Rates

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

• false 

• true

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

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it lowers the activation energy

• it increases the energy of particle collisions

• it increases the frequency of particle collisions because there are more collision sites

Tags

NGSS.HS-PS1-5

Which factors affect the rate of a reaction?

• temperature

• concentration

• surface area

• pressure

• catalyst

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

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

In which experiment is the rate of reaction between hydrochloric acid and calcium carbonate slowest? 

• A

• B

• C

• D

Tags

NGSS.HS-PS1-5

When we investigate the rate of reaction we are looking at the...

• amount of product formed

• speed of reaction

• concentration of reacting particles

• combining reactants with products

Tags

NGSS.HS-PS1-5

What is the energy of the activated complex?

• 75 kJ

• 225 kJ

• 300 kJ

• 225 kJ

Tags

NGSS.HS-PS1-4

Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions

• it only increases the frequency of particle collisions

• it only increases the energy of particle collisions

• it reduces the activation energy of the reaction

Tags

NGSS.HS-PS1-5