Year 7 Chemistry Revision

Multiple Choice

Which of the following is NOT a state of matter?

• Solid

• Liquid

• Gas

• Energy

Multiple Select

Which of the following statements correctly describe the properties of a liquid?

• A liquid has a fixed volume.

• Particles in a liquid slide past one another.

• A liquid has a fixed shape.

• Particles in a liquid are tightly packed and do not move past one another.

Multiple Choice

What happens to the particles in a gas?

• They are tightly packed and do not move.

• They slide past one another slowly.

• They move quickly in all directions.

• They are arranged in a fixed pattern.

Match

Match the state of matter to its description

• Solid

• Liquid

• Gas

Fixed volume and shape

Takes shape of bottom of container

Particles spread out in the container

• Fixed volume and shape

• Takes shape of bottom of container

• Particles spread out in the container

Multiple Choice

After a physical change, what happens to the particles of a substance?

• They become different particles.

• They remain the same but move to new positions.

• They disappear.

• They combine to form a new substance.

Multiple Choice

Which of the following is an example of a chemical change?

• Melting ice

• Boiling water

• Burning wood

• Dissolving sugar in water

Multiple Choice

Which of the following is a sign of a chemical change as described in the slides?

• Change in colour

• Melting of ice

• Evaporation of water

• Dissolving sugar in water

Multiple Choice

Which of the following is an element?

• Water (H₂O)

• Oxygen (O₂)

• Salt (NaCl)

• Carbon dioxide (CO₂)

Multiple Choice

Which of these is a compound?

• Hydrogen (H₂)

• Gold (Au)

• Carbon dioxide (CO₂)

• Iron (Fe)

Multiple Choice

Which of the following best describes a mixture?

• A combination of substances that are chemically bonded together

• A combination of two or more substances that can be separated by physical processes

• A single substance made of only one type of particle

• A substance that cannot be separated by any means

Multiple Choice

Which of the following is a pure substance?

• Salt

• Air

• Salad

• Soft drink

Multiple Choice

A glass of salt water is best described as a:

• Pure element

• Pure compound

• Molecule

• Mixture

Multiple Select

Which of the following are characteristics of a heterogeneous mixture?

• Uniform composition

• Evenly distributed components

• Non-uniform composition

• Visible differences

Multiple Choice

Which of the following best describes a homogeneous mixture?

• A mixture where the components are evenly distributed and not easily distinguished.

• A mixture where the components are unevenly distributed and easily distinguished.

• A mixture that contains only one type of particle.

• A mixture that can only be separated by chemical means.

Multiple Choice

Which of these is a homogeneous mixture?

• Oil and water

• Sand and water

• Salt dissolved in water

• Cereal in milk

Multiple Choice

Which of these is a heterogeneous mixture?

• Air

• Lemonade

• Salad

• Vinegar

Multiple Choice

What property allows sieve separation to work effectively?

• Magnetism

• Solubility

• Particle size

• Density

Multiple Choice

Which of these mixtures can be separated by decanting?

• Salt dissolved in water

• Sand mixed with water

• Ink mixed with water

• Sugar dissolved in tea

Multiple Choice

Decanting is useful when the solid in a mixture:

• Dissolves in the liquid

• Is magnetic

• Has settled at the bottom

• Has evaporated

Dropdown

​ Substance remaining in the filter paper​

Select answer

Dropdown

Substance that passes through the filter paper​

Select answer

Video from Google Slides

Match

Match the technique to mixture it is best suited to separate

• Filtration

• Evaporation

• Sieving

• Magnetism

• Chromatography

Sand and salt

Salt water

Gravel and bird seed

Iron filings and saw dust

Coloured ink

• Sand and salt

• Salt water

• Gravel and bird seed

• Iron filings and saw dust

• Coloured ink

Match

Match the technique to mixture it is best suited to separate

• Filtration

• Evaporation

• Sieving

• Magnetism

• Chromatography

Sand and salt

Salt water

Gravel and bird seed

Iron filings and saw dust

Coloured ink

• Sand and salt

• Salt water

• Gravel and bird seed

• Iron filings and saw dust

• Coloured ink