revision Yr 7 Scienc 16 Sept 2024

A tablet is dissolved in a glass of water. Identify the solute:

• The water

• The tablet

• The glass

• The tablet and water combined

Name the physical property that allows mixtures to be separated by decanting or sedimentation:

• Boiling point

• Magnetism

• Density

• Compressibility

Identify the separation technique that can be used to separate materials with different solubilities:

• Evaporation

• Distillation

• Magnetic separation

• Chromatography

Muddy water looks murky because:

• Mud particles are soluble

• Mud is dirty

• Mud particles are spread out and suspended in the water

• Mud particles have been pulled apart and spread through the water

The correct sequence of steps to separate a mixture of salt, sand, and iron filings is:

• Add water → evaporation → filtration → magnetic separation

• Add water → filtration → evaporation → magnetic separation

• Add water → magnetic separation → filtration → evaporation

• Magnetic separation → add water → filtration → evaporation

Which property is used to separate aluminum from steel and tin at a materials recovery facility?

• Density

• Magnetism

• Solubility

• Conductivity

A mixture is best defined as:

• A substance made up of three different substances

• A pure substance

• A material made up of two or more different chemical substances which cannot be separated by physical methods

• A combination of two or more substances that mix together without any chemical reaction taking place

Centrifugation separates mixtures based on:

• Mass

• Solubility

• Boiling point

• Magnetism

An 18-carat gold ring is made of 75% solid gold with 25% other solid metals. The ring is:

• A mixture

• An element

• Contaminated

• A pure substance

Can petrol be separated from water by decanting?

• Yes

• No

• Depends on the type of petrol

• Depends on the type of water