mixtures and solutions - birdvilleschools.net...3 the salad you just made is a good example of a...
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Mixtures and SolutionsTEKS 5.5(C) demonstrate that some mixtures maintain the physical properties of their ingredients such as iron filings and sand
TEKS 5.5(D) identify changes that can occur in the physical properties of the ingredients of solutions such as dissolving salt in water or adding lemon juice to water
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Choose the vegetables to add to your salad.
What if you do not like mushrooms in your salad? How could you take them out?
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The salad you just made is a good example of a mixture. The ingredients maintained their physical properties making it easy to take the salad apart. What physical properties did you use? Tap the boxes below to find out.
mass
volume
density
physical state ~ solid, liquid, or gas
shapesmell
texture
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Physical properties are very useful when separating mixtures. Look in your Science Journal for examples of physical properties we have studied. Write them in the box on the left. Pull the tab when you are finished to check your responses. Did you leave anything out?
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physical state conductors & insulators
mass solubility in water
volume magnetism
density boiling point
freezing point melting point
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mixture two or more types of matter mixed together
all of the parts of a mixture keep their physical properties
ex. trail mix or a salad
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A solution is a special type of mixture where one or more of the ingredients change their physical properties. In a solution something has to dissolve. Click the boxes below to create a solution.
What dissolved into the water and combined to make the lemonade? Why can't we see the sugar cubes or the lemon juice anymore? Are they still there?
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solution a special kind of mixture where something dissolves into something else
a solid can dissolve into a liquid
a gas can dissolve into a liquid
a liquid can dissolve into a liquid
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Lemonade is a good example of a mixture and a solution at the same time. Find the items that dissolve and don't dissolve.
dissolves does not dissolve
sugar
lemon juice
lemon slices
ice cubes
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Just like any other mixture, solutions can also be taken apart. It is just a little trickier. Think back to the list of physical properties we made earlier. Which property of matter would help us to take the dissolved sugar out of the lemonade? Tap on the box below for a hint.
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A sieve or screen would be the best tool to use when separating a mixture of sand and gravel. The sand is small enough to pass through the screen, but the gravel is too large and is left behind.
sand and gravel
How would you separate the mixtures and solutions below?
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A paper filter is the best tool to separate a mixture of water and particulates that do not dissolve and are too small to be separated by a screen.
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A hot plate or Bunsen burner would be the best tool to use when separating a solution of salt and water. Heat energy causes the water to evaporate and the salt is left behind.
salt and water
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A magnet is the best tool to use when a separating a mixture where one of the ingredients is made of metal, specifically, iron and steel. Aluminum, although it is a type of metal, is NOT magnetic.
gravel and paperclips
sand and water
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