Year 9 Chemistry Quiz

Which of the following is a compound?

• Oxygen (O₂)

• Iron (Fe)

• Water (H₂O)

• Nitrogen (N₂)

Which is the correct balanced form of this equation? __ H₂ + __ O₂ → __ H₂O

• 2H₂ + O₂ → 2H₂O

• H₂ + O₂ → H₂O₂

• H₂ + 2O₂ → H₂O

• 2H₂ + 2O₂ → H₂O₂

What is the correct word equation for this reaction? Na + Cl₂ → NaCl

• Sodium + Chlorine → Sodium chloride

• Sodium chloride → Sodium + Chlorine

• Sodium + Chlorine → Sodium + Chloride

• Sodium + Chloride → Sodium chlorine

Which reaction is exothermic?

• Melting ice

• Boiling water

• Burning wood

• Photosynthesis

Which reaction is endothermic?

• Combustion of petrol

• Respiration

• Rusting of iron

• Photosynthesis

Which of these is the general word equation for complete combustion of a hydrocarbon?

• Fuel + Oxygen → Carbon dioxide + Water

• Fuel + Carbon dioxide → Oxygen + Water

• Fuel + Water → Oxygen + Carbon dioxide

• Oxygen + Carbon dioxide → Fuel + Water

Rusting of iron is an example of:

• Combustion

• Oxidation

• Neutralisation

• Precipitation

Which of the following best describes an acid?

• Tastes bitter, feels slippery, pH > 7

• Tastes sour, reacts with metals, pH < 7

• Does not react with metals, neutral pH 7

• Always solid and unreactive

Which of the following is the correct balanced equation for the reaction of calcium carbonate with hydrochloric acid?

• CaCO₃ + HCl → CaCl₂ + H₂O + CO₂

• CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

• CaCO₃ + 2HCl → CaCl + H₂ + CO₂

• CaCO₃ + HCl → Ca + Cl₂ + CO₂

A student adds universal indicator to a solution and it turns purple. What does this result show?

• The solution is strongly acidic (pH 1–3)

• The solution is neutral (pH 7)

• The solution is strongly basic/alkaline (pH 12–14)

• The solution is weakly acidic (pH 5–6)