4.5B Mixtures / Solutions Pretest

A student stirred 10 grams of salt into 50 mL of water and 10 grams of sand into 50 mL of water and let both mixtures sit for ten minutes.

• The salt, sand, and water do not mix together

• Salt dissolves in the water but sand does not

• Mixture 2 can be separated, but Mixture 1 cannot.

• Mixture 1 is a solid and a liquid, but Mixture 2 is not.

A magnet would be most useful in separating which of the following mixtures?

• Salt and water

• Rocks and soil

• Sugar and iced tea

• Iron filings and sand

A student investigated what happens when different substances are added to water. The table shows his results. In which mixture does one substance dissolve in another?

• Pepper and water

• Sand and water

• Sugar and water

• Flour and water

The table shows different sizes of particles found in a sample of sand. Students have a strainer with holes that are 500 micrometers wide. The strainer could be used to separate which of the following mixtures?

• Very fine sand and fine sand

• Fine sand and medium sand

• Medium sand and coarse sand

• the final appearance is the same

What does a mixture of rocks and water have in common with a mixture of salt and water? In both mixtures -

• two substances are combined

• a solid dissolves in a liquid

• the same substances are used

• the final appearance is the same