Practice questions
A free sample of Brainlag Learn questions. Choose a course, then filter by topic and difficulty. Each question opens in Learn, where it is marked and explained.
1415 questions
| Practice questions | Topic | Difficulty |
|---|---|---|
| Spotting a hydrocarbon | GCSE Chemistry: Organic chemistry | 1 mark |
| Hydrogen atoms in an alkane | GCSE Chemistry: Organic chemistry | 1 mark |
| Carbon atoms in an alkane | GCSE Chemistry: Organic chemistry | 1 mark |
| The formula of an alkane | GCSE Chemistry: Organic chemistry | 1 mark |
| Naming an alkane | GCSE Chemistry: Organic chemistry | 1 mark |
| Homologous series | GCSE Chemistry: Organic chemistry | 1 mark |
| Comparing two fractions | GCSE Chemistry: Organic chemistry | 1 mark |
| Uses of crude oil fractions | GCSE Chemistry: Organic chemistry | 1 mark |
| Where an alkane leaves the column | GCSE Chemistry: Organic chemistry | 1 mark |
| Balancing complete combustion | GCSE Chemistry: Organic chemistry | 2 marks |
| Products of combustion | GCSE Chemistry: Organic chemistry | 1 mark |
| The missing product of cracking | GCSE Chemistry: Organic chemistry | 3 marks |
| How and why alkanes are cracked | GCSE Chemistry: Organic chemistry | 1 mark |
| The bromine water test | GCSE Chemistry: Organic chemistry | 3 marks |
| Naming an alkane and its formula | GCSE Chemistry: Organic chemistry | 5 marks |
| Comparing two hydrocarbons | GCSE Chemistry: Organic chemistry | 5 marks |
| Crude oil: fuel or feedstock? (6 marks) | GCSE Chemistry: Organic chemistry | 6 marks |
| The missing product of cracking | GCSE Chemistry: Organic chemistry | 6 marks |
| Showing the products of combustion | GCSE Chemistry: Organic chemistry | 6 marks |
| Which sample is pure: melting points | GCSE Chemistry: Chemical analysis | 2 marks |
| Pure in chemistry and pure on a label | GCSE Chemistry: Chemical analysis | 1 mark |
| What impurities do to melting and boiling points | GCSE Chemistry: Chemical analysis | 1 mark |
| What a formulation is | GCSE Chemistry: Chemical analysis | 1 mark |
| Percentage of a component in a formulation | GCSE Chemistry: Chemical analysis | 2 marks |
| Mass of a component from a percentage | GCSE Chemistry: Chemical analysis | 3 marks |
| Scaling up a formulation | GCSE Chemistry: Chemical analysis | 4 marks |
| Rf value when the start line is not at the edge | GCSE Chemistry: Chemical analysis | 3 marks |
| Distance from an Rf value | GCSE Chemistry: Chemical analysis | 2 marks |
| Mobile and stationary phases | GCSE Chemistry: Chemical analysis | 1 mark |
| Reasons for the steps in chromatography | GCSE Chemistry: Chemical analysis | 1 mark |
Questions are shared by every board that teaches the topic.