Please help with my CHEMISTRY :(?

The solubility of calcium carbonate in water at 25 °C is 0.00015 M. What is the value of Ksp at this temperature?

a. Ksp = 1.5 ´ 10–4

b. Ksp = 2.25 ´ 10–8

c. Ksp = 1.5 ´ 10–8

d. Ksp = 2.25 ´ 10–2

How can you increase the amount of A2B2 in the closed system reaction below?

A2(g) + 2B(g) A2B2(g) + heat

Answer

a. Increase pressure.

b. Decrease concentration of A2.

c. Increase temperature.

d. Decrease concentration of B.

If the chemical reaction below is taking place in a beaker, how will heating the solution in the beaker affect the equilibrium?

Ag+(aq) + Cl–(aq) AgCl(s) + heat

Answer

a. Adding heat will not affect the equilibrium.

b. Equilibrium will shift toward the reactants.

c. The reaction will go to completion and no longer be in equilibrium.

d. Equilibrium will shift toward the products.

Which of these statements describes the effect of increasing concentration of a product of a reversible reaction in an aqueous solution?

Answer

a.Shifts equilibrium toward the reactants but does not affect the value of K.

b. Shifts equilibrium toward the products and decreases the value of K.

c. Shifts equilibrium toward the reactants and decreases the value of K.

d. Does not shift the equilibrium but increases the value of K.

What is the solubility in mol/L of cobalt(II) sulfide, CoS? Its Ksp value is 3.0 « 10–26.