Common substances at GCSE

Question 1

What is the formula and state symbol for water

Answer 1

H₂O (l)

Question 2

What is the formula and state symbol for hydrogen gas?

Answer 2

H₂ (g)

Question 3

What is the test for Hydrogen gas (test 1 mark / positive result 1 mark)

Answer 3

Add a lighted splint and it makes a squeaky pop

Question 4

What is the formula and state symbol for oxygen gas?

Answer 4

O₂ (g)

Question 5

What is the test for oxygen gas? (test 1 mark / positive result 1 mark)

Answer 5

Add a glowing splint and the splint relights

Question 6

What is the formula and state symbol for carbon dioxide at room temperature?

Answer 6

CO₂ (g)

Question 7

What is the test for carbon dioxide gas (1 mark for test / 1 mark for positive result)

Answer 7

Bubble the gas through lime water which will go cloudy if the gas is carbon dioxide

Question 8

What is the formula and state symbol for Chlorine at room temperature?

Answer 8

Cl₂ (g)

Question 9

What is the name, formula and state symbol for the gas that comes out of the gas taps ?

Answer 9

Methane CH₄ (g)

Question 10

Calcium carbonate has the formula CaCO₃. Which atoms and how many of them are in calcium carbonate?

Answer 10

Calcium (Ca) x 1

Carbon (C) x 1

Oxygen (O) x 3

Question 11

Sodium chloride is table salt. Give the fromula and state symbol for table salt

Answer 11

NaCl (s)

Question 12

Table salt dissolves in water to give salt solution. Give the formula and state symbol for salt solution

Answer 12

NaCl (aq)

Question 13

Copper sulpate forms blue crystals. Give the formula and state symbol for copper sulphate crystals

Answer 13

CuSO₄ (s)

Question 14

What elements and how many of them are in Copper sulphate CuSO₄

Answer 14

Copper (Cu) x 1

Sulphur (S) x 2

Oxygen (O) x 4

Question 15

What ions and how many of them are in copper sulphate CuSO₄

Answer 15

Copper ions Cu²⁺ x 1

Sulphate ions SO₄^2- x 1

Question 16

Hydrochloric acid is a common name. We should call hydrochlroic acid hydrogen chloride. Give the formula and state symbol for hydrochloric acid

Answer 16

HCl (aq)

Question 17

Ammonia is a common gas at GCSE which contains nitrogen and hydrogen. What is the formula state symbol of ammonia

Answer 17

NH₃ (g)

Question 18

What is the formula and state symbol for carbon monoxide

Answer 18

CO (g)

Question 19

What is the balanced equation with state symbols for burning carbon to give carbon dioxide

Answer 19

C (s) + O₂ (g) –> CO₂ (g)

Question 20

What is the balanced equation with state symbols for sodium metal reacting with chlorine gas to make sodium chloride?

Answer 20

2Na (s) + Cl₂ (g) –> 2NaCl (s)

Question 21

What colour is copper sulphate solution

Answer 21

Blue

Question 22

Describe what sodium chloride solution looks like

Answer 22

A colour less solution

Question 23

Describe what Hydrogen gas is like

Answer 23

A colourless gas which is lighter than air

Question 24

Describe what magnesium metal looks like

Answer 24

A silver metal

Question 25

Describe what copper metal looks like

Answer 25

An orange metal

Question 26

What is the formula and state symbol for ammonia?

Answer 26

NH₃ (g)

Question 27

Name a very reactive metal

Answer 27

Sodium or lithium or potassium

Question 28

Name a very reactive non-metal

Answer 28

Fluorine, chlorine, bormine, iodine

Question 29

What is the formula and state symbol for magnesium oxide

Answer 29

MgO (s)

Question 30

Write a balanced symbol equation with state symbols for the reaciton of magnesium metals with oxygen to make magnesium oxide

Answer 30

2Mg (s) + O₂ (g) –> 2MgO (s)