Mixtures and Solutions Mixtures and Solutions ReviewReview

MixturesMixtures

A mixture combines two or more materials A mixture combines two or more materials without changing their properties.without changing their properties.

Because a mixture is the result of a Because a mixture is the result of a physical change, it can be reversed.physical change, it can be reversed.

Many mixtures will keep some properties Many mixtures will keep some properties of the materials that go into them like of the materials that go into them like the raisins mixed into your cereal the raisins mixed into your cereal flakes.flakes.

SolutionsSolutions

Solutions are formed when one or more substances Solutions are formed when one or more substances dissolve in another.dissolve in another.

A solution is a mixture combined at the very smallest A solution is a mixture combined at the very smallest level, down to the particles that make up all matter.level, down to the particles that make up all matter.

For example, when you add sugar to your cereal, the For example, when you add sugar to your cereal, the sugar dissolves in the milk to form a solution.sugar dissolves in the milk to form a solution.

Sugar (solid) and milk (liquid) combine to make a Sugar (solid) and milk (liquid) combine to make a solution because the sugar completely dissolves in solution because the sugar completely dissolves in the milk.the milk.

To separate a liquid-solid solution, you must evaporate To separate a liquid-solid solution, you must evaporate away the liquid. This will leave the solid behind.away the liquid. This will leave the solid behind.

How Do You Separate How Do You Separate Mixtures?Mixtures?

There are different ways to separate a mixture.There are different ways to separate a mixture.As already mentioned, you can “evaporate” the liquid out As already mentioned, you can “evaporate” the liquid out

of some solutions to leave a solid behind.of some solutions to leave a solid behind.The fastest way to do this is by The fastest way to do this is by boiling the liquidboiling the liquid..Another way to separate a mixture is by using a filter.Another way to separate a mixture is by using a filter.Pour the entire mixture over a coffee filter inside a funnel.Pour the entire mixture over a coffee filter inside a funnel.The liquid will flow through the filter and leave behind the The liquid will flow through the filter and leave behind the

solid particles on top of the filter.solid particles on top of the filter.Another property to keep in mind when separating Another property to keep in mind when separating

mixtures is “magnetism”. mixtures is “magnetism”. If, for example, you have iron filings mixed with sand, you If, for example, you have iron filings mixed with sand, you

can use a magnet to pull the iron filings out of the sand.can use a magnet to pull the iron filings out of the sand.

Lets Review….Lets Review….

Sugar and water are poured into a container Sugar and water are poured into a container and mixed together. Which method and mixed together. Which method would be the would be the fastest wayfastest way to separate the to separate the sugar from the water-sugar solution?sugar from the water-sugar solution?

a.a. Use a magnetUse a magnetb.b. Pour the solution through a filterPour the solution through a filterc.c. Boil the solution Boil the solution d.d. Sit the container in a window and wait for Sit the container in a window and wait for

it to evaporateit to evaporate

Sugar and water are poured into a Sugar and water are poured into a container and mixed together. container and mixed together. Which method would be the Which method would be the fastest fastest wayway to separate the sugar from the to separate the sugar from the water-sugar solution?water-sugar solution?

Correct answer:Correct answer:

Boil the solution Boil the solution

When iron filings are mixed with sand, When iron filings are mixed with sand, they create a mixture. What would they create a mixture. What would be the best way to separate the be the best way to separate the ingredients in the mixture?ingredients in the mixture?

a.a. Put the mixture in water and stir itPut the mixture in water and stir it

b.b. Use a magnet to separate the iron Use a magnet to separate the iron filingsfilings

c.c. Pour the mixture through a filterPour the mixture through a filter

When iron filings are mixed with sand, When iron filings are mixed with sand, they create a mixture. What would they create a mixture. What would be the best way to separate the be the best way to separate the ingredients in the mixture?ingredients in the mixture?

The correct answer is:The correct answer is:

Use a magnet to separate the iron Use a magnet to separate the iron filings.filings.

Sally made four cups of water. She Sally made four cups of water. She added different material in each cup added different material in each cup and stirred it. Which of the following and stirred it. Which of the following will form a solution with the water?will form a solution with the water?

a.a. SugarSugar

b.b. SandSand

c.c. Salad oilSalad oil

Sally made four cups of water. She Sally made four cups of water. She added different material in each added different material in each cup and stirred it. Which of the cup and stirred it. Which of the following will form a solution with following will form a solution with the water?the water?

The correct answer is:The correct answer is:

SugarSugar

The Magic School Bus: Gets The Magic School Bus: Gets Ready, Set, DoughReady, Set, Dough

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