Reaction Rates and Activation Energy

Usually lowering the temperature will slow down a reaction.

• false

• true

Tags

NGSS.HS-PS1-5

Catalysts permit reactions to happen with a __________ activiation energy.

• lower

• higher

Tags

NGSS.HS-PS1-4

What type of reaction is this?

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

More collisions correspond to a: 

• Faster reaction rate  

• Slower reaction rate

• Constant reaction rate 

• None of the above

Tags

NGSS.HS-PS1-5

Based on the collision model, the atoms in the top of potential energy ‘’hill’’ are called

• Top of hill

• Activation energy

• Transition state

• Steric factor

An endothermic reaction with high activation energy for the forward reaction is given by the diagram.

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

To measure rate of reaction, we can monitor change in which of the following?

• Reactants only

• Products only

• Reactants or products

Tags

NGSS.HS-PS1-5

4 factors that affects reaction rate.

• temperature

• surface area

• presence of catalyst

• Chemical nature of reactant

• In solid form

Tags

NGSS.HS-PS1-5

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

• increased concentration of reactants

• increased surface area

• increased speed of particles.

• better orientation of reactants

Tags

NGSS.HS-PS1-5

The amount of energy needed to start a chemical reaction is called...?

• Activation Energy

• Endothermic Energy

• Exothermic Energy

• Biochemical Energy