0893 Science Past Papers May 2026

A student investigates how temperature affects the rate of reaction between hydrochloric acid and magnesium.
a) Name the independent variable. [1]
b) Suggest one variable they should keep constant. [1]
c) Describe how they could measure the rate of reaction. [2]

(Mark scheme gives credit for "temperature", "volume/conc. of acid", and "time to see effervescence stop / collect gas volume per minute".) 0893 Science Past Papers

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Question (Physics - Energy):
A student rolls a toy car down a ramp. The car travels 2 meters in 4 seconds. Calculate its average speed. Give the unit. A student investigates how temperature affects the rate

Common Wrong Answer: "0.5" (missing units and formula confusion).
Correct Answer (per mark scheme): Speed = distance / time = 2 m / 4 s = 0.5 m/s (1 mark for calculation, 1 mark for correct unit). (Mark scheme gives credit for "temperature", "volume/conc

Lesson from the mark scheme: You lose the mark for forgetting the unit. Always re-read the question’s request for "the unit."

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