Reaction Rates

What type of reaction is this?

• Endothermic
• Exothermic

Tags

NGSS.HS-PS1-4

What letter represents the activation energy?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-4

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

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

• concentration
• surface area
• temperature
• reactants

Which factors increase the rate of a reaction.

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

Tags

NGSS.HS-PS1-5

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 

• catalyst
• product
• reactant
• solute

Exothermic reactions release heat to the surroundings.

• true
• false

Tags

NGSS.HS-PS1-4

Increasing the concentration of the reactants will slow down the reaction.

• false 
• true

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