Kinetics Practice Questions

What is a catalyst?

• A substance that speeds up chemical reactions

• A type of reaction that produces energy

• A substance that slows down the rate of a reaction

• A type of reaction that produces a new product

HOW do catalysts work?

• By lowering activation energy

• By increasing the reaction rate

• By increasing the reactant concentration

• By providing an alternative reaction pathway

What is activation energy?

• The energy needed to start a reaction.

• The amount of energy released during a reaction.

• The amount of energy required to break a bond.

• The amount of energy needed to keep a reaction going.

Which graph shows the use of a catalyst?

• Graph 1

• Graph 2

• Neither of these graphs

• Both of these graphs

WHY does the red graph show a reaction with a catalyst?

• Because it shows that the activation energy was lowered.

• Because it shows that the activation energy was raised.

• The red graph does NOT show a reaction with a catalyst.

• Because it takes MORE energy to get the reaction started.

How will the equilibrium of this reaction change if the temperature of the reaction is increased by 200°C?

CO2(g) + CaO(s) 🡨🡪 CaCO3(s)       (exothermic)

• Equilibrium will shift to the left

• Equilibrium will shift to the right

• Equilibrium will remain unchanged

• Equilibrium will not shift at all

Look at the equation:

CO_2(g) + CaO_(s) 🡨🡪 CaCO_3(s)       (exothermic)

What would happen if the pressure is increased?

• Equilibrium will shift left

• Equilibrium will shift right

• Temperature will increase

• Equilibrium will not shift

CO_2(g) + CaO_(s) 🡨🡪 CaCO_3(s)       (exothermic) 

As the reaction progresses, more CO₂ is steadily added.

What happens to Equilibrium?

• Equilibrium will shift left

• Equilibrium will remain unchanged

• Equilibrium will shift right

• Equilibrium will become more exothermic

CO_2(g) + CaO_(s) 🡨🡪 CaCO_3(s)       (exothermic) 

A catalyst is added to the system.

What happens to Equilibrium?

• Equilibrium will shift left

• Equilibrium will remain unchanged

• Equilibrium will shift right

• Equilibrium will become more exothermic

CO_2(g) + CaO_(s) 🡨🡪 CaCO_3(s)       (exothermic) 

The reaction is cooled.

What happens to Equilibrium?

• Equilibrium will shift left

• Equilibrium will remain unchanged

• Equilibrium will shift right

• Equilibrium will become more exothermic