3.1

Question 1

Exothermic

Answer 1

Energy is being released from reaction

Question 2

Endothermic

Answer 2

Energy is being absorbed for the reaction to take place

Question 3

Corrosion

Answer 3

chemical reactions that form other compounds from metals

Question 4

Green verdigris

Answer 4

forms when copper corrodes by reacting with gases in the air

Question 5

Tarnish

Answer 5

Forms when pure silver reacts with sulfur to form black coating

Question 6

Rust

Answer 6

Forms when iron is exposed to oxygen and water (an oxidation reaction)

Question 7

Combustion

Answer 7

occurs whenever something reacts with oxygen gas, burning or exploding

Question 8

Oxidation

Answer 8

when an element reacts with oxygen (e.g. combustion)

Question 9

Hydro Carbons

Answer 9

Mixture of highly combustible chemicals

Question 10

Complete combustion

Answer 10

reactions that need an unlimited supply of oxygen

Question 11

Incomplete combustion

Answer 11

when oxygen supply is restricted in some way, other reactions occur instead