Page 1 of 8 SNC 2D1 FINAL EXAM – JUNE 2001 Please check (X ...

SNC 2D1 FINAL EXAM – JUNE 2001
Please check (X) the name of your teacher
® Miss. E. Brown Time 1.5 h
® Mr. R. Fowler Date
® Mr. J. Roberts
® Mr. D. Sutherland
NAME:_________________________________________________________
PERIOD: ______
NOTES and INSTRUCTIONS
1. Answer Part A – Multiple Choice using the answer grid provided as the last page of this examination
booklet. It may be detached from the booklet for ease of use.
2. Answer Part B - Written questions on separate pages.
3. Calculators may be used but may not be shared.
4. The mark distribution and suggested time allocation is shown below.
MARKS
TIME
Part A: Multiple Choice 32 30 minutes
Part B: Written 55 60 minutes
________
_________
87 90 minutes
5. Ensure that you name is on each page of your exam with your answer grid stapled to the top of this
exam booklet.
PART A - MULTIPLE CHOICE QUESTIONS
(Allow 30 minutes)
(32 marks)
Please indicate your answer by marking an “X” through the letter of your choice on
the Part A - Answer sheet provided as the last page of this booklet.
1. From this list of organisms choose the producers: oak tree, slugs, squirrels, bacteria, wheat, insects
(a) oak tree, slugs
(b) oak tree, wheat
(c) bacteria, oak tree, wheat (d) oak tree, squirrels, insects
2. What types of outside disturbances can start secondary succession?
(a) fire (b) floods (c) hurricanes (d) all of the above are correct
3. Which of the following is NOT a selection pressure?
(a) the ability to find a mate (b) food availability (c) suitable habitat (d) personal income
4. Which gas is a major cause of global warming?
(a) Nitrogen (b) Hydrogen (c) Oxygen (d) Carbon dioxide
5. Which is NOT an essential condition in a self-sustaining ecosystem?
(a) equal numbers of plants and animals
(b) a constant source of energy
(c) the presence of autotrophic organisms
(d) the cycling of materials between organisms and their environment
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6. A homeowner left the grass clippings on the lawn when it was mowed. She discovered that the lawn
needed less fertilizer than it did when she collected the clippings. This is because
(a) energy flow is one way
(b) energy must enter the lawn ecosystem from the sun
(c) the clippings help retain water
(d) nutrients are recycled
7. Organisms that convert complex compounds into simpler compounds that are than returned to the
environment for use by other organisms are best classified as
(a) consumers (b) producers (c) decomposers (d) autotrophs
8. The element that is the basis of life on this planet, and is recycled by the processes of
photosynthesis and respiration is
(a) silicon (b) sulfur (c) nitrogen (d) carbon
9. What abiotic factor might be an important part of a grassy field environment?
(a) daily and seasonal temperature changes
(b) the microorganism population
(c) species competition
(d) the number of food chains
10. Which process removes nitrogen from the air?
(a) Nitrogen fixation (b) Denitrification (c) Photosynthesis (d) Eutrophication
11. In which atmospheric layer does most weather occur?
(a) stratosphere (b) mesosphere (c) troposphere (d) thermosphere (e) magnetosphere
12. Between 60 o latitude and the poles, surface winds tend to flow:
(a) north to south (b) east to west (c) south to north (d) west to east
13. In Canada, jet streams are high-speed winds in the upper troposphere that move:
(a) north to south (b) east to west (c) south to north (d) west to east
14. During El Niño:
(a) the trade winds travel eastward, and rainfall increases along the coast of Peru.
(b) the trade winds travel westward, and rainfall increases along the coast of Peru.
(c) the surface temperatures of the Pacific Ocean decreases, eases along the coast of Peru.
(d) the trade winds travel eastward, and rainfall decreases along the coast of Peru.
15. Ocean currents are NOT
(a) always the same temperature as the surrounding water.
(b) affected by the shapes of the continents.
(c) started by the wind.
(d) influenced by the Coriolis effect.
(e) one of the ways that heat is transferred from the tropics to the poles.
16. An exothermic reaction is one where:
(a) a high temperature is needed to run the reaction.
(b) heat energy does not need to be applied to start the reaction.
(c) heat energy is not a factor.
(d) heat energy is used up.
(e) heat energy is given off.
17. What type of reaction does the following equation represent?
Ag 2 S Æ 2Ag + S
(a) single displacement (b) synthesis (c) combustion
(d) double displacement
(e) decomposition
18. A solution has a pH of 8. How is this solution best described?
(a) strongly basic (b) slightly basic (c) slightly acidic
(d) strongly acidic
(e) neutral
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19. According to the "collision model,” the rate of a chemical reaction could be increased by which of the
following?
1. carrying out the reaction at a higher temperature
2. adding a catalyst
3. increasing the surface area of solid reactants
4. increasing the concentration of reactants
(a) 1, 2, and 3 only (b) 1, 3, and 4 only (c) 1, 2, and 4 only
(d) 2, 3, and 4 only (e) 1, 2, 3, and 4
20. Select the balanced equation.
(a) 4 K + 4 H2O Æ 4 KOH + H2
(b) 3 Mg(OH)2 + 2 H3PO4 Æ Mg3(PO4)2 + 4 H2O
(c) FeS + 2 HCl Æ H2S + FeCl2
(d) 2 Fe + 4 HCl Æ 2 FeCl3 + 2 H2
(e) 2 ZnS + 2 O2 Æ 2 ZnO + 2 SO2
21. Which of the following is a vector quantity?
(a) displacement (b) speed (c) time (d) distance
22. The direction [S 20 o E] is the same as
(a) 70 o RCS (b) 20 o RCS (c) 290 o RCS (d) 310 o RCS
23. Average speed can best be defined as
(a) the speed at which an object is travelling at a particular instant;
(b) an object travelling at the same speed over a period of time;
(c) the total distance covered over the total time measured;
(d) the rate of change in speed.
24. Instantaneous speed and average speed are always the same when
(a) the time period they are measured in is very great.
(b) the distance traveled by the object undergoing instantaneous and average speed is the same.
(c) the speed is uniform or constant.
(d) the acceleration is changing per unit time.
25. Acceleration is defined as
(a) change in position over a period of time
(b) change in velocity over a period of time;
(c) same position over a period of time
(d) the time it takes for an object to go from position 1 to position 2.
26. An object covering less and less distance per unit time is an example of
(a) constant speed (b) speeding up (c) instantaneous speed (d) slowing down
27. Sabrina competes in marathon races. If the length of the races remains the same and her times
decrease, what is happening to her average speed?
(a) Her average speed remains the same.
(b) Her average speed decreases.
(c) Her average speed increases.
(d) You cannot tell from the data given.
28. An object is thrown vertically upward. At the top of its trajectory
(a) its velocity is zero and its acceleration is zero
(b) its velocity is zero and its acceleration is 9.8 m/s 2 down
(c) its velocity is zero and its acceleration is 9.8 m/s 2 up
(d) its velocity is 9.8 m/s down and its acceleration is zero
(e) its velocity is 9.8 m/s up and its acceleration is zero
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29. Examine the position-time graph below.
The motion that is shown on this graph can best be described as
(a) uniformly decreasing positive velocity (b) constant negative velocity
(c) constant negative acceleration
(d) uniformly decreasing negative velocity
30. A blue jay flies at 10 km/h for 320 km [N]. How long would this journey take it?
(a) 32 h (b) 3200 h (c) 0.031 h (d) 3200 h [N]
31. A person kicks a soccer ball from rest to a velocity of 20 m/s [towards the goal] in 0.5 s. The
acceleration of the ball is:
(a) 20 m/s 2 [away from the goal]
(b) 0.025 m/s 2 [towards the goal]
(c) 40 m/s 2 [towards the goal]
(d) 10 m/s 2 [away from the goal]
32. If a car starts from rest and accelerates at +2.5 m/s 2 for 5.0 s, it will have a final velocity of
(a) 0.5 m/s (b) 7.5 m/s (c) 12.5 m/s (d) 2.0 m/s
PART B - WRITTEN RESPONSE
(Allow 60 minutes)
(55 marks)
33. Yeast are single celled fungi that use sugar as a food supply. When deprived of oxygen, they convert
sugar to carbon dioxide gas and alcohol. This reaction releases energy, and the yeast use that energy
to grow and reproduce rapidly. Alcohol is toxic to the bacteria.
An experiment was conducted over a period of nine days. The purpose of the experiment was to
examine the growth pattern of yeast. The experimenters placed a sample of yeast in a sterilized
molasses and water mixture and counted the population each day. The graph below summarizes the
results of their experiment.
Population
(cells/mL)
80
70
60
50
40
30
20
10
0
1 2 3 4 5 6 7 8 9
Days
(a) Explain and give reasons for the population pattern from days 1 through 6. [1 mark]
(b) Explain what might have caused the change in the growth pattern from day 7 through 9. [1 mark]
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34. List 2 benefits and 2 costs that the use of biotechnology for food production may have for society
and the environment? [2 marks]
35. Rabbits are not indigenous to Australia. They were brought to Australia as a meat source for the
European settlers. At some point some of the rabbits managed to escape into the wild where there
were no natural predators. Note that the Dingo, a type of wild dog which is indigenous to Australia
is not native to the area in which the rabbit was introduced. Sheep rearing was and still is a major
activity throughout much of rural Australia.
(a) Give the sheep containing food chain which the Australian settlers desired. [1 mark]
(b) Describe the direct effect that the introduction of the rabbit would have upon the desired food
chain? [1 mark]
(c) Describe any additional effects would this have on the ecosystem and the economy over a period
of time? [1 mark]
(d) Propose a possible method of solving the rabbit problem in Australia? Discuss how this would
work and its possible ecological consequence.[2 mark]
36. When carbon dioxide gas is dissolved in water, some of the gas reacts to form carbonic acid.
Bromothymol blue indicator turns yellow in the presence of acids. The figure below describes an
experiment in which bromothymol blue indicator was added to each of four test tubes.
All of the test tubes were stored near a window and at the same temperature. The test tubes were
observed at the beginning of the experiment and after two weeks. Observations from the experiment
are recorded in the Table below.
Test Tube Initial colour of the water plus
indicator
1 dark blue dark blue
2 dark blue dark blue
3 dark blue yellow
4 dark blue light blue
(a) Explain why test tube 3 changed colour, but test tube 2 did not. [2 marks]
(b) Explain why is there little change in colour in test tube 4? [1 mark]
Final colour of water plus
indicator
37. Explain why clouds form if the air temperature drops quickly like it does during a solar eclipse.
[1 mark]
38. Northern towns such as Moosenee on the shore of James Bay are not appreciably farther away from
the sun than cities close to the equator such as Mexico City and yet the average temperature in
Moosenee is much lower than that of Mexico City. Explain. [2 marks]
39. Explain how the specific heat capacity of water allows it to influence weather. [2 marks]
40. Explain the interaction of convection currents and the eastward rotation of Earth in producing the
northeast trade winds in the Tropic of Cancer. [3 marks]
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41. With the aid of diagrams, explain the role of convection currents in the three stages of a
thunderstorm. [3 marks]
42. Give the compound name or formula as required. [6 marks]
(a) K 2 S
(b) sodium oxide
(c) iron(II) bromide
(d) SO 2
(e) silicon tetrabromide
(f) dichlorine monoxide
43. A shiny, substance (X), which can be shaped and which is an excellent conductor of electricity, is
burned in air to produce a white solid (Y). When this solid is placed in water, it slowly dissolves to
form a colourless solution (Z).
(a) What kind of substance is X? Explain. [2 marks]
(b) What kind of substance (bonding) is Y? Explain [2 marks]
(c) What kind of solution is Z? Explain. [2 marks]
44. The antacid preparation Maalox contains aluminum hydroxide (Al(OH) 3 ) and magnesium hydroxide
(Mg(OH) 2 ).
(a) What kind of compounds are aluminum hydroxide and magnesium hydroxide? [1 mark]
(b) Explain how Maalox decreases the excess hydrochloric acid in an upset stomach. [1 mark]
(c) Write balanced chemical equations which illustrate the reaction between each active ingredient in
Maalox that reacts with the excess stomach acid (HCl) [3 marks].
(d) You want to design a new antacid tablet that is as small as possible, yet is as effective at
neutralizing stomach acid as larger ones. Considering the chemical equations in (c) above, which of
these substances would you choose to be in your new tablet? Explain your choice. [2 marks]
45. A dog leaves home and runs 30 m [E], then turns and runs 60 m [N 30 o W]. By means of a scale
diagram, determine the dog’s final displacement. [3 mark]
46. Consider the following position versus time graph.
position (m [W] of home)
40
30
20
10
0
-10
5 10 15 20 25 30 35
time
(s)
-20
Using the above graph, determine each of the following. Where a mathematical solution is required,
show your work.
(a) the average velocity during the first 10 s. [2 marks]
(b) the displacement during the first 20 s. [1 mark]
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47. Consider the following velocity versus time graph.
velocity (m/s [N])
15
10
5
0
-5
2 4 6 8 10 12 14
time
(s)
-10
Using the above graph, determine each of the following. Where a mathematical solution is required,
show your work.
(a) the instantaneous velocity at t = 3.0 s. [1 mark]
(b) the acceleration at t = 6.0 s. [2 marks]
48. A car, initially traveling at 20 m/s [N] accelerates uniformly at 1.6 m/s 2 [N]. Determine
(a) its velocity after 4.0 s. [2 marks]
(b) the distance traveled by the car during the 4.0 s time interval. [2 marks]
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SNC 2D1 FINAL MARK SHEET – JUNE 2001
Remove this sheet form the examination booklet for ease of use.
Please check (X) the name of your teacher
® Miss. E. Brown Time 1.5 h
® Mr. R. Fowler Date
® Mr. J. Roberts Place
® Mr. D. Sutherland
NAME:_________________________________________________________
PERIOD: ______
PART A – MULTIPLE CHICE ANSWER GRID
Please indicate your answer by marking an “X” through the letter of your choice.
1. a b c d e 21. a b c d e
2. a b c d e 22. a b c d e
3. a b c d e 23. a b c d e
4. a b c d e 24. a b c d e
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6. a b c d e 26. a b c d e
7. a b c d e 27. a b c d e
8. a b c d e 28. a b c d e
9. a b c d e 29. a b c d e
10. a b c d e 30. a b c d e
11. a b c d e 31. a b c d e
12. a b c d e 32. a b c d e
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