Unit 4 Chemical Reactions

The substances that undergo change in a chemical reaction are called

• reactants

• products

Hydrochloric acid, HCl, is added to solid NaOH. After the reaction is complete, NaCl dissolved in water remains. What are the products of this chemical reaction?

• NaOH and HCl

• NaCl and H2O

The total amount of energy before and after a chemical reaction is the same. Thus, energy is

• conserved.

• created.

In general, if the temperature of a chemical reaction is increased, the reaction rate

• increases.

• decreases.

In the following equation, what are the reactants?

NAHCO3 + HCl ---------> NaCl + H2O + CO2

• NAHCO3 and HCl

• NaCl, H2O , and CO2

Which of the following is a statement of the law of conservation of mass?

• Mass is destroyed, but not created.

• Mass is neither created or destroyed.

In which type of reaction does one reactant form two or more products?

• synthesis

• decomposition

• single replacement

What particle is transferred from one atom to another in a reaction?

• electrons

• protons

• neutrons

What takes place at chemical equilibrium?

• Products and reactants form at the same rate.

• Products form more quickly than reactants.

What is an oxidation reaction?

• A reaction occurring when atoms gain electrons

• A reaction occurring when atoms lose electrons