9.1.4 — Chemical Properties: Past Paper Exam
Word Equations · Papers 3 & 4 Style · 15 Questions · 43 Total Marks
Section A: Acid Reactions
Iron filings are added to dilute sulfuric acid in a test tube. Bubbles are observed.
Name the gas produced when iron reacts with dilute sulfuric acid.
Zinc granules are placed into dilute hydrochloric acid.
Write the word equation for the reaction between zinc and dilute hydrochloric acid.
Calcium carbonate is added to dilute hydrochloric acid. A gas is produced that turns limewater milky.
(a) Name the gas produced. (b) Write the word equation for this reaction.
Copper(II) oxide powder is stirred into warm dilute sulfuric acid until it dissolves.
Write the word equation for this reaction. State the type of reaction occurring.
A student adds magnesium ribbon to excess dilute nitric acid.
(a) Name the salt produced. (b) Write the word equation. (c) What observation would the student make?
Section B: Oxygen & Water Reactions
A strip of magnesium ribbon is burned in a Bunsen burner flame in air.
Complete the word equation: Magnesium + Oxygen →
A small piece of sodium is placed on the surface of water in a trough. It fizzes vigorously, melts into a ball, and moves rapidly across the surface.
Name the alkaline product formed when sodium reacts with water.
Sulfur is burned completely in excess oxygen.
(a) Write the word equation. (b) Is the oxide formed acidic, basic, or neutral? (c) What happens when this oxide is dissolved in water?
Potassium is a Group 1 metal, more reactive than sodium.
Write the word equation for the reaction of potassium with water, and state two observations.
Carbon is burned in a limited supply of oxygen inside a sealed container.
Write the word equation for the incomplete combustion of carbon.
Section C: Identifying Oxides
A student burns several elements in oxygen and dissolves the products in water.
Are the oxides formed by metals generally acidic or basic? Give one example to support your answer.
Nitrogen dioxide (NO₂) is a reddish-brown gas produced by lightning and car engines.
Is nitrogen dioxide an acidic, basic, or neutral oxide? Explain your answer.
A student dissolves carbon dioxide in water and tests the resulting solution with universal indicator.
(a) What colour would the universal indicator turn? (b) Name the acid formed. (c) Write the word equation for this reaction.
Amphoteric oxides are a Supplement topic. Aluminium oxide (Al₂O₃) is an amphoteric oxide.
[Supplement] Explain what is meant by an 'amphoteric oxide'. Give evidence from the reactions of aluminium oxide.
A chemistry student is given five white powders: sodium oxide, sulfur trioxide, iron(III) oxide, phosphorus pentoxide, and aluminium oxide.
[Extended Question] Classify each oxide as acidic, basic, or amphoteric. Then describe one chemical test the student could use to distinguish an acidic oxide from a basic oxide.
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🔑 Key Pattern: The Word Equation Formula
Metal + Acid → Salt + Hydrogen
Metal Oxide + Acid → Salt + Water (Neutralisation)
Metal + Oxygen → Metal Oxide (Basic)
Non-metal + Oxygen → Non-metal Oxide (Acidic)
Group 1 Metal + Water → Metal Hydroxide + Hydrogen
Metal Carbonate + Acid → Salt + Water + Carbon Dioxide
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