GCSE Reactions

Question 0

Metal oxide+acid->

Answer 0

Salt+water

Question 1

Metal+acid->

Answer 1

Soluble salt+hydrogen

Question 2

Metal carbonate+acid->

Answer 2

Salt+water+carbon dioxide

Question 3

Ions+ions->

Answer 3

Insoluble salt

Question 4

Acid+insoluble base->

Answer 4

Soluble salt

Question 5

Acid+alkali->

Answer 5

Soluble salt+water

Question 6

Is combustion exo or endothermic?

Answer 6

Exothermic

Question 7

Is neutralisation exo or endothermic?

Answer 7

Exothermic

Question 8

Is oxidation exo or endothermic?

Answer 8

Exothermic

Question 9

Is thermal decomposition exo or endothermic?

Answer 9

Endothermic

Question 10

Hard water+soap->

Answer 10

Scum

Question 11

Temporary hard water has ? In it that decompose on heating to make ? Which react with Ça and Mg

Answer 11

HCO3- ions…..=carbonate ions (Mg/Ça carbonate=precipitates)

Question 12

Heating hard water=

Answer 12

Scale

Question 13

Sodium carbonate+ Mg or Ca->

Answer 13

CaCO3 or MgCO3

Question 14

Flame tests:
Green-
Potassium-
Lithium-
Calcium-
Sodium-

Answer 14

Green- barium
Lilac-potassium
Crimson-lithium
Red-calcium
Yellow-sodium

Question 15

Ion tests:
In sodium hydroxide...
- white precipitate
-white precipitate+dissolves in excess NaoH
-blue precipitate 
-green precipitate
-brown precipitate

Answer 15

• white precipitate=Al, Ca, Mg
• white precipitate+dissolves in excess NaoH=Aluminium hydroxide
• blue precipitate =copper
• green precipitate =ironII
• brown precipitate =iron III

Question 16

Ion test
In silver nitrate solution+dilute nitric acid...
-white precipitate
-cream precipitate
-yellow precipitate

Answer 16

• white precipitate-silver CHLORIDE
• cream precipitate- silver BROMIDE
• yellow precipitate- silver IODIDE

Question 17

Ion test
In barium chloride solution+dilute HCl…
-White precipitate=

Answer 17

-white precipitate=sulfate ions

Question 18

Nitrogen+hydrogen

Give reaction conditions

Answer 18

Ammonia
450'C
Iron catalyst
200 atmospheres
Cooled, ammonia liquefies, removed, H+N are recycled

Question 19

Alcohol+water=

Answer 19

A neutral solution

Question 20

Alcohol+sodium=

Answer 20

Hydrogen

Question 21

Ethanol+chemical oxidising agents/microbial action->

Answer 21

Ethanoic acid

Question 22

Carboxylic acid+water=

Answer 22

Acidic solution

Question 23

Carboxylic acid+carbonate=

Answer 23

Carbon dioxide

Question 24

Carboxylic acid+alcohol (+acid catalyst)=

Answer 24

Esters

Question 25

Ethanol+ethanoic acid=

Answer 25

Ethyl ethanoate

Question 26

Ammonia+water=

Answer 26

Alkaline solution

Question 27

Hydrocarbons, metal extraction

Answer 27

Hydrocarbons

Question 28

Combustion of hydrocarbons

Answer 28

Carbon and hydrogen are oxidised...it releases energy

Question 29

Cracking hydrocarbons

Answer 29

Heat, vaporise, pass over hot catalyst/ Mix with steam, heat to high temperature for thermal decomposition

Question 30

Alkenes effect on bromine water

Answer 30

Orange to colourless

Question 31

Polymerisation

Answer 31

Many monomers join together from alkenes to alkanes

Question 32

How to make ethanol

Answer 32

Hydration of ethene with steam and catalyst Or Yeast turns sugar into CO2 and ethanol

Question 33

How to harden vegetable oils

Answer 33

Unsaturated hydrocarbons reacted with hydrogen with a nickel catalyst at 60'C (hydrogen added to carbon=carbon bonds)