Chemistry -2

Question 0

Physical change

Answer 0

A characteristic of matter that you can observe or measure without changing the identity of the matter ( changing the states of matter )

Question 1

Chemical change

Answer 1

A change in matter in which the substances that make up the matter change into other substances with different chemical and physical properties ( foaming, fizzing, temperature, color change, fire)

Question 2

Endothermic

Answer 2

Chemical reactions that absorb thermal energy

Question 3

Exothermic chemical reactions that release thermal energy

Answer 3

chemical reactions that release thermal energy

Question 4

Catalyst

Answer 4

Substances that increases the reaction rate

Question 5

Inhibitor

Answer 5

Substances that decrease the reaction rate

Question 6

Increases reaction rate

Answer 6

Surface area, concentration/pressure, temperature

Question 7

Synthesis

Answer 7

2 or more substances combine to form a new compound Ca+O2 –> CaO

Question 8

Decomposition

Answer 8

One compound breaks down and forms 2 or more substances ALCL3 —> CaO

Question 9

Combustion

Answer 9

A chemical reaction in which a substance combines with oxygen and releases energy CH+O2 —> CO+H2O

Question 10

Single replacement

Answer 10

One element replaces another element in a compound MG+HCI –> MGCI2+H2