Science 7
Assignment Worksheet
Unit 6
NAME_____________________________________
6.1
a. Pure substances contain only one kind of ______________________________.
b. Every sample of a pure substance has the same __________________ no matter what
its shape or size.
c. A ____________________ contains two or more pure substances.
d. A mixture can be a combination of __________________, __________________,
and _____________________.
e. Different samples of a mixture may have ______________________ properties,
depending on the amount of each pure substance in the sample.
f. Provide 10 examples of each, mixtures and pure substances.
Matter
Mixtures
Pure Substances
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Science 7
Assignment Worksheet
Unit 6
6.2
a. Complete the following chart.
Elements
Compounds
Definition:
Definition:
Sketch and colour a particle of aluminum
(an element)
Sketch and colour the particles that make
up water (a compound)
b. Determine whether or not each pure substance below is an element or a compound and
explain why.
Pure substance
Element or
compound
Clear liquid that can be split
into two gases with different
properties
Yellow solid that always has
the same properties and
cannot be broken down
Colourless gas that burns to
produce carbon dioxide and
water
H
O
H
O
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Reason
Science 7
Assignment Worksheet
Unit 6
c. Provide 10 examples of each, mixtures, elements, and compounds. You may wish to
use examples from the previous section, splitting up the pure substances.
Matter
Mixtures
Pure Substances
Elements
Compounds
6.3
a. There are 3 types of ___________________________________.
b. A(n) _________________________________ is a mixture in which two or more parts
can be seen. Examples are granola and concrete.
c. A(n) _________________________________ is a cloudy mixture with clumps of a
solid or droplets of a liquid scattered throughout a liquid or gas. Examples are muddy
water and farm-fresh milk.
d. A(n) _________________________________ is a mixture of two or more substances
that appears to be made of only one substance. Examples are vinegar and tea.
e. A(n) _________________________________ is a suspension that has been treated to
prevent it from separating.
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Science 7
Assignment Worksheet
Unit 6
f. Provide 5 examples of each, mechanical mixtures, suspensions, solutions, elements,
and compounds. You may wish to use examples from the previous section, splitting up
the mixtures.
Matter
Mixtures
Mechanical
Suspensions
Pure Substances
Solutions
Elements
Compounds
6.4
a.
Method
Description
Picking Apart
Filtering
Using Density
Using
Magnetism
Dissolving
Evaporating
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Example
Science 7
Assignment Worksheet
Unit 6
b. Complete the following table. The first one is done for you.
Mixture
Best Separation Method(s)
Worst Separation Method(s)
marbles and foam balls
Pick apart – they look very different.
Evaporating – neither would evaporate.
Using Density – foam balls would float
while marbles sink.
Using Magnetism – neither is attracted
to a magnet.
oil and water
wood and brick pieces
sand and pebbles
aluminum and iron nails
c. You are given a jar with a mixture of sand, iron filings, sea shells, water and oil.
Describe the techniques you would use to separate the 5 substances. List and describe
each step.
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Science 7
Assignment Worksheet
Unit 6
6.6
a. When a solid dissolves in a liquid, the liquid that does the dissolving is called the
_________________________.
b. When a solid dissolves in a liquid, the solid that dissolves is called the
_________________________.
c. _______________________ is the amount of solute that is dissolved in a given
amount of solvent.
d. When the concentration is low, the solution is ____________________.
e. A substance that dissolves in water is “_______________________ in water.”
f. A solution is saturated when ___________________________________________
__________________________________________________________________.
g. A solution is unsaturated when _________________________________________
__________________________________________________________________.
h. The ability of a substance to dissolve in water is called ______________________.
i. What happens to the solubility of a substance when heat is added?____________
__________________________________________________________________.
6.7
a. Scientists measure acidity on the _______________ scale.
b. This scale of numbers goes from _________ to ___________.
c. The closer the pH value is to zero, the more ______________________the solution.
d. The closer the pH value is to 14, the more ______________________the solution.
e. A solution with a pH of 7 is neither ______________ nor ______________, but is
called __________________.
f. Litmus paper is used to test the ___________________ of a solution.
g. If you put blue litmus paper in an acid it will turn ________________.
h. Red litmus paper will turn blue when it's put in a(n) _______________.
Page 6 of 7
Science 7
Assignment Worksheet
Unit 6
i. Complete the following table.
Acid
Properties
Examples (identify
and give the pH of
5 examples for
each)
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Base