Vocabulary Week of Jan 10, 2016 Week 1 – Quiz: Jan 18, 2016
1. Homogenous Mixture: Mixture that has the same properties throughout
the mixture. For example: salt and water.
2. Heterogeneous Mixture: mixtures which have different properties
throughout the mixture. For example: sand and water.
3. Solvent: The liquid in which a solute dissolves. For example: water in the
sea
4. Solute: The substance that dissolves in a liquid to form a solution. For
example: the salt in sea water.
5. Solution: The mixture formed when a solute is dissolved in a solvent. For
example: sea water.
6. Insoluble: describes a substance that will not dissolve. For example: sand
in sea water
7. Separation by chemical reaction: When chemical forces are used or when
molecular bonds are manipulated to separate components of a
compound. For Example: Electrolysis or Chemical reactions
(chemolysis).
8. Filtration: Separates a liquid from an insoluble solid. Can also be used to
separate any un-dissolved solute.
9. Evaporation: Applying heat energy to liquid to separate it from less
reactive material by turning them to vapor before the other substance.
10. Chromatography: Water tension carries molecules against gravity and
lighter substances move faster.
F/H
F/H
11. You have been tasked with separating a mixture of iron filings and flour.
Your mixture is given to you in a glass petri dish. The petri dish weights
72 grams. When you weigh your sample in the petri dish the total weight
is 113 grams. Your teacher gives you the following tools and asks you to
remove the iron filings. Explain how you would go about doing that.
Plastic wrap
Magnet wand
Spirit burner
and beaker
Sieve
Funnel with
filter cloth
Chromatography
paper
I will choose the magnetic wand and the plastic wrap. Wrap the plastic wrap
around the wand magnet and place it in the mixture, the iron filings will be
attracted to the magnetic wand leaving the flour behind. Removing the plastic
wrap will remove the iron filings from the magnet (2 marks).
12. You weigh or iron filings and find the weight to be 30 grams. Calculate
your yield (show your work).
Yield: _________30/40 = 75%___________(3 Marks)
B
13. What type of mixture is iron filings and flour?
a. Homogeneous mixture
b. Heterogeneous mixture
14. You are tasked with separating sugar from a mixture of sugar and water.
Given the same choice of tools as in question 11, explain how you would
do this separation?
I will choose a spirit burner and beaker. I will evaporate the water from the
sugar-water solution (2 marks)
15. You weigh the sugar water mixture to be 150 grams. After removing the
sugar, you find there is 15 grams of sugar. Using the equation for
calculating the percent concentration of a solution (below). What was the
percent concentration of sugar in the original solution?
_______15/150 x 100 = 10______% sugar solution (2 marks)
A
16. What type of mixture is sugar and water?
a. Homogeneous mixture
b. Heterogeneous mixture
B
17. What type of mixture is sand mixed with water?
a. Homogeneous mixture
b. Heterogeneous mixture
18. How would you separate a sand and water mixture?
I would use a filter and filter out the water (2 marks).
A
19. Which is the best way to separate salt from salty water?
a. Evaporation
b. Filtration
c. Distillation
B (A) 20. Pure water can be separated from inky water by simple distillation
because
a. water and ink have different boiling points
b. water evaporates leaving ink particles behind
A
c. ink evaporates leaving water behind
21. What is the correct order for obtaining salt from a mixture of sand and
salt?
a. Dissolving in water – filtration – evaporation.
b. Evaporation – filtration – dissolving in water.
C
c. Filtration – dissolving in water – evaporation.
22. What method is usually used to separate colored substances from each
other? (Hint to the right)
a. Simple distillation
b. Evaporation
c. Chromatography
A
23. How do you separate iron filings from a mixture of iron and sulfur?
(Hint: sulfur is a non-metal)
a. Using a magnet
b. By adding water and filtering
c. By distillation
B
24. In filtration, what name is used to describe the solid left in the filter
paper?
a. Filtrate
b. Residue
c. Distillate
B
25. If you want to make pure drinking water from sea water, what process
would you use?
a. Filtration
b. Distillation
c. Evaporation
Chapter Summary Questions:
C
26. Which of the following sentences is correct?
a. A mixture is made up of different substances that are chemically
joined together
b. You cannot change the amounts of substances in a mixture.
c. A pure substance has no other substances mixed with it.
27. For question 26, write the correct versions of the incorrect sentences.
A mixture is made up of different substances that are not chemically joined
together.
You can change the amount of substances in a mixture.
(2 Marks)
28. Tim heats a sample. He plots the temperature every minute. Use the
graph to decide whether the sample is a pure substance or a mixture of
substances. Explain your decision.
Substance is pure because the phase change (melting or boiling) takes place at a
clearly-defined temperature (2 marks).
A
29. If between A and B is a solid and between C and D is a liquid, what is
happening moving from B to C above?
a. Melting
b. Vaporization
c. Freezing
d. Condensing
A/B
30. If between C and D is a liquid and between E and F is a gas, what is
happening moving from B to C above?
a. Melting
b. Vaporization
c. Freezing
C
d. Condensing
31. If we are measuring a temperature at F and begin to constantly remove
energy. Which is the correct order of phase changes we will observe?
a. Vaporization, Melting
b. Condensation, Melting
c. Condensation, Freezing
d. Vaporization, Freezing
32. Compare mixtures and compounds in a few sentences.
In a mixture, substances are not joined together. In a compound the atoms of the
substances are strongly joined together. Substances in mixtures keep their
properties, whereas compounds have different properties to the elements
they’re made of. Substances in mixtures can be easily separated. Substances in
compounds have to be separated by chemical reactions. The amount of each
substance in a mixture can change, but in a compound the relative amount
cannot change (6 marks).
33. Match the correct letter of the word that fits the numbered space in the
sentence.
A: Solvent B: Solute C: Solution D: Water E: Salt
“When a salt dissolves in water a 1 forms. Salt is a 2 and water is the 3 . In
the solution 4 particles surround the 5 particles.”
1: C
2: B
3: A
4: D
5: E
34. Laura has three beakers. Each contains 200 cm3 of colourless liquid.
Describe how Laura could find out which beakers contain pure water, and
which contain solutions. Explain your answer.
Since pure water has a density of 1 g/cm3, Laura should find the masses of each
liquid on a mass balance. The liquid, with a mass of 200 g, will be pure water and
the other two liquids will be solutions (3 marks).