9.1 Practice Quiz: Kinetics

Which best defines "reaction rate"?

• Concentration change per unit time
• How long a reaction takes
• Adding a catalyst
• Combining reactants with products

Tags

NGSS.HS-PS1-5

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

• Catalyst
• Acid
• Base
• pressure

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NGSS.HS-PS1-5

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

Decreasing the particle size increases the reaction rate because

• It makes particles move faster
• It increases the likelihood of collisions with the correct geometry
• It decreases the surface area available to react
• It increases the number of collisions

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

In an endothermic reaction the products have 

• more energy than the reactants
• less energy than the reactants
• the same energy as the reactants
• no energy

Tags

NGSS.HS-PS1-4

In an exothermic reaction the products have

• more energy than the reactants
• the same energy as the reactants
• less energy than the reactants
• no energy

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

How do catalysts increase the rate of reaction?

• The frequency of collisions is the increased
• the activation energy is lowered
• the energy of collisions is increased
• Both the frequency and energy of collisions is increased

Tags

NGSS.HS-PS1-5

How does a catalyst change during a reaction?

• It is part of the products
• It combines with the reactants
• It precipitates
• It remains unchanged