Chemical Reactions

Question 1

Copper in air

Answer 1

2Cu+O2=2CuO

Question 2

Hydrogen in air

Answer 2

2H2+02=2H2O

Question 3

Iron in oxygen

Answer 3

4Fe+302=2Fe2O3

Question 4

Magnesium in oxygen

Answer 4

2Mg+O2=2MgO

Question 5

Thermal decomposition definition

Answer 5

Breaking down a compound (usually a carbonate) using heat

Question 6

Thermal decomposition example

Answer 6

Copper carbonate = Copper oxide+Carbon dioxide

Question 7

Exothermic Reaction

Answer 7

Gives out energy which means they get hotter

Question 8

Endothermic Reaction

Answer 8

Takes in energy which means that they get colder

Question 9

Combustion

Answer 9

A reaction where a substance is burnt in oxygen to form oxides

Question 10

Metal oxides in combustion

Answer 10

Form alkaline solutions

Question 11

Non-metals oxide in combustion

Answer 11

Form acidic solutions

Question 12

Compound combustion

Answer 12

Each element in it combines with oxygen so compounds usually form more than one oxide products

Question 13

Displacement definitions

Answer 13

A more reactive metal will displace or push out another in a compound

Question 14

Neutralization

Answer 14

A reaction where the acidity of a substance is changed. A base can react with an acid and neutralizes it

Question 15

Acid+alkali

Answer 15

Salt+water (sodium chloride+H2O)

Question 16

Acid+metal carbonate

Answer 16

Salt+water+carbon dioxide