Mixture Ck-12

Which property is NOT used to separate a mixture?

• boiling point

• ability to dissolve

• particle size

• ability to undergo a chemical change.

Soil is a heterogeneous mixture. Which of the following statements best explains why?

• It is unevenly mixed, so it does not have the exact same composition throughout the mixture.

• It is uniformly mixed, so it has an even composition throughout.

• The particles are large enough to see, so it looks the same throughout.

• The components are chemically bound together in a disordered shape, so it does not have the same composition throughout the mixture.

Which of the following statements about mixtures us FALSE?

• the components keep their physical properties

• mixtures can be separated using physical properties

• substances must combine in specific proportions

• they are all mixed uniformly and have an even composition throughout

Which of the following are mixtures?

• copper

• sand

• oxygen

• water

• air

Pick the word that best completes the following sentence. A ____________ mixture is a mixture in which the composition is uniform throughout the mixture.

• homogeneous

• heterogeneous

• compound

Lemonade is a murky yellow color. If you leave it sitting for a few minutes, you might need to stir it again before you drink it. What type of mixture is lemonade?

• compound

• colloid

• solution

• suspension

Salt water is a homogeneous mixture. Which of the following statements best explains why?

• It is unevenly mixed, so it does not have the exact same composition throughout the mixture.

• It is uniformly mixed, so it has an even composition throughout.

• The particles are large enough to see, so it looks the same throughout.

• The components are chemically bound together, so it looks the same throughout.

Butter is a mixture of proteins and fats that does not separate out when left alone. What type of mixture is butter?

• compound

• colloid

• solution

• suspension

In carbonated water, when carbon dioxide bubbles are thoroughly mixed into the water, they become invisible. What type of mixture is butter?

• compound

• colloid

• solution

• suspension

Mixtures can only be separated out by a chemical change.

• true

• false