Unit 2 Science Review

A container with ice in it is left in a warm room. After three hours, what has most likely happened to the ice? The ice has–

• Increased in size

• Turned to a gas

• Melted into liquid

• Gotten colder

A student heats chocolate chips. What properties would you expect to see change?

• Shape and taste

• Taste and state of matter

• State of matter and shape

• Size and mass

On what kind of day will ice most likely melt quickly?

• A hot, sunny day

• A cold, snowy day

• A warm, rainy day

• A cool, clear day

When water is frozen, its state of matter changes from a -

• solid to a liquid

• liquid to a solid

• gas to a liquid

• liquid to a gas

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 the 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 solid

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

A magnet would be most useful in separating which of the following mixtures?

• Salt and water

• Rocks and soil

• Sugar and iced tea

• Iron filings and sand

11. What does a mixture of rocks and water have in common with a mixture of salt and water?

• two substances are combined

• a solid dissolves in a liquid

• the same substances are used

• the final appearance is the same