Unit 6 - Chemistry Review Guide

What is the general equation for a synthesis reaction?

• A) A + B → AB

• B) AB → A + B

• C) AB + C → AC + B

Fill in the blank: In a decomposition reaction, one reactant breaks down into two products. General equation: _______.

• AB → A + B.

• A + B → AB

• A + B → C

• AB + C → AC + B

What is the specific example of a single replacement reaction given in the guide?

• A) NaCl → Na + Cl

• B) HCl + Zn → H2 + ZnCl2

• C) CH4 + O2 → H2O + CO2

What is the balanced chemical equation for the reaction: Br2 I2 N2 Cl2 H2 O2 F2?

• BrINClHOF

• BrNClHOF

• BrINClHOF2

In the reaction Mg + S → MgS, which element is oxidized?

• Mg

• S

• MgS

In the reaction CuO + H2 → Cu + H2O, which element is reduced?

• Cu

• H2

• CuO

• H2O

The concept of activation energy in chemical reactions is:

• the minimum energy required to start a reaction

• the energy released during a reaction

• the energy absorbed during a reaction

• the energy at equilibrium

What effect does increasing the temperature have on the rate of a chemical reaction?

• It decreases the rate of reaction.

• It increases the rate of reaction.

• It has no effect on the rate of reaction.

• It reverses the reaction.

Fill in the blank: The higher the concentration of reactants, the ______ the reaction.

• faster

• slower

• more unpredictable

• less efficient

Which of the following statements is true about particle size and surface area?

• A) Larger particles have more surface area.

• B) Smaller particles have more surface area.

• C) Particle size does not affect surface area.

• D) Surface area is unrelated to reaction rate.