Acids

Question 1

What does oxidising mean

Answer 1

Provides oxygen which allows other materials to burn more quickly
E.g liquid oxygen

Question 2

What does harmful mean

Answer 2

Like toxic but not as dangerous

Eg cooper Sulfate

Question 3

What does highly flammable mean

Answer 3

Catches fire easily

Petrol

Question 4

What does irritant mean

Answer 4

Not corrosive but can cause reddening or blistering on the skin
Eg bleach

Question 5

What does toxic mean

Answer 5

Can cause death either by swallowing breathing in or absorption through the skin eg hydrogen cyanide

Question 6

What does corrosive mean

Answer 6

Attacks and destroys living tissues
Including eyes and skin
Eg concentrated sulfur in acid

Question 7

What is an acid

Answer 7

A substance with a ph less than 7 
Stomach acid
Vinegar
Acid rain
Normal rain

Question 8

What is an alkali

Answer 8

A substance with a ph greater than 7 
A base that dissolves in water 
Washing up liquid 
Pancreatic juice
Soap powder
Ammonia 
Oven cleaner 
Caustic soda

Question 9

What is a neutralisation reaction

Answer 9

Acid + base -> salt + water

When an acid and base react they form a salt and water and the products are neutral

Question 10

What are the products of neutralisation reactions used for

Answer 10

Salts are used in fertilisers

They are used in fireworks as colouring agents

Question 11

What is stomach acid

Answer 11

It is hcl in the stomach 
It helps with digestion 
Because the enzymes that work in the stomach work best in acidic conditions  
Helps to kill microbes and bacteria
Can cause indigestion

Question 12

How do indigestion tablets work

Answer 12

They contain bases such as calcium carbonate which can neutralise some of the stomach acid and stop indegestion

Question 13

Acid + metal oxide

Answer 13

Salt and water

Question 14

Acid + metal hydroxide

Answer 14

Salt + water

Question 15

Hydrochloride acid + copper oxide

Answer 15

Copper chloride + water

Question 16

Hydrochloric acid + sodium hydroxide

Answer 16

Sodium chloride and water

Question 17

Sulfuric acid + zinc oxide

Answer 17

Zinc Sulfate + water

Question 18

Sulfuric acid + calcium hydroxide

Answer 18

Calcium Sulfate + water

Question 19

Nitric acid + magnesium oxide

Answer 19

Magnesium Nitrate + water

Question 20

Nitric acid + potassium hydroxide

Answer 20

Potassium nitrate+ water

Question 21

Formula for sulfuric acid

Answer 21

H2SO4

Question 22

Formula for nitric acid

Answer 22

HNO3

Question 23

What are the state symbols for a neutralisation reaction

Answer 23

Aq
Aq
Aq
L (water)

Question 24

Acid + metal carbonate

Answer 24

Salt + water + carbon dioxide

Question 25

Hydrochloric acid + sodium carbonate

Answer 25

Sodium chloride + water + carbon dioxide 2hcl + Na2CO3 ->2Nacl + H2O + CO2

Question 26

Hydrochloric acid + calcium carbonate

Answer 26

Calcium chloride + water + carbon dioxide

Question 27

What is electrolysis

Answer 27

Decomposition of a compound using electrical energy from a dc source A liquid is required to carry the current called the electrolyte Electricity is applied by two electrodes

Question 28

What happens in the electrolysis of hydrochloric acid

Answer 28

Hcl is the electrolyte It is split into hydrogen and chlorine gas The gases bubble and can be collected in test tubes at the electrodes Hydrogen at the cathode Chlorine at the anode

Question 29

What is the test for chlorine

Answer 29

Put damp blue litmus paper in the test tube and chlorine will bleach it and turn it white

Question 30

What is the test for hydrogen

Answer 30

When a lit splint is put into hydrogen it creates a squeaky pop test

Question 31

Happens in the electrolysis of sea water

Answer 31

Sodium chloride solution is decomposed | It creates chlorine gas

Question 32

What are the uses of chlorine

Answer 32

Used to treat water supplies Used in manufacture of bleach Used to make polychloroethene (pvc)

Question 33

What happens in the electrolysis of water

Answer 33

Hydrogen gas and oxygen gas are produced

Question 34

What is the test for oxygen

Answer 34

If a glowing splint is put into the oxygen it will relight