Quarter 4 Review

What letter represents the activation energy?

• A
• B
• C
• D

Activation energy is required to start a chemical reaction. What is activation energy?

• The energy needed for a reaction to occur
• The minimum amount of energy needed for a reaction to potentially occur
• The energy added by a catalyst
• The energy possessed by the products

Grinding a seltzer tablet into powder increases the rate of reaction due to increased

• concentration
• surface area
• temperature
• reactants

Increase in temperature of the reactants can do one of the following

• Slow collision frequency
• Allow less effective collision between the particles
• Cause particles to lose speed
• Increase collision between the particles thus increasing the rate.

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 

• catalyst
• product
• reactant
• solute

Smaller particle size allows for a _________ surface area to be exposed for the reaction.

• larger
• smaller

Increasing the concentration of the reactants will slow down the reaction.

• false 
• true

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants
• it lowers the activation energy
• it increases the energy of particle collisions
• it increases the frequency of particle collisions because there are more collision sites

Identify the correct equation to calculate the rate of reaction.

• Rate of reaction = decrease in reactants ÷ time

• Rate of reaction = increase in products ÷ time

• Rate of reaction = end time - start time

• Rate = EITHER (decrease in reactants) OR (increase in products) ÷ time

What is the equation for calculating rate of reaction?

• amount of reactant used divided by time taken

• amount of product formed divided by time taken

• Both these are correct