Y8 Separation Techniques Revision

  Steven adds salt to water, a little at a time. He stops adding salt when no more will dissolve. What are two things Steven could do to make the experiment fair?

• Use the same amount of water

• Use the same volume of water

• Use the same mass of salt

• Keep the temperature the same

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

9. Kieran adds 100 grams of sodium bromide to 100 grams of water but only 91 grams of the mixture dissolves. Calculate the mass of sodium bromide left undissolved.

• No change in mass

• 8g of sodium bromide left undissolved

• 100 g of sodium bromide left undissolved

• 9 grams of sodium bromide left undissolved.

If you add sugar to water, it ______. Sugar is the ______ and water is the ______. A mixture of sugar and water, in which you cannot see the separate substances, is a ______.

Tags

CCSS.RI.7.3

CCSS.RI.7.5

CCSS.RI.8.3

CCSS.RI.8.5

CCSS.RI.9-10.5

During a filtration experiment, Ben collects the filtrate in a beaker. Describe what the filtrate and the residue are, and what their differences are.

Answer explanation

The filtrate is the clear liquid that passes through the filter paper and collects in the beaker. The residue is the solid material that remains on the filter paper. The main difference is that the filtrate is the component that has passed through the filter, while the residue is the component that is left behind.

Tags

CCSS.RI.7.3

CCSS.RI.7.5

CCSS.RI.8.3

CCSS.RI.8.5

CCSS.RI.9-10.3

What is the purpose of a filter paper in a filtration experiment?

• a) To evaporate liquids

• b) To dissolve solids

• c) To separate solids from liquids

• d) To measure weight

Which method is best for separating a mixture of sand and salt?

• a) Filtration followed by evaporation

• b) Chromatography

• c) Distillation

• d) Using a magnet

What change of state happens in the condenser during distillation?

• a) Liquid to gas

• b) Solid to liquid

• c) Gas to liquid

• d) Liquid to solid

Tags

NGSS.MS-PS1-4

Explain how filtration separates sand and water (hint: talk about particles)

Answer explanation

Water particles are small enough to fit through the tiny holes in the filter paper. Sand particles are too big to fit through.

Tags

NGSS.MS-PS1-2

Which other mixture contains X?

• A

• B

• C

• D

Which diagram shows how the apparatus is set up?

• A

• B

• C

• D