AQA GCSE Chemistry

Topic Questions

3.1 Measurement, Mass & Equations

1
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1 mark

What numbers will balance the following equation?

_Fe (s) + _O2 (g) → _Fe2O3 (g)

  • 2,3,4

  • 4,3,2

  • 2,3,1

  • 1,2,3

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2
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1 mark

A company produces tin from an ore called cassiterite, which is mainly tin oxide.

What is the relative formula mass (Mr) of tin oxide, SnO2?

Relative atomic masses (Ar):   Sn= 119 O= 16

  • 135

  • 151

  • 270

  • 1904

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3
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1 mark

The company calculates that the ore cassiterite contains 79% tin oxide, SnO2.

How much tin oxide can be extracted from 1.2 kg of cassiterite?

  • 0.948 kg

  • 1.51 kg

  • 65.8 kg

  • 948 kg

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41 mark

A piece of iron wool is left in moist air and goes rusty.

Which graph shows how the mass of the iron wool changes? PsUTFk6C_q4

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51 mark

What is the reading and uncertainty on this 50 ml measuring cylinder?

q5

  • 23 ±1 ml

  • 26 ± 1 ml

  • 26 ± 2 ml

  • 26 ± 4 ml

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