CLOZE-ing in on Science!
5.5CD: Mixtures
Matter and Energy
Name: ______________________________ Date:
____________________________
Key Concept 1: Some materials, when mixed together,
maintain their physical properties such as iron filings and
sand.
Passage
When we combine two or more different substances, the result is a
__________________. The ______________, or items we mix
together, often maintain their physical ____________________.
Think about making a salad. We can stir together lettuce, tomatoes,
cucumbers, and onions, but what do they look like before and after
mixing? Their physical properties do not visibly
_________________, or alter, since they look the same before and
after mixing.
Illustration
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© 2011 Rice University – All Rights Reserve
CLOZE-ing in on Science!
5.5CD: Mixtures
Matter and Energy
Key Concept 2: Some materials, when mixed together,
undergo changes in their physical properties such as salt
dissolving in water.
Passage
A solution is a special type of mixture. Solutions are formed when a
substance ______________ into another substance, such as salt into
water. When the solid dissolves, it breaks up into tiny pieces and
spreads ____________ throughout the liquid. Have you ever made iced
tea or grape drink from the powdered mix? When you mix the sugar into
the water, it seems to _____________, but it is still there! It has
dissolved into the water. Not all solids dissolve though – your spoon for
example doesn’t get mixed into the liquid. What else can you think of
that forms a solution when mixed?
Illustration
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© 2011 Rice University – All Rights Reserve
CLOZE-ing in on Science!
5.5CD: Mixtures
Matter and Energy
Key Concept 3: Solutions are mixtures in which the materials have mixed
(but do not combine) at the atomic level and must therefore be separated
using different methods (like evaporation) than other types of mixtures.
Passage
Once we mix a bunch of ingredients together, sometimes we want to
separate them again. Different methods can be used to separate
mixtures and solutions. To determine how to separate a mixture, first
look at the physical ________________ of the ingredients. For example,
if you see metal items such as iron nails in a bucket of sand, you could
use a ____________ to attract and remove the iron nails. If you had a
mixture of sand and gravel, you could separate these items based on
size using a ______________. Think about mixtures you have seen
lately - how else would you separate them?
Illustration
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© 2011 Rice University – All Rights Reserve
CLOZE-ing in on Science!
5.5CD: Mixtures
Matter and Energy
Answer Key
When we combine two or more different substances, the result is a mixture.
The ingredients, or items we mix together, often maintain their physical
properties. Think about making a salad. We can stir together lettuce,
tomatoes, cucumbers, and onions, but what do they look like before and after
mixing? Their physical properties do not visibly change, or alter, since they
look the same before and after mixing.
A solution is a special type of mixture. Solutions are formed when a substance dissolves
into another substance, such as salt into water. When the solid dissolves, it breaks up into
tiny pieces and spreads evenly throughout the liquid. Have you ever made iced tea or
grape drink from the powdered mix? When you mix the sugar into the water, it seems to
disappear, but it is still there! It has dissolved into the water. Not all solids dissolve though
– your spoon for example doesn’t get mixed into the liquid. What else can you think of that
forms a solution when mixed?
Once we mix a bunch of ingredients together, sometimes we want to separate them again.
Different methods can be used to separate mixtures and solutions. To determine how to
separate a mixture, first look at the physical properties/characteristics of the ingredients.
For example, if you see metal items such as iron nails in a bucket of sand, you could use a
magnet to attract and remove the iron nails. If you had a mixture of sand and gravel, you
could separate these items based on size using a sieve/screen. Think about mixtures you
have seen lately - how else would you separate them?
© 2011 Rice University – All Rights Reserve