CHEMISTRY HIGH SCHOOL

Of the choices below, which is true for the relationship shown? a. It is Ka for the acid H3P2O72−. b. It is Kb for the acid H3P2O72−. c. It is Ka for the acid H2P2O72−. d. It is Kb for the acid H2P2O7

Answers

Answer 1
Answer: The expression for the Ka for the given acid is:

Ka = [H2P2O7^2-] [H3O+] /[H3P2O7^2-]

Ka is the acid dissociation constant or the acidity constant. It is a measure of the acid strength when in solution. It is an equilibrium constant for the dissociation of the acid.
Answer 2
Answer:

Answer:

It is Ka for the acid H3P2O72−.

Explanation:

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Heating zinc sulfide in the air causes the formation of

Answers

Zinc sulfoxide? I think this right I am not sure

How many grams of KOH used to make 1.6 liters of 15% by mass solution with water as the solvent?

Answers

Given:

KOH used to make 1.6 liters of 15% by mass solution with water

 

Required:

grams of KOH

 

solution:

the density of KOH is equal to 2.12 kg/L

multiply  the known volume of KOH to the density and the percentage of KOH in water

mass of KOH = 1.6 L (2.12 kg/L)(0.15) = 22.61 grams of KOH

Suggest what happens if we decrease the temperature of a reaction at dynamic equilibrium.

Answers

If the temperature of a reaction at dynamic equilibrium is decreased, the system will try to counteract the change by favoring the exothermic or heat-releasing reaction. This is governed by Le Chatelier's principle, which states that if a system at equilibrium is subjected to a change, it will react in a way that tends to counteract the change.

In this context, by decreasing the temperature, the system will shift in the direction that produces more heat, essentially favoring the exothermic reaction. This shift allows the system to absorb the added heat and counteract the temperature decrease.

Which type of stoichiometric calculation does not require the use of the molar mass?

Answers

The choices can be found elsewhere and as follows:

a. mass-mass problems 
b. mass-volume problems 
c. mass-particle problems 
d. volume-volume problems

I believe the correct answer is option D. It is volume-volume problems that does not require the use of molar mass.  Here you are dealing with molarities and volumes to determine concentrations. Molar mass is not part of any calculations.

Final answer:

The type of stoichiometric calculation that does not require the use of the molar mass is a calculation involving molar or stoichiometric ratios which are derived directly from the coefficients in a balanced chemical equation.

Explanation:

In stoichiometry, there are several types of calculations that can be performed. However, the type of stoichiometric calculation that does not require the use of the molar mass is the calculation involving the molar ratio, or stoichiometric ratio. This refers to the ratio of coefficients in a balanced chemical equation, which we use to determine the relative amounts of each substance involved in a chemical reaction.

An example of this is a balanced equation for the formation of water: H2 + 0.5O2 -> H2O. In this equation, the molar or stoichiometric ratio of hydrogen (H2) to oxygen (O2) to water (H2O) is 2:1:2. If we are given the number of moles of one substance, we can use this molar ratio to find the number of moles of any other substance in the equation, without needing to know their molar masses. This constitutes a stoichiometric calculation without the need for molar mass.

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The two subspecialty of astronomy are

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Astrophysics and Planetary science. The former in a nutshell is the study of how stars work, and theories surrounding how celestial bodies operate. Planetary Science is more rooted in contemporary science, as it studies the nature of planets in our solar system and beyond, such as Mars.

The two subspecialty of astronomy are astrophysics and planetaryscience. Correct option is D.

Astronomy is the scientific study of celestial objects, such as stars, planets, galaxies, and other phenomena in the universe. Within the field of astronomy, there are several subspecialties that focus on specific aspects of celestial objects and phenomena.

Astrophysics: Astrophysics is a branch of astronomy that deals with the physical properties, behavior, and interactions of celestial objects. It involves the application of physics principles and theories to understand the nature of stars, galaxies, black holes, and other cosmic phenomena. Astrophysicists study the processes that govern the birth, evolution, and death of stars, as well as the formation and dynamics of galaxies.

Planetary Science: Planetary science is another subspecialty of astronomy that focuses on the study of planets, moons, asteroids, comets, and other objects within our solar system and beyond. Planetary scientists investigate the geology, atmospheres, surfaces, and composition of planets and their satellites. They also study the origin and evolution of planets, the potential for habitability, and the possibility of past or present life on other celestial bodies.

Both astrophysics and planetary science are essential in expanding our understanding of the cosmos. Astrophysics helps us comprehend the fundamental principles and processes that govern the entire universe, while planetary science provides insights into the unique characteristics and properties of the planets and bodies within our solar system, shedding light on potential habitability and the origins of life.

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Hydrochloric acid (HCl) is combined with cesium hydroxide (CsOH) in a neutralization reaction. Which ions will combine to form a salt? Check all that apply.H+
H3O+
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Answers

HCl + CsOH --> CsCl + H2O

So the ions making up the salt: Cl- and Cs+

Answer:

The answers are C and D

Explanation:
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