Week 1 Term 2 Level L 2021
Part 1 Chapter 6
The Condensed Phases of Matter
1. Define solution.
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A solution is a homogeneous mixture that contains
more than one substance.
2. At the same temperature which molecules are on the
average likely to have the highest kinetic energy?
a) Gaseous molecules.
b) Solid molecules.
c) Liquid molecules.
d) Heaviest molecules.
e) Molecules of all states and types will have the same
average KE.
(since they are at the same T)
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2. At the same temperature which molecules are on the average
likely to have the highest kinetic energy?
a) Gaseous molecules.
b) Solid molecules.
c) Liquid molecules.
d) Heaviest molecules.
e) Molecules of all states and types will have the same average KE.
(since they are at the same T)
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14. a)
What does the term 'the molar concentration of a solution' refers to?
Molar concentration
of a solution indicates the number of moles of a solute per dm3 of
solution. It is the ratio of moles of solute to dm3 of solution.
b) Is this
the same thing as molarity?
Yes.
c) What
does it mean to say that the molar concentration of a sugar solution is 0.25 M?
It means the solution contains 0.25 mole
of the solute per dm3 of solution.
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15.
Explain how you would prepare a 2.00 M NaCl, 1.00 L solution.
a) Calculations:
Find the number of moles needed: n = CV = 2.00 × 1.00 = 2.00 mole Find mass
needed: m = nM = 2.00 × 58.5 = 117g
b) Laboratory
procedure:
1) 117g of NaCl is
weighed
2) Add solid to 1.00
dm3 volumetric flask and add some distilled water to dissolve the
solid. The mixture is swirled until the salt dissolves completely. 3) Add
enough water till the etched mark.
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16. Two
liters of 1.0 M NaCl solution is prepared in a flask. 500 ml of solution is
poured out of the flask into a beaker. What is the concentration of the salt
solution in the beaker?
1.0M Nothing has
been added to the solution Þ its
concentration remains the same.
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17. 0.15
dm3 of 2.0 M NaOH solution is to be prepared in a flask. How many
moles of NaOH are required?
n = CV = 2.0 × 0.15 = 0.30 mole
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18. What is meant by the term
“solubility”?
Solubility is the concentration of a
saturated solution at a certain temperature. It is the concentration of the
solution where the maximum of solute is dissolved.
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19. What is meant by a
“saturated solution”?
A
saturated solution is one in which no more solute can dissolve
20. a) What are aqueous
solutions?
Aqueous solutions are solutions in which the
solvent is water.
b) Can you have aqueous
solutions where the solute is a solid, a liquid or a gas?
Yes
Give an example of each case.
1) Salt and water. (a solution of solid
in water)
2) Alcohol and water. (a solution of liquid in water)
3) Carbon dioxide and water. (a solution
of gas in water)
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