The process of separating an insoluble substance from a liquid using a filter.

Paper with tiny holes, placed inside the filter funnel to separate an insoluble solid from a liquid.

A cone-shaped tool with a tube, placed in the top of a conical flask during filtration.

The insoluble solid that remains in the filter paper.

The liquid that passes through the filter paper, separating from the insoluble solid.

Separating an insoluble solid from a liquid

Science

Separating a soluble solid from a liquid

Separating pure salt from dirty rock salt

Separating liquids

Simple distillation

Distillation: practical

Chromatography

In the Understanding Chemical Reactions unit, pupils will build on their understanding of physical changes to learn how atoms rearrange to form new substances during chemical reactions (chemical changes).

In the key stage 2 Properties, changes and separating materials unit, pupils learnt about mixtures, including solutions, and separation techniques including filtering and evaporation.

This unit covers techniques for separating mixtures, including filtration, evaporation, distillation, and chromatography, as well as identifying pure substances. Conduct experiments safely, record observations, evaluate methods, and suggest improvements.

Separation techniques

Physical activity and equipment requiring safe use

Some insoluble solids are more {{}} than a liquid and this property causes them to sink.

What is the name of the two separation techniques that involve mixtures being poured?

The insoluble solid collected in the filter paper.  

The liquid separated from the insoluble solid.

To physically divide different parts of a mixture.

place a conical flask with a flat bottom and narrow neck on the table

place a filter funnel in the neck of the flask

fold the round filter paper into quarters

open one quarter of the filter paper to form a pocket

place the filter paper pocket into the filter funnel

add a drop of water to keep the filter paper in place

Order the followings steps to show how to set up the equipment to perform the filtration of an insoluble solid in a liquid.

Filtration is used when making a cup of tea from a teabag. Match up the scientific word to the part involved in making the cup of tea.

all filtrate particles pass through the filter paper pores

the mixture is rapidly poured through the filter paper

the residue particles are blocked by the filter paper pores

a beaker is used rather than a conical flask

Look at the image of filtering equipment. Choose the problems that could occur when filtering.

Which substances are insoluble (do not dissolve) in water?

A {{}} is a material that contains two or more different substances, which can be physically separated.

What mixture is formed when a substance dissolves in a liquid?

A substance which can dissolve in a liquid.

To divide something into its different parts.

A substance which cannot dissolve in a liquid.

Match the following words to their meaning.

Iron is a {{}} material as it is attracted to magnets.

Separating an insoluble solid from a liquid

Lesson outcome

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