S6 Chem (2) - Mixtures

What is the difference between a pure substance and a mixture?

• Pure substances could have parts in different states

• A pure substance has a single type of particle

• Pure substances have non-uniform appearance

• A mixture is made from only one type of particle

Which of the below is an example of a heterogeneous mixture?

• Pizza

• Coffee

• Air

• Steel

If a suspension is left to sit for a long time, what will happen?

• The mixture will become a pure substance

• The particles will remain mixed

• Nothing will happen

• The particles will settle to the bottom

Which of the following is not a colloid?

• Suspension

• Gel

• Foam

• Emulsion

What role does an emulsifier play in a mixture?

• It makes the particles settle out of solution faster

• It prevents particles from separating

• It converts the mixture to a pure substance

• It performs a chemical reaction

Why is light scattered from a suspension?

• Scattering is because of the uniform composition

• The light passes through all parts of the suspension equally

• A suspension is a pure substance so no light can be scattered

• The light rays hit the suspended particles

How could a heterogenous mixture appear homogenous?

• The particles are too small to see

• The particles are moving very quickly

• The particles are very large

• All heterogeneous mixtures appear homogenous at first

The following mixture is:

• Homogeneous

• Heterogeneous

The following is a mixture of:

• Elements

• Compounds

• Elements and compounds

Which of the following is NOT a characteristic of homogeneous mixtures?

• More than one type of particle

• Even mixing throughout

• Only one state

• More than one state