Cornell Notes
Topic/Objective: CHAPTER 3 Section 3
Elements, Compounds and Mixtures
Name:
Class/Period:
Date:
Toolbox:
Mixture
Solution
Solute
Solvent
Concentration
Suspension
Colloid
Questions:
Notes:
Why do substances in a mixture keep their identities? Substances in a mixture keep
their identity because no chemical change take place when a mixture is made.
Textbook pg 64
What is an alloy? An alloy is a solid solution of metal or nonmetal dissolved in
another metal
Textbook pg 67
Section Review:
Summary:
1-4 The statements across are false. For each statement, replace the underlined term
to make a true statement.
1) The solvent is the substance that is dissolved. Solute
2) A suspension is composed of substances that are spread evenly among each
other. Solution
3) A measure of the amount of solute dissolved in a solvent is solubility.
Concentration
4) A colloid contains particles that will settle out of the mixture if left sitting.
Suspension
5) A mixture contains substances that are not mixed in a definite ratio.
6) List three ways to dissolve a solid faster. Three ways to dissolve a solid faster
are crushing the solid, stirring the solid and liquid, and heating the solid and
liquid.
7) How do solutions, suspensions and colloids differ? A solution appears to be a
single substance and contain particles evenly distributed among each other.
The particles in a solution are very small and cant be filtered out. A clear
solution will not scatter light. A suspension has larger particles that are
dispersed but will settle out. The particles in a suspension can be filters out
and are large enough to block or scatter light. Particles in a colloid are
smaller then the particles in a suspension but are still large enough to scatter
light.
Questions:
Notes:
8) Suggest a procedure to separate iron filings from sawdust. Explain why this
procedure works. I would use a magnet to separate the iron from the
sawdust. The magnet will attract the iron but will not attract the sawdust.
9) Identify the solute and solvent in a solution made of 15mL of oxygen and 5 mL
of helium. The solute is helium and the solvent is oxygen.
10) At what temperature is 120g of sodium nitrate soluble in 100mL of water?
About 60 degrees Celsius.
11) At 60 degrees Celsius, how much more sodium chlorate than sodium chloride
will dissolve in 100mL of water? About 120g more of sodium chlorate will
dissolve.
Summary: