Science Midterm Chapter 12

Question 1

What do we call the process by which atoms of two or more substances rerange to form one or more new substances

Answer 1

Chemical reaction

Question 2

What is not evidence of a chemical change

Answer 2

Change in shape

Question 3

Which one of these represents a chemical equation (H2O, H, Hydrogen has 1 valence electron, or 2H2 + O2 –> 2H2O)

Answer 3

2H2 + O2 –> 2H2O

Question 4

The substances produced by the chemical reaction are called

Answer 4

products

Question 5

The reason you will always have the same elements on both sides of the yield sign in a chemical equation is because of which law

Answer 5

The law of conservation of matter

Question 6

A chemical reaction in which the substance combines with oxygen and releases energy is named

Answer 6

combustion

Question 7

Reactions that absorb energy

Answer 7

Endothermic reaction

Question 8

Because they keep food from spoiling so soon, preservatives in foods are considered

Answer 8

Inhibitors

Question 9

Enzymes are considered natural

Answer 9

Catalysts