Skip to content

Course home

Sign up

3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

EasyMediumHard
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556
Question 14

Calcium reacts with water to produce calcium hydroxide and hydrogen.

A student wrote this equation for the reaction:

Ca+H2O→CaOH+H2\text{Ca} + \text{H}_2\text{O} \rightarrow \text{CaOH} + \text{H}_2Ca+H2​O→CaOH+H2​

Which correction should the student make?

[1]
A

Replace CaOH\text{CaOH}CaOH with Ca(OH)2\text{Ca(OH)}_2Ca(OH)2​, then put 2 before H2\text{H}_2H2​.

B

Keep CaOH\text{CaOH}CaOH, then put 2 before Ca\text{Ca}Ca, H2O\text{H}_2\text{O}H2​O and CaOH\text{CaOH}CaOH.

C

Replace CaOH\text{CaOH}CaOH with Ca(OH)2\text{Ca(OH)}_2Ca(OH)2​, then put 2 before H2O\text{H}_2\text{O}H2​O.

D

Replace CaOH\text{CaOH}CaOH with Ca(OH)2\text{Ca(OH)}_2Ca(OH)2​, then put 2 before H2O\text{H}_2\text{O}H2​O and H2\text{H}_2H2​.

Markscheme

3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations Questions

  1. GCSE
  2. /Chemistry
  3. /3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

95 exam-style questions on AQA GCSE Chemistry 3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, covering 3.1.1 Conservation of mass and balanced chemical equations, 3.1.2 Relative formula mass, 3.1.3 Mass changes when a reactant or product is a gas, and 3.1.4 Chemical measurements. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank