T2.1 Mixtures

What is a mixture?

• A substance made of two or more elements that are chemically combined.

• A substance made of two or more substances that are together but their atoms are not chemically combined.

• A single element in its pure form.

• A compound that cannot be separated into simpler substances.

Which of the following is true about the atoms in a mixture?

• They are chemically combined.

• They are not chemically combined.

• They form a new substance.

• They cannot be separated.

What is a characteristic of a heterogeneous mixture?

• Components are spread out evenly throughout the mixture.

• Components are not spread out evenly throughout the mixture.

• Components are chemically bonded.

• Components are in a single phase.

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

• Saltwater

• Air

• Sand

• Vinegar

What is a characteristic of a homogeneous mixture?

• It looks different throughout the mixture.

• It looks the same throughout the entire mixture.

• It has visible different parts.

• It cannot be separated into its components.

Which of the following is an example of a homogeneous mixture?

• Salad

• Sand and water

• Sea water

• Oil and water

Which of the following methods can be used to separate mixtures using heat (or letting dry over time)?

• By magnets

• By filters

• By dissolving

• By evaporation

Which of the following methods can be used to separate mixtures of an insoluble solid and a liquid?

• By heat

• By magnets

• By filters

• By dissolving

What is a colloid?

• A homogeneous mixture with dissolved particles

• A heterogeneous mixture with large, undissolved particles

• A homogeneous mixture with small, undissolved particles

• A heterogeneous mixture with small, undissolved particles

Which of the following is an example of a colloid?

• Saltwater

• Paint

• Sugar solution

• Vinegar