bellringer 2.4 biology

Question 1

the elements or compounds produced by a chemical reaction are known as_______.

Answer 1

Products

Question 2

Chemical reactions always involve a change in_______.

Answer 2

energy

Question 3

the energy that is needed to get a reaction started is called_______.

Answer 3

the activation energy

Question 4

all enzymes are______.

Answer 4

catalysts

Question 5

after a reaction takes place the enzyme is_____ and ready to accept molecules.

Answer 5

unchanged

Question 6

_______ speed up chemical reactions that take place.

Answer 6

Enzymes

Question 7

if reactants don’t have enough energy, they will be______ after the collision.

Answer 7

unchanged

Question 8

elements or compounds that enter into a chemical reaction are called________.

Answer 8

reactants

Question 9

enzymes affect the reactions in living cells by changing the ______ of the reaction.

Answer 9

speed

Question 10

a substance that accelerates the rate of a chemical reaction is called a_______.

Answer 10

catalysts