Skip to content

Course home

Calculations involving masses

Calculations involving masses

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139
Question 85

An industrial chemist synthesises a sample of hydrated zinc sulfate crystals, ZnSO4⋅7H2O\text{ZnSO}_4 \cdot 7\text{H}_2\text{O}ZnSO4​⋅7H2​O, by reacting excess zinc carbonate with dilute sulfuric acid.

After filtration, crystallisation, and drying, the mass of the pure crystals obtained is significantly lower than the theoretical maximum mass calculated from the limiting reactant.

Give two distinct practical reasons why the percentage yield of these dry crystals is less than 100%.

[2]
Markscheme

Calculations involving masses Questions

  1. GCSE
  2. /Chemistry
  3. /Calculations involving masses

258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank