Chemical Changes and Temperature

The rate of a chemical reaction is NOT affected by which of the following:

• temperature

• particle size (surface area)

• concentration

• All of these affect reaction rates

Tags

NGSS.HS-PS1-5

A temperature increase causes the particles ......

• to slow down

• collide higher

• move faster

• in the right order

Tags

NGSS.HS-PS1-5

What is the rate of reaction?

• How fast a reaction is

• How loud a reaction is

• How big a reaction is

• How much gas a reaction produces

Tags

NGSS.HS-PS1-5

Products will form faster if____________

• the particle size of the reactants are larger.

• concentration of the reactants are increased.

• temperature is decreased.

• the reaction is not stirred.

Tags

NGSS.HS-PS1-5

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

• Red, because the activation energy is larger

• both reaction progress at the same rate

• Blue, because the activation energy is lower

Tags

NGSS.HS-PS1-4

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

• concentration

• temperature

• surface area

• reactants

Tags

NGSS.HS-PS1-5

Which factors increase the rate of a reaction?

• increasing temperature

• increasing surface area

• increasing concentration

• All of these

Tags

NGSS.HS-PS1-5

Why does breaking up a solid reactant increase the rate of reaction?

• it creates more solid

• it increases the surface area

• it creates more energy

• it increases the concentration

In an exothermic reaction, heat is ...

• taken in

• given out

Tags

NGSS.HS-PS1-4

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it increases the energy of particle collisions

• it lowers the activation energy

• it increases the frequency of particle collisions

Tags

NGSS.HS-PS1-5