Arsenic acid, H3AsO4, is a triprotic acid with the following acid dissociation constants:
Ka1 = 5.5 × 10-3 ? Ka2 = 1.7 × 10-7 ? Ka3 = 5.1 × 10-12
Which of the following combinations would be best for preparing a pH 7 buffer?

A. Na2HAsO4 and Na3AsO4

B. H3AsO4 and HCl

C. H3AsO4 and Na3AsO4

D. NaH2AsO4 and Na2AsPO4

E. H3AsO4 and NaH2AsO4

To determine the percent by mass of water in a sample of hydrated copper (II) sulfate (CuSO₄ · 5H₂O), divide the molar mass of 5H₂O by the molar mass of CuSO₄ · 5H₂O and multiply by 100.

To determine the percent by mass of water in a sample of hydrated copper (II) sulfate (CuSO₄ · 5H₂O), you can follow these steps:

By following these steps, you can determine the percent by mass of water in a sample of hydrated copper (II) sulfate (CuSO₄ · 5H₂O).

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Answer:

+ 100 Kj

Explanation:

The very minimum energy required to activate atoms or molecules to undergo chemical transformation.

Answer:

It is 60kj.

Explanation:

It is the highest point minus where a+b is at, so it is 60kj.

The solubility of a compound is influenced by factors such as temperature, pressure, concentration, and the nature of the solute and solvent.

It is critical to note that temperature and pressure have a greater impact on the solubility of solids and liquids than on gases. Let's explore each of these factors in more detail.

Temperature: The solubility of solid compounds in water generally increases as temperature increases. For example, sugar is more soluble in hot water than in cold water. The solubility of gas compounds in water decreases as temperature increases. As a result, it is harder to dissolve CO2 in warm soda than in cold soda.

Pressure: Pressure affects the solubility of gases. As the pressure increases, the solubility of a gas in a solvent increases as well. This is why soda can be carbonated at high pressures.

Concentration: The concentration of the solute in the solvent has an effect on the solubility of a compound. The solubility of a compound decreases as its concentration in the solvent increases. If you add more and more sugar to water, it will eventually become saturated, which means that it cannot dissolve any more sugar.

Nature of the solute and solvent: The solubility of a compound is also influenced by the nature of the solute and solvent. For example, polar solvents like water dissolve polar compounds, while nonpolar solvents dissolve nonpolar compounds. If the solute and solvent are polar, the solute is more likely to dissolve in the solvent.

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The atomic number for the chromium isotope with 28 neutrons is 24, and the isotope is known as Chromium-52.

The atomic number of an element refers to the number of protons in its nucleus. Therefore, to determine the atomic number of the chromium isotope with 28 neutrons, we need to know the total number of particles in the nucleus. The atomic mass of chromium is 52, which is the sum of its protons and neutrons.

Since we know that this particular isotope has 28 neutrons, we can subtract that from the atomic mass to find the number of protons. 52 - 28 = 24. Therefore, the atomic number of the chromium isotope with 28 neutrons is 24. This means that the atom has 24 protons in its nucleus and 24 electrons surrounding the nucleus to maintain electrical neutrality.

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Answer:

2.2 moles

Explanation:

n = CV

n = 0.4×5.50

n=2.2 moles

Answer:

Explanation:

#2 is answered so here is for #3:

Knowns: 100mL of solution; concentration of 0.7M

Unknown: number of moles

Equation: number of moles = volume * concentration

Plug and Chug: number of moles = 100/1000 * 0.7 = 0.07 mole

Final Answer: 0.07mole

Answer:

32kg/j correct me if I am wrong

Answer:

1.38 kJ/g

Explanation:

it is answer

Answer:

320.23g of CH3OH.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CO(g) + 2H2(g)—> CH3OH(l)

Next, we shall determine the masses of CO and H2 that reacted and the mass of CH3OH produced from the balanced equation. This is illustrated below below:

Molar mass of CO = 12 + 16 = 28g/mol

Mass of CO from the balanced equation = 1 x 28 = 28g

Molar mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 2 x 2= 4g

Molar mass of CH3OH = 12 + (3x1) + 16 + 1 = 32g/mol

Mass of CH3OH from the balanced equation = 1 x 32 = 32g

From the balanced equation above,

28g of CO reacted with 4g of H2 to produce 32g of CH3OH.

Next, we shall determine the the limiting reactant. This is illustrated below:

From the balanced equation above,

28g of CO reacted with 4g of H2.

280.2g of CO will react with =

(280.2 x 4)/28 = 40.03g of H2.

From the calculations made above, we can see that only 40.03g out of 50.5g of H2 is required to react completely with 280.2g of CO.

Therefore, CO is the limiting reactant and H2 is the excess reactant.

Finally, we shall determine the mass of methanol, CH3OH produced from the reaction.

In this case, the limiting reactant will be used because it will give the maximum yield of the reaction since all of it is used up in the reaction. The limiting reactant is CO and the mass of methanol, CH3OH produced can be obtained as follow:

From the balanced equation above,

28g of CO reacted to produce 32g of CH3OH.

Therefore, 280.2g of CO will react to produce = (280.2 x 32)/28 = 320.23g of CH3OH.

Therefore, 320.23g of CH3OH were produced from the reaction.

Based on the results obtained in the table, the solute is a solid because it has an increase in the amount dissolved as temperature increases.

The correct option is B.

The average kinetic energy of the solute molecules increases along with the solution's temperature. As a result, the molecules have a lower ability to bind together and dissolve more easily. Therefore, when the temperature rises, solid states become more soluble.

However, for solutes that are gas, an increase in temperature decreases the solubility of the gas, and the gas comes out of the solution.

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50%

Because f is dominant to 1, it will be a 50/50 chance of the offspring having short fur, or long fur.

Pls correct me if im wrong

Answer:

Established by French chemist François-Marie Raoult in 1887, it states that the partial pressure of each component of an ideal mixture of liquids is equal to the vapour pressure of the pure component multiplied by its mole fraction in the mixture.

Explanation:

The given solution is a buffer.

When acidic or basic components are added to a buffer solution, it can withstand changes in pH. The solution's pH can be maintained relatively stable by neutralizing small amounts of added acids or bases. This is important for processes and reactions that require a specific and stable pH range. A buffer is an aqueous acid or base solution consisting of a mixture of a weak acid and its conjugate base or vice versa. Addition of a small amount of strong acid or strong base hardly changes the pH. 

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Answer:

yes

Explanation:

Answer:

578.....882...767..86

An acid-base reaction occurs when a fatty acid interacts with NaOH, and the fatty acid transfers a proton to the base to produce sodium carboxylate salt and water.

Triglycerides are converted into glycerol and "soap" when they are saponified, or reacted with sodium or potassium hydroxide (lye). The triglycerides are often made of vegetable or animal fats. A hard soap is created when sodium hydroxide is used.

Fats, oils, or lipids (the acid) are turned into soap by the process of saponification by mixing them with sodium hydroxide (the base). Friction and heat from the chemical reaction are essential. The neutralization of the acid and base occurs during saponification.

Thus, any type of fat and sodium hydroxide react chemically in a process known as saponification.

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The height of a ramp does not directly determine the strength of the frictional force between a book and an object.

The strength of the frictional force between a book and an object is not directly influenced by the height of a ramp. The nature of the surfaces in contact, the force forcing the surfaces together (normal force), and the coefficient of friction are some of the variables that affect the frictional force between two surfaces.

The coefficient of friction between the book and the object plays a major role in determining the strength of the frictional force.

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Answer:

I think c.............

Answer:

The Dog

Explanation:

The more mass something has the more kinetic energy it has in it.

Answer:

27.2 kg

Explanation:

13.6 * 2 L of commercial flask of mercury = 27.2 kg.

Hope this helps! Have a good day! :D

Answer:

Explanation:

What is the "theoretical yield" of cookies from each of the "reactants?"

Theor. yield from eggs

=

12

eggs

×

24 cookies

1

egg

=

288 cookies

Theor. yield from vanilla

=

24

tsp vanilla

×

24 cookies

1

tsp vanilla

=

576 cookies

Theor. yield from salt

=

82

tsp salt

×

24 cookies

0.5

tsp salt

=

3936 cookies

Theor. yield from baking soda

=

84

tsp baking soda

×

24 cookies

0.5

tsp baking soda

=

4032 cookies

Theor. yield from chocolate chips

=

3

cups chocolate chips

×

24 cookies

1.333

cups chocolate chips

=

54 cookies

Theor. yield from sugar

=

11

cups sugar

×

24 cookies

0.5

cup sugar

=

528 cookies

Theor. yield from brown sugar

=

4

cups brown sugar

×

24 cookies

0.5

cup brown sugar

=

192 cookies

Finally, "we leave it as an exercise for the student" to calculate that

Theor. yield from margarine = 72 cookies

b. Identify the limiting reactant

The limiting reactant is the amount of chocolate chips because they can produce the smallest amount of cookies.

c. Determine the theoretical yield

The theoretical yield is 54 cookies, because that is all you can get from the chocolate chips provided.

The percent yield obtained on baking the cookies is 20 % and the theoretical yield is 25 cookies.

Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.

In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .

As cookies obtained is 5 it is observed yield while 25 is theoretical yield so the percent yield, 5/25×100=20%.

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B. ball rolling down the hill

The type of energy that is NOT chemical energy is:

B. ball rolling down the hill

Chemical energy refers to the energy stored in chemical substances, such as the energy released during a chemical reaction or the energy stored in the bonds of molecules.

Options A, C, D, and E all involve examples of chemical energy:

A. Butane in a lighter:

The combustion of butane releases chemical energy in the form of heat and light.

C. Food:

The energy stored in food molecules, such as carbohydrates, fats, and proteins, is converted into chemical energy during metabolism.

D. Gasoline in a car:

The combustion of gasoline in an engine releases chemical energy, which is converted into mechanical energy to power the car.

E. Battery:

Batteries store chemical energy that can be converted into electrical energy through chemical reactions.

In contrast, option B, a ball rolling down the hill, involves kinetic energy. Kinetic energy refers to the energy of an object due to its motion.

As the ball rolls downhill, its energy is in the form of kinetic energy, not chemical energy.

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Answer:

True i think.

Explanation:

Answer:

Explanation:

To find the speed given the kinetic energy and mass we use the formula

\(v = \sqrt{ \frac{2KE}{m} } \\ \)

where

m is the mass

v is the speed

From the question

KE = 15 J

m = 2.3 kg

We have

\(v = \sqrt{ \frac{2 \times 15}{2.3} } = \sqrt{ \frac{30}{2.3} } \\ = 3.61157559...\)

We have the final answer as

Hope this helps you

Part A: The possible values of the angular momentum quantum number (l) are all the non-negative integers: 0, 1, 2, ..., n-1, where n is the principal quantum number.

In quantum mechanics, the angular momentum quantum number represents the magnitude of the angular momentum of an electron in an atom. Its values are determined by the principal quantum number (n) and determine the shape of the orbital. The formula l = 0, 1, 2, ..., n-1 indicates that the angular momentum quantum number can take on any non-negative integer value less than the principal quantum number.

Part B: The angular momentum quantum number (l) determines the shape of the orbital and the orientation of the orbital.

The angular momentum quantum number influences the spatial distribution and orientation of the electron cloud in an atom. It determines the shape of the orbital, such as s, p, d, or f orbitals. Additionally, it specifies the orientation or direction in space of the orbital within its designated shape. The other options listed (the energy of an orbital, the energy of the electron on the outer shell, the possible number of electrons on a particular orbital, the overall size of an atom, and the overall size of an orbital) are determined by different factors such as the principal quantum number, magnetic quantum number, and the total number of electrons in the atom.

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Answer:

Phycical science is the study of the body.

Explanation:

The average molecular velocity of the molecules will decrease as the reaction goes to completion at a constant temperature.

What is Molecular velocity?

Molecular velocity is the average speed of molecules in a sample of matter. It is determined by the temperature of the sample, with higher temperatures resulting in higher molecular velocities.

This is because the reaction produces a single product, meaning that the number of molecules in the reaction vessel is decreasing as the reaction goes to completion. As the number of molecules decreases, the average molecular velocity of the molecules decreases as well.

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Answer:

0.03g

Explanation:

Given parameters:

Number of moles of Na = 0.00125mole

Unknown:

Mass in grams of Na = ?

Solution:

To find the mass of this substance, we simply multiply the number of moles with the given molar mass of Na.

 Mass of Na  = number of moles x molar mass

 Mass of Na  = 0.00125 x 23   = 0.03g

Catalysts, such as the minerals deposited on hydrothermal vent walls, bring reactants together and increase the speed of the reactions without providing energy.

We can define catalysts as substances that increase the speed of a reaction. The catalysts themselves remain unchanged in a chemical reaction and work by lowering the temperature, pressure and energy levels.

Without a catalyst, a chemical reaction will take a long time to occur.

The rate of a reaction increases using a catalyst for the reaction. Some of the minerals that act as catalyst in hydrothermal vents are iron, nickel and sulfide minerals.

The oxides of most metals acts as catalysts. Inside the body of organisms, enzymes act as biological catalysts.

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Answer:5O2 + 2N2 --> 2N2O5 and 2NaCl + F2 --> 2NaF + Cl2

Explanation:
1ST question
go to the products side and check the number of oxygen and nitrogen atoms , O-5 , N-2 , to balance this equation you need to add 2 in front of N2O5 and 5 in front of O2 (total oxygen atoms =10(5x2)). and 2 in front of N2 (total nitrogen atoms=4(2x2))

then : 5O2 + 2N2 --> 2N2O5

2nd question -
When NaCl (sodium chloride) reacts with fluorine the equation gives NaF(Sodium fluoride) so the remaining ion is chlorine so the other product needs to be chlorine gas which is Cl2

then : 2NaCl + 2F2 --> 2NaF + Cl2

The concentration of nitrogen 2 mm from the surface after 25 hours is approximately 0.0198 wt%.

To find the concentration of nitrogen 2 mm from the surface after 25 hours, we can use Fick's second law of diffusion. The formula is given by:

C(x, t) = C0 * erfc((x / (2 * sqrt(D * t)))

Where:
C(x, t) is the concentration at a distance x from the surface at time t
C0 is the initial concentration at the surface
erfc is the complementary error function
D is the diffusion coefficient
x is the distance from the surface
t is the time

Given:
Initial concentration, C0 = 2 wt% = 0.02
Diffusion coefficient, D = 2.8 x 10^-11 m^2/s
Distance from the surface, x = 2 mm = 0.002 m
Time, t = 25 hours = 25 * 3600 seconds = 90000 seconds

Substituting these values into the formula:

C(0.002, 90000) = 0.02 * erfc((0.002 / (2 * sqrt(2.8 x 10^-11 * 90000))))

Evaluating this equation, we find that the concentration of nitrogen 2 mm from the surface after 25 hours is approximately 0.0198 wt%.

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Answer:

It would sink because the density of the ball, 0.802 g/cm3, is greater than the density of gasoline.

On comparing the densities of both ball and gasoline, the density of the plastic ball is larger than that of petrol, it would sink in a container of petrol.

Mass is a physical property of matter that measures the amount of substance in an object. It is typically measured in grams (g) or kilograms (kg).

The density of the plastic ball can be calculated using the formula:

Density = Mass / Volume

Density of the plastic ball = 15.8 g / 19.7 \(\rm cm^3\) = 0.801 g/ \(\rm cm^3\)

The density of gasoline is about 0.7 g/ \(\rm cm^3\)

Since, the density of the plastic ball is greater than the density of gasoline, the plastic ball would sink in a container of gasoline.

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