Reactions, Equations and Formulae 01

1. Which of the following metals do NOT react with water or steam?

   • Aluminium
   • Copper
   • Tin
   • Zinc

2. Which of the following metals is the most reactive with acids?

   • Aluminium
   • Iron
   • Magnesium
   • Zinc

3. The formula for potassium nitrate is KNO₃. This means .......

   • 1 potassium atom, 1 nitrogen atom, 3 oxygen atoms
   • 1 potassium atom, 3 nitrogen atoms, 3 oxygen atoms
   • 3 potassium atoms, 3 nitrogen atoms, 3 oxygen atoms
   • 3 potassium atoms, 3 nitrogen atoms, 9 oxygen atoms

4. The formula for calcium hydroxide is Ca(OH)₂. This means .......

   • 1 calcium atom, 1 oxygen atom, 2 hydrogen atoms
   • 1 calcium atom, 2 oxygen atoms, 1 hydrogen atom
   • 1 calcium atom, 2 oxygen atoms, 2 hydrogen atoms
   • 2 calcium atoms, 2 oxygen atoms, 2 hydrogen atoms

5. The formula for copper nitrate is Cu(NO₃)₂. This means .......

   • 1 copper atom, 1 nitrogen atom, 6 oxygen atoms
   • 1 copper atom, 2 nitrogen atoms, 3 oxygen atoms
   • 1 copper atom, 2 nitrogen atoms, 6 oxygen atoms
   • 2 copper atoms, 2 nitrogen atoms, 6 oxygen atoms

6. 2H₂SO₄ means 2 molecules of sulphuric acid. They contain .......

   • 2 hydrogen atoms, 1 sulphur atom, 4 oxygen atoms
   • 4 hydrogen atoms, 1 sulphur atom, 4 oxygen atoms
   • 4 hydrogen atoms, 2 sulphur atoms, 8 oxygen atoms
   • 4 hydrogen atoms, 4 sulphur atoms, 8 oxygen atoms

7. During a chemical reaction new substances are formed from old ones. Which of the following is NOT true?

   • New substances can be changed back to the original ones
   • The total mass of products = total mass of reactants
   • There is often a colour change
   • There is often a temperature change

8. In the following reaction which are the products Mg + 2HCl → H₂ + MgCl₂?

   • Hydrochloric acid and magnesium chloride
   • Hydrogen and magnesium chloride
   • Magnesium and hydrochloric acid
   • Magnesium and hydrogen

9. Which of the following is the correct balanced equation?

   • 2 Cu + O₂ → Cu₂O₂
   • 2 Cu + O₂ → 2 CuO
   • Cu + O → CuO
   • Cu + O₂ → CuO₂

10. When zinc carbonate reacts with dilute hydrochloric acid the products are .......

    • carbon dioxide, water
    • zinc chloride, carbon dioxide
    • zinc chloride, carbon dioxide, water
    • zinc sulphate, carbon dioxide, water

Quiz written by Sue Davison