Loading please wait

The smart way to improve grades

Comprehensive & curriculum aligned

Try an activity or get started for free

Chromatography

In this worksheet, students will learn about chromatography as a separation technique and its uses in the identification of substances and forensics.

'Chromatography' worksheet

Key stage:  KS 3

Curriculum topic:   Chemistry: Pure and Impure Substances

Curriculum subtopic:   Separating Mixtures

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

Sometimes more than one substance is dissolved in a solution. Chromatography is a technique that is used to separate those substances. For example, if you take a filter paper and put a dot with a marker pen in the centre of it and then add a drop of solvent on the same point as the one you drew the dot on, you will separate the ink into its different colours and the result will look similar to this:

 

Chromatogram

 

Chromatography is used by scientists to analyse samples of water in order to find out how much of certain chemicals are in the water. DNA fingerprinting, which was invented by Professor Sir Alex Jeffreys in 1984 at the University of Leicester, is based on chromatography and is used to identify criminals by their DNA samples. Samples of blood or skin can also be compared by the police using chromatography.

 

Method

 

The sample liquids to be tested are dropped onto special paper. The bottom of the paper is dipped in water or another suitable solvent. The different-sized particles that make up the samples travel through the paper at different speeds, so they separate at different distances. The chromatogram below tested four ink colours in order to separate them into the colours that were mixed to make them up. Study it carefully, because you will be asked questions about it.

 

Chromatogram

---- OR ----

Get started for free so you can track and measure your child's progress on this activity.

What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Get started
laptop

Try an activity or get started for free

  • educational
  • bettfutures
  • cxa
  • pta
  • era2016
  • BDA award
  • Explore LearningTuition Partner
  • tacm