Rate of Reactions Chemistry

Which line shows the reactants with the largest surface area?

• B
• A

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

• Catalyst
• Acid
• Base
• pressure

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

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

Increasing the pressure of a reacting vessel only affects:

• Gaseous reactants
• Solid reactants
• Liquid reactants
• None of the above

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

This helps to speed up a reaction but does not take part in the chemical reaction. 

• coeffiecents
• reactants
• catalyst
• combustion

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

Exposing more particles for collisions is an increase in 

• concentration
• surface area
• temperature
• catalyst

Tags

NGSS.HS-PS1-5