Ch 12 Energy Changes and Chemical Reactions

This graph is an energy diagram for a chemical reaction. Which is true of this type of reaction?

• More energy is required to break reactant bonds than is released when product bonds form
• Less energy is required to break reactant bonds than is released when product bonds form
• The bonds of the reactants do not require energy to break because the reaction releases energy
• The bonds of the reactants require energy to break, and therefore the reaction absorbs energy

What happens when a bond forms between two atoms?

• energy is created by the bond
• energy is destroyed by the bond
• energy is released by the bond
• energy is absorbed by the bond

What type of reactions require energy in order to start?

• neither endothermic nor exothermic reactions
• endothermic reactions only
• exothermic reactions only
• both endothermic and exothermic reactions

Which line correctly represents the relationship between pressure and the reaction rate of two gases?

• line A
• line B
• line C
• line D

Which is a way to increase the rate of a reaction?

• add an inhibitor
• cool the reactants first
• increase the surface area of the reactants
• decrease the concentration of the reactants