Grade 7 Mixtures and
Solutions
Review
Chapter 4
Matter: Anything that has mass and takes
up space
Properties: describe matter
Mixture: a substance made up of two or
more other substances
Heterogenous: a substance that looks like
it is made up of more than one substance
Homogenous: a substance that looks like
it is only made up of one susbtance
Mehanical Mixture: a mixture where all of
the parts that make it up are clearly visible
Pure substance: a substance that is made
up of all of the same particles: not mixed in
any way
Particle Theory of Matter: Describes how
the particles of substances will look and
behave in certain states of matter
Chapter 5
Solute: the substance that is being
dissolved
Solvent: The substance that is doing the
dissolving
Dissolving: the attraction of the particles of
a solvent and a solute
Soluble: can be dissolved
Insoluble: cannot be dissolved
Distillation: a process used to separate the
solute and solvent in a solution
Dilute: increasing the amount of solvent
but the amount of solute stays the same
Concentrated: increasing the amount of
solute, but the amount of solvent stays the
same
Give an example of one solution that you can create at
home. List the solute and the solvent in this solution
At home, I could create a salt water
solution. In this solution, the solute is the
salt (because it is what is being dissolved)
and the solvent is the water (because it is
doing the dissolving)
Why is water considered the “universal” solvent?
Whay environmental implications can arise
because of this?
Water is considered the universal solvent
because it can dissolve many materials.
This can cause environmental problems
because water can dissolve many harmful
materials, due to pollution.
Explain how distillation works using
the particle theory.
Distillation works because different substances
have different boiling points.
The particle theory states that when we heat up
substances their particles move faster
As particles move faster some of them break
free into the air as vapour
If this occurs at different temperatures for
different substances, then we can boil one
substance away and have the other left behind.
This process is called distillation.
Chapter 6
Saturated Solution: a solution that will not
dissolved any more solute
Unsaturated Solution: a solution where
more solute will still dissolve
Solubility: refers to how much solute will
dissolve in a given amount of solvent.
Supersaturated Solution: a solution where
more solute than normally would dissolve
has dissolved. This happens because of
changing things like the temperature of the
solvent.
Rate of dissolving: how long it takes a
solute to dissolve in a solvent
It can be changed!
How could you tell if a solution is
saturated? Supersaturated?
Unsaturated?
Saturated: no more solute will dissolve in
the solvent
Unsaturated: more solute will dissolve in
the solvent
Supersaturated: the temperature had to be
changed in order for more solute to
dissolve than normal.
Draw a diagram to show how a
substance an dissolve in water.
Name 3 ways that we can change the
rate of dissolving. Give an example of
each.
Agitation: stirring the solution
Increase the temperature of the solvent:
boil the solvent before mixing in the solute
Size of solute: Smash the solute into small
pieces or a powder.