1. Which of the following is correct about a molecule of carbon trichloride?

a. It has one carbon atom for each chloride atom.

b. It has three chloride atoms for each carbon atom.

c. It has three carbon atoms for each chloride atom.

d. It is a mixture of equal parts carbon and trichloride.

e. It is a solution of carbon in chlorine.

2. What is the term for the substances that undergo a change in a chemical reaction?

a. Solutions

b. Products

c. Solvents

d. Catalysts

e. Reactants

3. When methane (CH4) burns it combines with oxygen and forms carbon dioxide and water. Which of the following is the balanced chemical reaction for the burning of methane?

a. CH4 + O2 → CO2 + H2O

b. 3 CH4 + 6 O2 → 3 CO2 + 6 H2O

c. 2 CH4 + 3 O2 → CO2 + 4 H2O

d. CH4 + 3 O2 → 2 CO2 + 2 H2O

e. CH4 + 2 O2 → CO2 + 2 H2O