Changes in Matter

Question 1

All changes in matter involve…

Answer 1

energy

Question 2

What are the 3 types of changes?

Answer 2

Physical, chemical, and nuclear

Question 3

Physical Change

Answer 3

will change the appearance of a material WITHOUT changing the composition
-can be either reversible or irreversible
Ex: freezing/melting (reversible), breaking glass (irreversible)

Question 4

Chemical Change

Answer 4

will change the appearance of the material by changing the composition of the material
Ex: rusting, decomposing, fermenting, burning

Evidence of chemical change: temperature change, energy (heat, light, sound) produced

Question 5

All physical and chemical changes must obey…

Answer 5

The Law of Conservation of Matter (Mass)

Question 6

The law of conservation of matter

Answer 6

Matter can not be created or destroyed during any physical or chemical change

Question 7

Reactant(s)

Answer 7

The input(s) of a reaction

Question 8

Product(s)

Answer 8

the output(s) of a reaction

Question 9

Nuclear Change

Answer 9

Change in the composition of the nucleus of an atom (Protons & Neutrons)

Question 10

If Hp (energy of products) < Hr (energy of reactants)

Answer 10

Energy was released during the reaction

EXOTHERMIC reaction

Question 11

If Hp (energy of products) > Hr (energy of reactants)

Answer 11

Energy was added/absorbed during the reaction

ENDOTHERMIC reaction