a process that separates insoluble substances from a liquid using a filter

placed inside the filter funnel to separate the insoluble solid from the liquid in the mixture

is cone-shaped with a tube, and is placed in  the top of the conical flask when filtering.

the insoluble solid collected in the filter paper

the liquid separated from the insoluble solid

Separating an insoluble solid from a liquid

Science

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.

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.

Content guidance

Risk assessment required - equipment

Adult supervision required

This lesson will be removed by end of Summer Term 2025.

Separating an insoluble solid from a liquid

Lesson outcome

Content guidance

This lesson will be removed by end of Summer Term 2025.