hot sulfuric acid or a mixture of so3 in h2so4, which group replaces a ring h?
When benzene is reacted with hot sulfuric acid or a mixture of so3 in h2so4, which group replaces a ring h?
The resulting product is the substitution of one of the hydrogen atoms in the benzene ring with a sulfonic acid group (-SO3H).
This reaction is known as sulfonation, and it results in the formation of a sulfonic acid derivative of benzene.
What is Sulfonation?
Sulfonation is a chemical process in which a sulfonic acid group (-SO3H) is introduced into a molecule. It is typically performed as a reaction between a sulfonic acid anhydride and a substrate molecule. The result of sulfonation is a sulfonated product, which has increased water solubility and improved acidity compared to the original substrate. Sulfonation is commonly used in the synthesis of surfactants, detergents, and other industrial and commercial products.
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2. a solute often takes on properties of the solvent. how was this exhibited in part 1?
The concept of a solute taking on properties of the solvent is referred to as solvation. When a solute is dissolved in a solvent, the solvent molecules surround and interact with the solute molecules. This interaction can alter the physical and chemical properties of the solute.
In part 1 of the experiment, this concept was exhibited when the solute was dissolved in the solvent and took on the properties of the solvent.
By examining the resulting solution, it was possible to observe the changes in the solute as it was influenced by the solvent. The physical appearance, as well as the chemical behavior, of the solute can change after being dissolved in the solvent.
The relationship between the solute and solvent is important in various fields including chemistry, biology, and pharmacology, as it helps to determine the solubility, stability, and reactivity of the solute in the solvent.
By understanding the properties of the solvent and how they impact the solute, researchers can optimize the conditions for various processes, including drug delivery and chemical reactions.
In conclusion, the concept of a solute taking on properties of the solvent was demonstrated in part 1 of the experiment. The solvation process, in which the solute is surrounded and interacts with the solvent, can greatly influence the physical and chemical properties of the solute.
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How do you find the limiting reagent in a reaction example?
To find the limiting reagent in a reaction example, you must first identify the reactants and their respective molar amounts.
Then, you must calculate the moles of each reactant, and the moles of product that can be formed from the given amount of each reactant.
Finally, you must compare the moles of each reactant to the moles of the product that can be formed and determine which reactant is in the smallest amount. This reactant is the limiting reagent.
What is reaction?
In chemistry, a reaction is a process that involves the rearrangement of atoms to form new substances. Reactions are the building blocks of chemistry, and when chemical reactions occur, substances are broken apart and rearranged to form new substances with different chemical properties.
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find the weight of BACL2 in 250cm³solution if given that after addition of 40.0cm³ of 0.102M AGNO3 solution to 30cm³ of the BACL2 solution, back titration of the excess AGNO3 required 20cm³ of 0.098M NH4CNS solution
Answer:
sample containing only BaCl2
and NaCl
is dissolved in 50 mL
of distilled water. Titrating with 0.07916 M
AgNO3
requires 19.46 mL
to reach the end point. What is the weight percent of BaCl2
in the sample? (Molar mass of BaCl2=208.232 gmol−1
and Molar mass of NaCl=58.4425 gmol−1
)
The way I did it was ;
0.1036g of sample contained 266.6745 Molar mass of BaCl2
and NaCl
i.e. 0.1036g of sample= 266.6745 of substance
x g = 208.232 of BaCl2
only
x g=(0.1036*208.232)/266.6745
=0.08089 g
Where 0.08089 g is the mass of BaCl2
present in the sample.
Weight % = (0.08089/0.1036)*100%
= 78%
I don't know if I'm correct.
what is the correct solution to the assignment please?
hydrogen peroxide decomposes to release oxygen. how much space does the oxygen occupy if 40.8 g of hydrogen peroxide decomposes at –13ec and 2.40 atm?
The volume of oxygen produced is 25.1 L.
To determine the volume of oxygen produced, we need to consider the balanced chemical equation for the decomposition of hydrogen peroxide and the ideal gas law. The balanced chemical equation for the decomposition of hydrogen peroxide is:
[tex]2H_{2}O_{2}- > 2H_{2}O+O_{2}[/tex]
We can see that for every mole of hydrogen peroxide decomposed, one mole of oxygen is produced. We can convert 40.8 g of hydrogen peroxide to moles and then determine the number of moles of oxygen produced. Using the molar mass of hydrogen peroxide (34.01 g/mol), we find that 40.8 g of hydrogen peroxide is equivalent to 1.20 moles. Hence, 1.20 moles of oxygen are produced.
Next, we can use the ideal gas law, PV = nRT, to determine the volume of oxygen produced. Here, P = 2.40 atm, V = ?, n = 1.20 moles, R = 0.0821 L-atm/mol-K, and T = (-13 + 273) K = 260 K. Solving for V, we find that the volume of oxygen produced is 25.1 L.
So, in conclusion, if 40.8 g of hydrogen peroxide decomposes at -13°C and 2.40 atm, the volume of oxygen produced is 25.1 L.
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A buffer solution at pH 10 has a ratio of [HA]/[A−] of 10. What is the pKa of the acid?a. 8b. 9c. 10d. 11e. 12
A buffer solution at pH 10 has the ratio of [HA] / [A⁻] of 10.The pKa of the acid is 11.
The pH is as follows :
pH = pka + log [A⁻] / [ HA]
Where
The pH = 10
[A⁻] / [ HA] = 1 / 10
By solving the values , we get :
pH = pka + log [A⁻] / [ HA]
10 = pka + log(1/ 10)
10 = pka + log (0.1 )
10 = pka + (-1 )
10 = pka - 1
pka = 11
The pka value is 11 for the pH of value 10.
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do the sp2 carbons and the indicated sp3 carbons lie in the same plane?
The sp² carbons and the indicated sp³ carbons are not lie in the same plane.
What is hybridization ?The phenomenon of hybridization is the combination of two atomic orbitals to produce a new degenerate hybrid orbital with the same energy levels. Hybridization improves bond formation stability over unhybridised orbitals. The hybridization of molecules allows us to predict their shape.
Because pi bonds prevent atoms from rotating, they will be in the same plane if they have a double or triple bond. Furthermore, if the atoms are trigonal or square planar, they are in the same plane.
Thus, The sp² carbons and the indicated sp³ carbons are not lie in the same plane.
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The structural formula of magnesium chloride is represented as ?
Ionic halides, like magnesium chloride, are essentially salts that are very soluble in water. Both anhydrous and numerous hydrated crystal forms of this chemical are available.
What is the chemical formula for magnesium chloride?Magnesium has a propensity to lose two electrons during in the reaction between it and chlorine. It has a +2 charge. To complete magnesium's octoate, however, chlorine atom atoms are required to capture two of its electrons.
How does magnesium chloride work?For students, the magnesium formula is essential. They ought to be educated and aware of it. One of the found naturally inorganic compounds, magnesium chloride has a wide range of uses in business and the medical profession. It is also a crucial mineral for people.
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Ionic halides, like magnesium chloride, are essentially salts that are very soluble in water. Both anhydrous and numerous hydrated crystal forms of this chemical are available.
What is the chemical formula for magnesium chloride?
Magnesium has a propensity to lose two electrons during in the reaction between it and chlorine. It has a +2 charge. To complete magnesium's octoate, however, chlorine atom atoms are required to capture two of its electrons.
How does magnesium chloride work?
For students, the magnesium formula is essential. They ought to be educated and aware of it. One of the found naturally inorganic compounds, magnesium chloride has a wide range of uses in business and the medical profession. It is also a crucial mineral for people.
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which are true about lubricants for cutting? they are composed almost entirely of hydrocarbons with some additives. they should be used at lower cutting speeds than other types of cutting fluids. they make cutting surfaces smoother. they dissolve easily in water they make it easier for cutting chips to not to stick to the cutting tool. they reduce the temperature of the cutting tool, but not as much as other cutting fluids.
A lubricant must keep its properties in the presence of additives and other items. Lubricating oil colours are more of a test for a grade or brand of oil's consistency than they are for its attributes. Thus, option B is correct.
What are the characteristics of lubricants?There are four different kinds of liquid lubricants. Mineral oil a. It is a material made from petroleum. These oils are stable at high temperatures because they have a high paraffine and naphthanic content.
Examples include steam cylinder oil, wire rope oil, refrigeration grade oil, gear oil, machine or engine oil, and circulating oil.
Therefore, they should be used at lower cutting speeds than other types of cutting fluids. They make cutting surfaces smoother.
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calculate the vapor pressure (in torr) at 293 k in a solution prepared by dissolving 16.20 g of the non-volatile non-electrolyte urea {co(nh2)2} in 156 g of water. the vapor pressure of water at 293 k is 17.54 torr.
The vapor pressure (in torr) at 293 k in a solution prepared by dissolving 16.20 g of the non-volatile non-electrolyte urea {CO(NH₂)₂} in 156 g of water.
The relative lowering of vapor pressure is one of colligative property. That means the vapor pressure of the solution should be lower than the vapor pressure of solvent i.e. water. The formula to calculate the vapor pressure of the solution is (P° - P)/P° = x, where P° = vapor pressure of solvent i.e. water = 17.54 torr.
P = vapour pressure of solution x = mol fraction of solute = (mol of solute)/(total mol)Mol of solute = mass / molar mass = 16.20 g /60g/mol = 0.27 mol
Mol of solvent = mass / molar mass = 156g/18g/mol = 8.66 mol
Total moles = 0.27 mol + 8.66 mol = 8.93 mol
Hence, x = (0.27mol) /(8.93 mol) = 0.0302.
Now put these data into the above equation to find the vapor pressure of solution(P).
=> P = P° ( 1 - x )
=> P = 17.54 ( 1 - 0.0302 )
=> P = 17.54 × 0.9698
=> P = 17.01
Hence, the required vapour pressure of water is 17.01 torr at 293 k.
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