Unit 4 exam review

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy in the form of heat or light.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, usually in the form of heat.

Front

What does it mean for a substance to be soluble?

Back

A substance is soluble if it can dissolve in a solvent, forming a solution.

Front

What does it mean for a substance to be insoluble?

Back

A substance is insoluble if it cannot dissolve in a solvent, remaining as a separate phase.

Front

What is the solubility of K3PO4 in water?

Back

K3PO4 (Potassium phosphate) is soluble in water.

Front

What is the solubility of CuS in water?

Back

CuS (Copper(II) sulfide) is insoluble in water.

Front

How do you calculate pH from hydroxide ion concentration?

Back

pH = 14 - pOH; pOH = -log[OH-]. For [OH-] = 8.41 x 10^-4, pOH = 3.08, so pH = 10.92.

Front

What is the pH of a neutral solution at 25°C?

Back

The pH of a neutral solution at 25°C is 7.

Front

What is the relationship between pH and pOH?

Back

pH + pOH = 14 at 25°C.

Front

What are the products of a combustion reaction?

Back

The products of a combustion reaction are typically carbon dioxide (CO2) and water (H2O).