Solutions and Mixtures

What is a mixture?

• A combination of substances that change their properties.

• A combination of substances where all substances keep their original properties.

• A single substance that cannot be broken down.

• A liquid that has something dissolved in it.

Which of these is an example of a mixture?

• Salt dissolved in water.

• Hot cocoa.

• Clothes in a dresser drawer.

• Sugar dissolved in water.

What is true about most mixtures?

• They cannot be separated.

• They can easily be separated.

• They always dissolve completely.

• They change their original properties.

How can you separate iron filings from sand?

• Use a strainer.

• Use a magnet.

• Boil the mixture.

• Use tweezers.

What tool can you use to separate sand from gravel?

• A magnet.

• A water filter.

• A strainer.

• Tweezers.

What is a solution?

• A combination of substances that stay separate.

• A mixture where one substance dissolves into another substance.

• A substance that cannot be seen.

• A solid that floats on water.

Which of these is an example of a solution?

• Sand and gravel mixed together.

• Iron filings and sand mixed together.

• Salt dissolved in water.

• Clothes in a drawer.

What is the easiest way to separate a solution like salt water?

• Use a magnet.

• Use a strainer.

• Heat it up to evaporate the water.

• Pick out the salt with tweezers.

If you have sand, sugar, and gravel mixed in water, what is the first step to separate them?

• Boil the water to get the sugar.

• Filter the sand and gravel out of the water.

• Use a magnet to remove the sand.

• Stir the mixture faster.

Which of these can make a substance dissolve faster?

• Making the substance into bigger pieces.

• Cooling the liquid down.

• Stirring the mixture.

• Letting it sit without touching it.