Science Review

A mixture can be created by -

• pouring some water into a glass.
• combining two ore more materials.
• blowing air through a straw.
• melting a solid to form a liquid.

What tool can be used to easily separate a mixture of iron filings and plastic paper clips?

• Beaker
• Strainer
• Balance
• Magnet

All of the following are mixtures EXCEPT- 

• iron filings in sand.
• crushed rock and glass.
• glass marbles in a pile.
• peanuts and raisins together.

How can a student make a sample of sand part of a mixture?

• Place the sample in a closed container and shake it.
• Add gravel to the sand sample and stir them together.
• Pour the sample into a bowl and warm it in sunlight.
• Spread out the sample of sand on a paper towel.

A mixture of sugar and water is different from a mixture of sand and water because when sugar is mixed with water, the sugar-

• floats on top of the water, but the sand sinks.
• can't be removed from water, but sand can.
• dissolves in the water, but the sand does not.
• can be removed with a magnet, but sand cannot.

Which mixture could be separated easily by pouring it through a paper towel?

• Milk and water
• Sand and water
• Salt and water
• Juice and water

Students made two mixtures.  Mixture 1 was made by mixing salt into water.  Mixture 2 was made by mixing iron filings into sand.  Which of the following statements is true for both mixtures? 
Both mixtures can be separated-

• by pouring them through a filter.
• back to their original ingredients.
• using the property of magnetism.
• out into a liquid and a solid.

One group of students mixed salt with warm water.  Another group mixed sugar with warm water.  How are the mixtures the same?
In both mixtures -

• the results change color.
• the water gets cooler.
• the ingredients form layers.
•  a solid dissolves in the water.

Which of the following mixtures could be separated with a magnet?

• Aluminum cans and iron cans
• Plastic cups and paper cups
• Wooden blocks and plastic blocks
• Pencil leads and rubber erasers

How do we know that a salad is a mixture?

• The salad is made up of different types of food.
• Bits of the salad can be picked up with a fork.
• The salad's mass can be measured with a balance.
• The items in the salad are mostly soild.