Mixtures and Solutions

1. Which of these BEST describes the change in salt grains as they dissolve in water?

• The grains change their chemicals until they become water.

• The grains get higher in temperature until they melt into a liquid.

• The grains are washed clean until they are perfectly clear.

• The grains break apart until they can no longer be seen.

Tags

NGSS.MS-PS1-2

Amy combined marshmallows, peanuts, raisins, and cereal.

Why would Amy’s snack be considered a mixture?

• She used only nuts and cereal in the snack.

• Each item in the snack kept its physical properties.

• The look of each item changed when combined with the others.

• The taste of each item changed when combined with the others.

Beach sand is made of small, worn rocks and fragments of shells and seaweeds. This means that beach sand is –

• a mixture

• a solution

• a compound

• a liquid

What happens if you stir a small amount of salt and sand until it mixes with water?

• The salt disappears and no longer exists but the sand remains.

• The sand mixes with the salt and you can still see both solids.

• The salt breaks into pieces too small to be seen but the sand does not and can still be seen.

• The salt floats to the top.

Tags

NGSS.MS-PS1-2

Anahita stirred 120 mL of water and 20 mL of salt in a container. The temperature was 22°C. She then adds three ice cubes to the solution and stirs. She observes the Solution for 10 minutes.

Which properties of the solution changed as the ice cubes melted?

• The physical state and the temperature of the solution

• The mass, volume, and temperature of the solution

• The physical state and the color of the solution

• The mass of the salt, the volume, and the temperature of the solution

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Some students were studying different types of mixtures. They stirred together one cup of oil and one cup of water in a large glass beaker. They observed that the water settled to the bottom and the oil floated to the top. Which of the following does this experiment demonstrate?

• The oil maintained its physical properties.

• The oil melts in water.

• The oil is denser than water.

• The oil completely mixed with water.

Tags

NGSS.MS-PS1-2

A student stirred a mixture of sand, iron filings, and water. Which is the best method for separating this mixture?

• Pour the mixture through a funnel and pick out the iron filings with tweezers.

• Pour the mixture into a pot and heat one minute. Then pull the iron out with a magnet.

• Pour the mixture into a filter, leaving the sand and iron in the filter. Then remove the iron with a magnet.

• Use a spoon to scoop out the sand and iron from the water. Use a magnet to remove the iron.

When conducting an experiment mixing sand and water, what safety tool should you use?

• gloves to protect your hands from boiling water

• gloves to protect your hands from sand

• goggles to protect your eyes from boiling water

• goggles to protect your eyes from sand

The table lists the ingredients of five different mixtures.

In which mixtures do all the ingredients maintain their physical state?

• Mixtures 3 and 4 only

• Mixtures 1, 3, and 4

• Mixtures 1, 2, and 5

• Mixtures 2 and 5 only

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Which substances, when mixed together, maintain their original properties?

• gravel, sugar, water

• wood chips, water, sand

• sand, sugar, water

• water, pepper, sugar

Tags

NGSS.MS-PS1-2