All Mixed Up Investigation

Henry scooped up a bucket of salt water that also had pebbles and sand. Select the answer that shows the tools in the order you would use to separate this mixture.

• evaporation dish, screen, coffee filter

• screen, coffee filter, evaporation dish

• coffee filter, screen, evaporation dish

• magnet, coffee filter, screen

A student mixed 10 g of salt in a container of water. The solution was heated on a hot plate to speed evaporation.

Which statement describes what will be left in the cup after all the water evaporates from the cup?

• 10g of salt

• 100g of salt

• 90g of salt

• 0g of salt

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Knowing the particle size of the materials in a mixture helps you know _____

• how much the mixture will weigh

• what the crystals will look like after evaporation

• whether one of the materials will dissolve

• which tools to use to separate them

What is a mixture?

• two or more materials mixed together

• when you stir boiling water

• when pigs fly

• when one or more materials dissolve into another

Which tool were we able to use to separate the powder during the investigation?

• screen

• filter paper

• magnet

Which observation would provide the evidence that a mixture is a solution?

• The liquid is a cloudy brown color with nothing on the bottom of the glass.

• The liquid is a clear brown color with nothing on the bottom of the glass.

• The liquid remained colorless with brown powder on the bottom of the glass.

• The liquid turned a cloudy brown with some powder on the bottom of the glass.

During our investigation, we separated dry materials like salt, gravel and powder. What tool did we use to separate the largest materials?

• screen

• filter paper

• water

• magnet

Which method would you use to separate a mixture of iron filings and sand?

• A) Use a magnet to attract the iron filings

• B) Add water to dissolve the sand

• C) Use a filter paper to separate the sand

• D) Heat the mixture to melt the iron filings

What happens to the mass of a mixture when it is separated into its components?

• A) The mass increases

• B) The mass decreases

• C) The mass remains the same

• D) The mass becomes zero

Tags

NGSS.MS-PS1-5

Which of the following is an example of a homogeneous mixture?

• A) Sand and water

• B) Oil and water

• C) Salt dissolved in water

• D) Gravel and sand