Year 7 Science: Mixing and Separating Revision

What is a mixture?

• A screen or membrane used in filtration

• A substance made from two or more pure substances that have been stirred together and that can be separated to recover the original chemicals

• A substance that dissolves to make a solution when mixed into a solvent

• A substance that does not dissolve in a particular solvent

What is a pure substance?

• A process that uses heat to make a liquid solvent change state to a gas, and leave behind the solute it had dissolved

• A device that spins very fast to separate solids from liquids, or liquids from solids

• The separation of solids or liquids from a liquid or gas by using a barrier with holes smaller than particles being separated

• Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure.

From the options below, select all the boxes that are mixtures.

• Mud

• Cement

• Oxygen

• Sea water

• Carbon

From the options below, select all the boxes that are pure substances.

• Hydrogen

• The air we breathe

• Plastic

• Gold

• Copper

A solvent is defined as __________________

A solute is defined as ____________________

A solution is defined as _________________

A suspension is defined as ______________

• A mixture in which a substance will not dissolve in another and quickly separates out if left to stand

• A mixture in which a substance will dissolve in another and quickly separates out if left to stand

• A solution in which a substance will not dissolve in another and quickly separates out if left to stand

• A mixture in which a substance will not dissolve in another and quickly separates out to form a solution

Sediment in defined as __________________

• Soluble substances that settle on the bottom of the liquid

• A property that describes how much matter (mass) is packed into a set volume

• Insoluble substances that settle on the bottom of the liquid

• A method of separating a mixture by making it move over or through another substance that stays still

A substance that dissolves is said to be

• Soluble

• Insoluble