HMH Unit 5 Lesson 2 Reaction Kinetics Discussion

HMH Unit 5 Lesson 2
Reaction Kinetics Discussion

Multiple Choice

What is the study of reaction kinetics?

• The study of the rates at which chemical reactions occur.
• The study of ancient civilizations
• The study of outer space
• The study of plant biology

​How does a reaction happens?

Multiple Choice

What is collision theory?

• A theory that explains how chemical reactions occur and why reaction rates differ for different reactions.
• A theory that explains how planets collide in space
• A theory that explains how to prevent objects from colliding with each other
• A theory that explains how to avoid collisions while driving

​Collision Theory

• ​particles must collide

• collision must have enough enenrgy (Activation Energy)

• correct orientation

Multiple Choice

What are some ways that scientists can affect the rate of reactions?

• By adding more water to the reaction
• By reducing the pressure of the reaction environment
• By increasing the volume of the reactants
• By changing temperature, concentration, surface area, and using catalysts

Open Ended

How does changing the concentration change the rate of reaction?

​Changing Concentration

Open Ended

How does change the temperature affect reaction rates?

​Temperature

​Increase temperature →more kinetic energy → more possible collision with more energy to overcome activation energy

​Decrease temperature →less kinetic energy → less possible collision with less energy to overcome activation energy

Open Ended

How does surface area affect reaction rates?

​Surface Area

​More surface area → more area for collision → more collision

​Less surface area → Less area for collision → Less collision

Open Ended

Why do you have to strike a match to get the reaction going?

Multiple Choice

Activation Energy. What is Activation Energy?

• Minimum energy required to start a chemical reaction
• The energy stored in chemical bonds
• The energy required to stop a chemical reaction
• The energy released during a chemical reaction

​Showing Activation Energy

​The larger the activation energy, the harder it is for a reaction to start or continue.

The ower the activation energy, the easier it is for a reaction to start or continue.

Multiple Choice

How does a catalyst work?

• By increasing the activation energy required for the reaction to take place
• By slowing down the reaction and preventing it from occurring
• By changing the chemical composition of the reactants
• By providing an alternative pathway for the reaction to occur, lowering the activation energy required for the reaction to take place.

​Catalyst

• ​lower the activation energy

• make it easier to work

• chemistry-catalyst

• biology-enzyme