Assessment item 3
Leanne Voss (Course Coordinator)
Due date:
To be posted by Monday May 14, 2012 (start of week 11)
Weighting:
15%
ASSESSMENT
3
Objectives
This assessment item relates to the course learning outcomes 1 and 4.
Details
These questions are to be completed on the optical mark reader form which will be supplied to
you during the Residential school.
Please ensure that the card is not bent, stapled or torn in any way. It is best to store it in between
two pieces of cardboard. Details on completion of the optical mark reader card can be found at
the end of the course profile and also on the Moodle site.
For each of the following multiple-choice questions, please indicate the one answer that you
consider most correct.
(Total of 30 questions - each question worth 1 mark).
Questions – Module 5 Solutions: Composition and concentration
1. Which one of the following statements is TRUE?
a)
Hydrogen bonding between water molecules lowers the boiling point of a solution.
b)
Hydrogen bonding occurs between hydrogen atoms of different water molecules.
c)
Hydrogen bonding explains why ice floats on water.
d)
Hydrogen bonds are strong covalent bonds.
2. Which one of the following statements is correct?
a)
A polar solute is likely to dissolve in a non-polar solvent.
b)
A nonpolar solute is referred to as being hydrophobic.
c)
A hydrophilic solute will not dissolve in water.
d)
A nonpolar solute will not dissolve in oil.
3. If 0.250 moles of salt (NaCl) is dissolved in 500.0 mL of water, what is the concentration
of NaCl in the solution?
a)
0.125M
b)
0.250M
c)
0.500M
d)
0.750M
4. The concentration term of 5.2 %w/v means
a)
5.2 mole per gram
b)
5.2 gram per mL
c)
5.2 gram per L
d)
5.2 gram per 100 mL
5. A saturated solution is a solution that at a certain temperature
a)
contains the maximum volume of solvent.
b)
contains the maximum amount of dissolved solute.
c)
contains compounds with many bonds.
d)
is very dilute.
6. You have been supplied with a stock solution of herbicide with a concentration of 250 µg
per L. What dilution factor would need to be used if you were to prepare a 50 µg per L
solution of the herbicide?
1
a)
5
b)
1
10
1
c)
1
d)
4
25
Questions – Module 6 Electrolytes, acids bass and buffers
7. Which one of the following statements is not correct?
a)
Cations are ions that carry a positive charge.
b)
Not all electrolytes form ions when they are dissolved in water.
c)
Electrolytes have the ability to conduct an electric current.
d)
A strong electrolyte completely dissociates when dissolved in water.
8. Which one of the following solutions would have the lowest pH?
a) 0.1M HCl
b) 0.01M HCl
c) 0.01M NaOH
d) 0.1M NaOH
9. Which one of the following statements can be used to describe a strong base?
a) A substance that completely dissociates in water to produce hydrogen ions.
b) A substance that partially dissociates in water to produce hydrogen ions.
c) A substance that completely dissociates in water to produce hydroxide ions.
d) A substance that partially dissociates in water to produce hydroxide ions.
10. Which of the following statements regarding acids and bases is not correct?
a)
A base is a chemical substance that produces hydroxide ions.
b)
All concentrated acids completely dissociate in water.
c)
A weak base only partially dissociates in water.
d)
Water partially dissociates into hydrogen and hydroxide ions
11. When an 20.0 mL of a 0.10 M strong acid is reacted with 25.0 mL of a 0.10 M strong base
the resulting solution will be
a)
Acidic
b)
Basic
c)
Neutral
d)
A buffer
12. A buffer solution has a pH of 9.5, and a small amount of strong acid is added to it. Which
of the following is most likely to be the pH of the buffer solution after the acid has been
added?
a)
9.3
b)
7.3
c)
10.3
d)
1.5
Questions – Module 7 Gases and their behaviour
13. Which one of the following is not a unit that is used in the measurement of the pressure of
a gas ?
a)
Pascal (Pa)
b)
Atmospheres (atm)
c)
Torr
d)
Millimetres of Helium (mm He)
14. Which one of the following statements is not correct?
a)
The particles of a gas are always in constant random motion.
b)
The volume of a gas is equal to the volume of the container that the gas is in.
c)
The speed at which gas particles move is always constant.
d)
Gas particles do not attract or repel one another.
15. Consider an amount of gas that is contained in a balloon. If the balloon was cooled, what
change if any would you expect?
a)
The balloon would appear smaller.
b)
The balloon would appear larger.
c)
The size of the balloon would change in an unpredictable manner.
d)
The size of the balloon would not change.
16. A mixture of oxygen and helium is to be prepared for a scuba diva. If the total pressure is
to be 5 atm, and the partial pressure of the helium in the tank is only 1 atm, use Dalton’s
Law of partial pressures to determine the partial pressure of oxygen?
a)
5 atm
b)
4 atm
c)
3 atm
d)
2 atm
17. As a hiker climbs Mount Everest he will experience
a)
Greater atmospheric pressure
b)
Less atmospheric pressure
c)
No change in atmospheric pressure
d)
It is impossible to predict how the atmospheric pressure will vary.
18. Henry’s law states that the amount of gas that dissolves in a liquid depends on the pressure
of the gas above the liquid. Use this law to predict the effect of an increase in temperature
on the oxygen live in a lake.
a)
As the temperature increases, the amount of oxygen in the lake also increases.
b)
As the temperature increases, the amount of oxygen in the lake decreases.
c)
As the temperature increases, there will be no change in the oxygen level in a lake.
d)
As the temperature increases, it is impossible to predict the change in oxygen level.
Questions – Module 8 Climate and weather
19. The major gaseous component in the earth’s atmosphere is
a)
Argon
b)
Hydrogen
c)
Nitrogen
d)
Oxygen
20. Which of the following is not a term used to describe a layer in the atmosphere?
a)
Stratosphere
b)
Troposphere
c)
Magnasphere
d)
Exosphere
21. Uneven heating of the earth’s surface produces
a)
Rain
b)
Clouds
c)
Convection cells
d)
High humidity
22. Which of the following statements is not correct?
a)
There are six Hadley cells around the earth’s surface.
b)
A Hadley cell is in fact a large convection cell.
c)
The number of Hadley cells that form depends on the speed of revolution of the
planet.
d)
Wind in each of the earth’s Hadley cells flows in the same direction.
23. Choose the correct option to complete the following statement. The Coriolis effect causes
a)
wind in the Northern hemisphere to be deflected to the left.
b)
particles in the Southern hemisphere to move in an anticlockwise direction.
c)
wind in the southern hemisphere to turn to the right.
d)
wind in the northern hemisphere to tend to the left.
24. Trade winds play an important role in Australian weather patterns. Which one of the
following statements is not correct?
a)
The impact of the El Nino weather pattern in Australia is one of very low rainfall.
b)
During the La Nina weather pattern, trade winds bring warm water the east toward
Australia.
c)
The El Nino effect is a reversal of the normal trade wind direction.
d)
The La Nina effect typically brings increased rainfall to Australia.
Questions – Module 9 Organic chemistry
25. An organic molecule always contains which one of the following elements?
a)
Carbon
b)
Nitrogen
c)
Hydrogen
d)
Oxygen
26. An alkene can be described by which one of the following?
a)
A compound having acyclic structure
b)
A compound with a carbon-carbon double bond
c)
A saturated hydrocarbon
d)
An aromatic hydrocarbon
27. A hydrocarbon is said to be saturated if
a)
One end of the molecule is hydrophilic while the other end is hydrophobic
b)
It has one or more double bonds between the carbon atoms
c)
Each internal carbon atom is covalently bonded to two hydrogen atoms
d)
It contains more than one functional group
28. The functional group NH2 is a
a) Carboxyl group
b) Amino group
c) Hydroxyl group
d) Amide group
29. Which of the following statements is not correct?
a)
Proteins are made up of many amino acids
b)
Lipids such as cholesterol are water soluble
c)
Enzymes are biological catalysts
d)
Starch is a carbohydrate
30. A protein is formed by the linking of many
a)
glucose units.
b)
DNA molecules.
c)
amino acid molecules.
d)
monosaccharide units.
Assessment criteria
Evidence of the application of the knowledge and conceptual understanding of the scientific
principles of the material studied.