Science Interim

How can salt be removed or separated from a salt water mixture?

• Use a strainer to separate the two

• boil the mixture, the heat will cause the salt and water to separate

• pour more salt until it absorbs the water

• Freeze the mixture

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Mr. Jones is looking for seashells hidden in the sand on the beach. How could he quickly separate any seashells from the sand?

• He could wait for the Sun to heat the sand.

• He could pour the sand through a sieve (strainer).

• He could use water to absorb the sand.

• He could dissolve the sand in soda.

You put some water in trays in the freezer. Soon you have ice cubes. What happens to the tiny particles of water as the water changes to ice?

• They move in all different directions

• They move slowly

• They move faster

• They move in one direction

Tags

NGSS.MS-PS1-4

A student views two pictures of a lake. The first picture was taken in the summertime. It shows the lake with liquid water. The second picture was taken in the winter. It shows the lake with a frozen layer of solid water on the surface. The student claims the state of the lake is due to the temperature of the water.

• Water becomes a solid when heat is removed, causing the molecules in the water to move more quickly.

• Water becomes a liquid when heat is removed, causing the molecules in the water to move more quickly.

• Water becomes a solid when heat is removed, causing the molecules in the water to move more slowly.

• Water becomes a liquid when heat is removed, causing the molecules in the water to move more slowly.

Tags

NGSS.MS-PS1-4

When heat is used to melt ice what happens to the particles

• they move faster

• they move slowly

• they move all around

• they move in one direction

Tags

NGSS.MS-PS1-4

Your teacher mixes together two clear liquids. Together, the two liquids bubble and turn blue. You just witnessed a

• transfer of energy

• physical reaction

• chemical reaction

• force

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these is an example of a chemical change that occurred? Choose all that apply

• The potassium chlorate changed phase.

• A flame formed inside the test tube.

• A cloud of smoke was produced.

• The resulting solution was black.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5