Chemical reactions

Question 1

Physical change

Answer 1

Matter changes state but no new substance formed

Question 2

Chemical change

Answer 2

Chemical reaction occurs + new substance is formed

Question 3

Reactants

Answer 3

Substances used by the reaction

Question 4

Products

Answer 4

The substances produced by the reaction

Question 5

Exothermic

Answer 5

A reaction that releases heat
Ex = exit

Question 6

Endothermic

Answer 6

A reaction that takes in heat
En = enter

Question 7

Law of conservation of mass

Answer 7

Matter cant be created or destroyed only changed

Question 8

Activation energy

Answer 8

The minimum amount of energy required for a reaction to take place

Question 9

Catalyst

Answer 9

A chemical that speeds up a chemical reaction without being used up itself

Question 10

Evidence of a chemical reaction

Answer 10

Light given out
Heat given out/in
Gas made
Sound made
Gers cloudy

Question 11

How are chemical reactions written

Answer 11

Reactants - - - - - - - - > Products
Vinegar+baking soda—>CO²+salt water