Skip to content

Course home

Sign up

3.1 Introducing chemical reactions

EasyMediumHard
12345678910111213141516171819202122232425262728
Question 14
H

A student heats 5.02 g of zinc carbonate, ZnCO3\mathrm{ZnCO_{3}}ZnCO3​, in an open boiling tube until the mass stops changing.

ZnCO3→ZnO+CO2 \mathrm{ZnCO_{3} \rightarrow ZnO + CO_{2}} ZnCO3​→ZnO+CO2​

What is the decrease in mass of the boiling tube and its contents?

Relative atomic mass (ArA_rAr​): C = 12.0 O = 16.0 Zn = 65.4

[1]
A

0.00 g

B

1.76 g

C

1.12 g

D

3.26 g

Markscheme

3.1 Introducing chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.1 Introducing chemical reactions

55 exam-style questions on OCR GCSE Chemistry 3.1 Introducing chemical reactions, covering 3.1.1 Writing formulae and balanced chemical equations, 3.1.2 Formulae of compounds from ions, and state symbols, 3.1.3 Conservation of mass and observed changes in mass, 3.1.4 Half equations and balanced ionic equations, 3.1.5 The mole and the Avogadro constant, and 3.1.6 Stoichiometry, limiting reactants and reacting masses. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank