Separating Mixtures

An impure substance is:

• a mixture.

• a substance consisting of two or more different substances.

• a substance consisting of two or more different types of particles.

• a substance consisting of two or more different types of particles, physically combined.

Which of the following lists contains only mixtures?

• salt water, a cup of tea, sugar

• cordial, air, a cake

• helium, pure water, copper

• toothpaste, concrete, liquid oxygen

Which separation technique is used to separate solutions if both the solute and solvent are required to be kept?

• evaporation

• distillation

• filtration

• chromatography

In a sugar solution:

• sugar is the solute and water is the solvent that dissolves it.

• sugar is the solid and water is the solvent that dissolves it.

• sugar is the solvent and water is the solute that dissolves it.

• sugar is the solute and water is the liquid that dissolves it.

Which of the following is the best example of a suspension?

• A cup of black coffee

• A glass of milk

• Small rocks in the bottom of an aquarium or fish tank

• An oil slick covering the surface of a stream

An unsaturated solution is a solution in which:

• more water can be added to a set amount of solute.

• all of the solute settles to the bottom of the container.

• no more solute will dissolve if it is added to the solvent.

• more solute will dissolve if it is added to the solvent.

Which physical property of the components of a solution allows them to be separated by distillation?

• Solubility in water

• State of matter

• Ability to be heated

• Different boiling points

Which one of the following would you use to separate sand from iron filings?

• a bar magnet
• filter paper
• chromatography paper
• alum

Distillation uses two changes of state. what are they?

• Evaporation and condensation
• Evaporation and freezing
• melting and boiling
• sublimation and condensation

Tags

NGSS.MS-PS1-4

This diagram represents...

• An element

• A molecule

• A compound

• A mixture of elements and compounds

Tags

NGSS.MS-PS1-1