Mixtures & Solutions - Separating Mixtures & Solutions

When would we use a screen to separate a mixture?

• When all I have is a screen

• when we are separating large particles and a liquid

• only when I have rocks

Why can't we use a screen for the water and powder?

• the screen will get dirty

• the screen has holes too big

Why is the filter paper better for this mixture?

• the holes are smaller

• it is white

Why is this special mixture a solution?

• the salt dissolved

• it is clear

What happens when the water evaporates?

• it is all gone

• the salt will be left in the tray

Why can you see the salt crystals in the dish?

• The water has evaporated away, and the salt is left behind.

• The teacher poured salt into the dish.

• The water froze and the salt floated to the top.

If the liquid is just water, what will be left in the evaporation dish after a few days?

• nothing

• salt crystals

• sugar crystals

If you see crystals in the evaporation dish after several days, what should that tell you about the liquid?

• It was just water.

• It was a solution.

How can we test to see if a clear liquid was just water or a solution?

• use a magnet

• use an evaporation dish

• try to see density

Did you watch this video ALL THE WAY to the end?

• yes

• no