Common substances at GCSE

Question 1

What is the formula and state symbol for water

Answer 1

H₂O

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 calciu m 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