0653.C3.1.04 — Construct word equations to show how reactants form products: past paper questions
Real questions on 0653.c3.1.04 — construct word equations to show how reactants form products
The newest 16 of 16 written questions. Open one to see it on the real paper.
- 0653/62 · October/November 2025 · Q3a(vi)[1]
Suggest why in step 6 the test-tube is heated with a blue Bunsen burner flame instead of a yellow flame.
See it on the paper → - 0653/62 · October/November 2025 · Q3a(vii)[1]
Suggest why in step 8 the apparatus is left to cool down before the mass is measured in step 9.
See it on the paper → - 0653/62 · October/November 2025 · Q3b[2]
The student is not sure that all the copper oxide has reacted in the experiment. Describe what the student does after step 9 to check this. Explain your answer. description explanation
See it on the paper → - 0653/62 · October/November 2025 · Q3c[1]
The student repeats the procedure in (a) using a much larger mass of copper oxide. Suggest one advantage of using a larger mass of copper oxide.
See it on the paper → - 0653/62 · October/November 2025 · Q4a(i)[1]
Record in Table 4.1 position p of the metre rule on the pivot.
See it on the paper → - 0653/62 · October/November 2025 · Q4a(ii)[1]
Calculate b using your answer to (a)(i) and the equation shown. b = 50.0 – p Record this value of b in Table 4.1. Table 4.1 a / cm p / cm b / cm 5.0 43.2 6.8 10.0 44.1 5.9 20.0 45.6 4.4 25.0 46.3 3.7 15.0
See it on the paper → - 0653/62 · October/November 2025 · Q4b(i)[2]
On the grid, plot b (vertical axis) against a. Label the axes. 9 8 7 6 5 4 3 0 5 10 15 20 25 30
See it on the paper → - 0653/62 · October/November 2025 · Q4b(ii)[1]
Draw the straight best-fit line.
See it on the paper → - 0653/62 · October/November 2025 · Q4b(iii)[2]
Determine the intercept I of your graph with the vertical axis. Show your working on your graph. I =
See it on the paper → - 0653/62 · October/November 2025 · Q4b(iv)[1]
2500 I – 150 M = g M = Calculate the mass M of the metre rule using your answer to (b)(iii) and the equation shown. (iv)
See it on the paper → - 0653/62 · October/November 2025 · Q4c(i)[2]
Fig. 4.3 shows an enlarged section of the metre rule and the new position of the 50 g mass. NOT TO SCALE 64 65 66 67 68 69 cm 50 g mass Fig. 4.3 Determine the position c of the centre of the 50 g mass on the metre rule. Show your working. c = cm
See it on the paper → - 0653/43 · May/June 2024 · Q5a(i)[2]
Complete the word equations for the following reactions. zinc + + sulfuric acid hydrochloric zinc acid chloride + hydrogen + water
See it on the paper → - 0653/43 · May/June 2024 · Q5a(ii)[2]
Identify two covalent substances shown in the equations in (a)(i).
See it on the paper → - 0653/43 · May/June 2024 · Q5b[2]
A metal carbonate reacts with a dilute acid to form a salt and two other products. Identify the two other products formed in the reaction.
See it on the paper → - 0653/32 · February/March 2024 · Q5c(i)[1]
Carbon dioxide forms during the thermal decomposition of calcium carbonate. Calcium oxide is the other product. Write the word equation for this reaction in the boxes. +
See it on the paper → - 0653/12 · October/November 2023 · Q16[1]
What is the formula of compound X?
See it on the paper →
What examiners said
Most candidates could interpret the information in the question to complete the word equation with the correct reactant and products. Some candidates tried to write the equation using symbols. Candidates are reminded to read the question carefully before answering.
— Examiner report, February/March 2024, 0653/32 Q5(c)(i) (Cambridge)
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