Reaction Rates and Equilibrium

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

Tags

NGSS.HS-PS1-4

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.

Tags

NGSS.HS-PS1-5

A substance that increases speed of chemical reaction without being being changed is called:

• Catalyst
• Acid
• Base
• pressure

Tags

NGSS.HS-PS1-5

The amount of a substance in a given volume.

• concentration
• temperature
• surface area
• catalyst

Tags

NGSS.HS-PS1-5

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

• concentration
• surface area
• temperature
• reactants

Tags

NGSS.HS-PS1-5

Increasing the concentration increases the speed of reaction by

• lowering activation energy
• increasing collisions
• speeding up the reactants
• exposing more reactant

Tags

NGSS.HS-PS1-5

Which factors increase the rate of a reaction.

• increasing temperature
• increasing concentration
• increasing surface area
• all of these

Tags

NGSS.HS-PS1-5

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

• larger
• smaller

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NGSS.HS-PS1-5

Exothermic reactions release heat to the surroundings.

• true
• false

Tags

NGSS.HS-PS1-4

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

• Red, because the activation energy is larger
• Blue, because the activation energy is lower
• both reaction progress at the same rate

Tags

NGSS.HS-PS1-4