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6.1 Transition metals, alloys and corrosion

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Question 19
H

Brass is an alloy of copper and zinc. A 5.00 g sample of brass is added to excess dilute hydrochloric acid. Only the zinc reacts: Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)\mathrm{Zn(s) + 2HCl(aq) \rightarrow ZnCl_{2}(aq) + H_{2}(g)}Zn(s)+2HCl(aq)→ZnCl2​(aq)+H2​(g) 600 cm3600\,\mathrm{cm^{3}}600cm3 of hydrogen is collected at room temperature and pressure.

What is the percentage by mass of zinc in the brass? (Relative atomic mass: Zn = 65. One mole of any gas occupies 24 000 cm324\,000\,\mathrm{cm^{3}}24000cm3 at room temperature and pressure.)

[1]
A

16.3%

B

32.5%

C

65.0%

D

67.5%

Markscheme

6.1 Transition metals, alloys and corrosion Questions

  1. GCSE
  2. /Chemistry
  3. /6.1 Transition metals, alloys and corrosion

42 exam-style questions on Edexcel GCSE Chemistry 6.1 Transition metals, alloys and corrosion, covering 6.1.1 Properties of transition metals, 6.1.2 Corrosion and its prevention, and 6.1.3 Alloys and the uses of metals. Each one has a worked solution and a mark scheme showing where the marks go.

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