Reactions and Reaction Rates

In an exothermic reaction, heat is ...

• taken in
• given out

Tags

NGSS.HS-PS1-4

In an endothermic reaction, heat is 

• taken in
• given out

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

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

• concentration
• surface area
• temperature
• reactants

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

Which of the following slows down the rate of a chemical reaction?

• Place the reactants in hot water
• Place the products in ice bath
• Place the reactants in a ice bath
• Keep stirring the reactants with a stirring rod

Tags

NGSS.HS-PS1-5

In a chemical reaction, if the reactants are heated, the reaction usually happens

• Faster
• Slower
• At the same rate
• In a smaller volume

Tags

NGSS.HS-PS1-5

Some chemical reactions require a substance called a catalyst. The main purpose of a catalyst is

• To warm up the reaction
• To speed up the reaction
• To create more reactants
• To stop the reaction

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

• larger
• smaller

Tags

NGSS.HS-PS1-5

Exothermic reactions release heat to the surroundings.

• true
• false

Tags

NGSS.HS-PS1-4