EST-400.A03 TThheeoorryy EExxaammiinnaattiioonn4dscience.pbworks.com/w/file/fetch/108852463/EST EXAM...

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Environmental Science and Technology Cycle 2, Year 2

(Secondary 4) EST-400.A03

TThheeoorryy EExxaammiinnaattiioonn

T im e : 2 h o u rs

Question Booklet

Environmental Science and Technology — Theory Examination Question Booklet EST-400.A03

BIM Société GRICS Page 1

INSTRUCTIONS

1. Write the required information on the title page of the Answer Booklet. 2. This examination consists of two parts. Part A: 10 multiple choice questions,

Part B: 10 constructed response questions. 3. Answer all questions in the Answer Booklet, showing all your work. 4. You are permitted to use writing instruments, a scientific calculator without a

graphic display and a ruler.

To ensure fairness to all students graphing calculators or any other type of calculator that stores information should not be used. Memory aids and electronic devices such as, cell phones, MP3 players, cameras, etc. are prohibited.

5. You may refer to the information provided in the Appendices of the Question

Booklet. The use of any other reference material is strictly forbidden. 6. The rules of significant figures should be applied to all final statements. Note: Figures are not necessarily drawn to scale.

Time: 2 hours



Part A: Multiple Choice Questions Questions 1 to 10

Answer all the questions in your Answer Booklet.

Question 1 Oxidation causes many problems in industry.

Which of the following balanced equations represents an oxidation reaction?

A) C3H8 + 5 O2 3 CO2 + 4 H2O

B) 6 CO2 + 6 H2O + energy C6H12O6 + 6 O2

C) 2 NaOH + H2SO4 Na2 SO4 + 2 H2O

D) Pb(NO3)2 (aq) + 2 KI(aq) PbI2 (s) + 2 KNO3 (aq)

Question 2 Your friend Mylihn is in CEGEP. She needs your help in reviewing the nature of chemical bonds.

Which of the following substances will form covalent bonds?

1. CCl4 2. Na2CO3 3. PBr3

4. KCl 5. N2 6. KF

A) 1, 2 and 3

B) 1, 3 and 5

C) 2, 4 and 6

D) 4, 5 and 6



Question 3 Whether you are working in a laboratory or in industry, it is important to understand that the position of the energy term in a chemical equation will tell you whether the reaction will be endothermic or exothermic.

Match the terms in the first column with the equations in the second column.

Type of Reaction Equations

I. Endothermic reaction II. Exothermic reaction

1. 4 Fe(s) + 3 O2(g) 2 Fe2O3(s) + 1648.4 kJ

2. NaCl(s) + 4.3 kJ Na+(aq) + Cl(aq)

3. CH3CH2OH(l) + 3 O2(g) 2 CO2(g) + 3 H2O(g) + 1367 kJ

4. N2(g) + O2(g) + 104 kJ 2 NO(g)

A) I-1, I-3, II-2, II-4

B) I-1, I-4, II-2, II-3

C) I-2, I-3, II-1, II-4

D) I-2, I-4, II-1, II-3



Question 4 The company “Cleanall” conducts tests in their laboratory to determine the toxicity threshold of their cleaning products. A technician adds a drop of a detergent to an aquarium containing a population of Daphnia (small crustaceans) every 10 minutes. She must determine the toxicity threshold of the detergent.

Daphnia

Enlarged 40 X

Which of the following statements indicates that the toxicity threshold for the detergent is about to be reached (but has not yet been surpassed)?

A) The Daphnia are behaving normally, 10 minutes after the beginning of the test.

B) The mobility of a few of the Daphnia is reduced, 20 minutes after the beginning of

the test.

C) Half of the Daphnia are dead, 30 minutes after the beginning of the test.

D) All of the Daphnia are dead, 40 minutes after the beginning of the test.



Question 5

Which of the situations illustrated below represents a force of attraction?



Question 6 In genetics, every term has a very precise meaning.

Which of the following correctly matches each statement with the corresponding term?

Statements Terms

I. Remy is PPGg. II. Catherine has curly blond hair. III. Gabriel has blue eyes while his parents have brown

eyes.

1. Dominance 2. Genotype 3. Phenotype 4. Recessivity

A) I-2, II-1, III-3

B) I-2, II-3, III-4

C) I-3, II-4, III-2

D) I-4, II-3, III-1

Question 7 DNA is the molecule that allows us to code all genetic characteristics. During protein synthesis, new molecules are formed to facilitate this process. A strand of DNA is shown below.

AGC TAC CTG GAA GTT CCT

Which strand of mRNA below, corresponds to the strand of DNA above?

A) UCG AUG GAC CUU CAA GGA

B) UCT AUT TAC CUU CAA TTA

C) TCG ATG GAC CTT CAA GGA

D) TCG UTG GUC CTT CUU GGU



Question 8

Hydro-Québec operates one nuclear power plant, the Gentilly-2 generating station.

If there was an accident at the Gentilly-2 nuclear power plant, a radioactive cloud could be released, having negative consequences on all living organisms in the surrounding environment.

Therefore, it is important to understand how prevailing winds could disperse contaminants in the event of a nuclear meltdown.

Map of Québec

N

(G e n til ly -2 )

W E

S

Which of the numbered zones on the map above would be most affected by a radioactive cloud?

A) Zone 1

B) Zone 2

C) Zone 3

D) Zone 4



Question 9 A diagram of a child’s toy is shown below.

P u sh ro d

E le c t r ic c irc u it

T o y b o x

S p r in g

A x le

W h e e l

T ire

M E C H A N IC A L

S Y S T E M ?

Which of the following mechanical systems permits the movement of the push rod in the child’s toy?

A) Friction gear systems

B) Eccentric cam and connecting rod systems

C) Chain and sprocket systems

D) Rack and pinion systems



Question 10 Nicolas has decided to participate in the Engineering Challenge. This year he plans to build a racecar that can move around obstacles. He needs a resistor to slow down the motor. He asks

the laboratory technician for a resistor offering a resistance between 8 and 12 . She offers him the four resistors below. Refer to the Resistor Colour Code Chart in Appendix 4.

Which of the following resistors should Nicolas use?

C ) R e s is to r 3 :

D ) R e s is to r 4 :

B ) R e s is to r 2 : B

lac

k

Bro

wn

Bla

ck

Silv

er

A ) R e s is to r 1 :

Bla

ck

Bla

ck

Bro

wn

Go

ld

Bla

ck

Bla

ck

Gre

y

Go

ld

Bla

ck

Bro

wn

Re

d

Silv

er



Part B: Constructed Answer Questions Questions 11 to 20

Answer all questions in the Answer Booklet.

Question 11 Magnesium sulfate, MgSO4, is a chemical compound commonly called Epsom salt. It has been used for centuries to treat the following medical conditions:

Skin problems Cardiac arrhythmias Asthma Nail growth problems As a laxative or purgative for relief of occasional constipation

Source: en.wikipedia.org/wiki/Magnesium_sulfate

Your aunt Susan suffers from a skin problem. You offer to prepare a solution of magnesium sulfate, MgSO4, to ease her discomfort. Therefore, you must dissolve 35 g of MgSO4 in water, to produce 2.6 liters of solution.

What is the molar concentration of the solution?

Question 12 A welder has to cut a metal door with her acetylene, C2H2, torch. The following chemical equation represents the combustion of acetylene:

2 C2H2 + 5 O2 4 CO2 + 2 H2O

How many moles of CO2 will be released into the atmosphere if the welder uses 12 kg of acetylene to cut the metal door?



Question 13 Two students are playing hopscotch on a giant periodic table in the chemistry lab. The first student jumps to the alkaline earth group and lands on the element Beryllium (Be). The second student jumps to the oxygen group and lands on the element Sulfur (S).

Draw the simplified atomic models of these two elements in your Answer Booklet.

Question 14 You are asked to help your laboratory technician clean up the lab. You must classify the solutions and place them on the correct shelves in the storage room.

H C l N a O H M g C l2 H 2S O 4

a) Which of the solution(s) above contain polyatomic ions?

A l 2O 3

The flask above requires a label with the name of the solution.

b) Respecting the rules of nomenclature, record the name of the solution in your Answer Booklet.



Question 15 Kabira works for a security company. She has to go to a client’s house to add a new motion detector (R2) to a pre-existing electric circuit. The new motion detector has a resistance of

480 (R2).

The motion detector that is already installed (R1), has a resistance of 2400 (R1) and a current of 0.005 A (I1).

P o w e r

su p p ly

+

-

Ex

istin

g m

otio

n

de

te

cto

r

R1 =

24

00

I 1 = 0 .0 0 5 A

R2 =

48

0

Ne

w m

otio

n d

ete

cto

r

I 2 = A

What is the current intensity (I2) travelling through the new motion detector (R2)?



Question 16 A group of students are attempting to throw a 55 g ball as high as they can, vertically upwards. The record height that they have achieved so far is 6.0 meters. Jeremy wishes to break the record of 6.0 meters. He throws the 55 g ball vertically upwards with a speed of 11.2 m/s.

Will Jeremy exceed the record height of 6.0 meters? Explain your answer. Neglect air resistance.



Question 17 Amelia is preparing a pizza on an aluminum baking pan. She places the pizza in the oven. Ten minutes later she realizes that she forgot to add the cheese. She must take the pizza out of the oven to add the cheese.

The baking pan, which weighs 375 grams, was at room temperature (22C) before it was placed in the oven. It absorbed 9450 J of energy during the 10 minutes it was in the oven. The specific heat capacity of aluminum is 0.90 J/g°C.

What is the temperature of the baking pan when it is removed from the oven?



Question 18 Scientists often breed Guinea pigs to study genetic characteristics. In one experiment, they crossed a homozygous dominant black haired male with a homozygous recessive white haired female. They observed that all of the offspring were heterozygous black haired.

Characteristic of Guinea Pigs

Trait / Characteristic Dominant Allele Recessive Allele

Colour of hair Black (B) White (b)

The scientists then do a second cross between a homozygous dominant black haired male and a heterozygous black haired female.

a) State the genotype for both individuals in the second cross and draw the Punnett square that shows the offspring produced from this cross.

b) Give the phenotypic ratio of the offspring produced from the cross in

question a).

Question 19 The world population has now reached 7 billion people. This has led to a greater demand for food. Agriculture must find ways to increase food production. Several farmers have started using new fertilizers that cause plants to grow faster, resulting in larger harvests. The new fertilizers contain elements such as nitrogen, potassium and phosphorous. These fertilizers have a positive effect on the plant crops; however they also have an impact on the surrounding environment. A corn crop fertilized with the new fertilizer is situated near several streams which flow into a lake.

Describe two consequences of the widespread use of the new fertilizer on this lake ecosystem.



Question 20

Operation Sweep-Up at l’Érablière High School!

On October 5th, 1 100 students at l’Érablière High School participated in Operation

Sweep Up. The purpose of the activity was to clean up the schoolyard as well as the

surrounding neighborhood. Inspired by a new environmental awareness program called

SSBR (small steps, big results), the students went through the neighborhood with a fine-

toothed comb, picking up every piece of garbage in sight. An enormous amount of waste

was collected! The students also pledged to keep the neighborhood clean by picking up

two pieces of garbage every day until the end of the school year. The school’s

administration stated that in taking on this project, the students at l’Érablière High,

once some of the biggest polluters in the neighborhood, are becoming ambassadors for a

clean community! Article by Simon Gagné, in the daily newspaper La Revue de Gatineau on October 17, 2011. [Free translation]

This initiative has reduced the ecological footprint of the school.

Name four concrete actions that could reduce the ecological footprint of a community. Explain how each of these actions would reduce the ecological footprint.


BIM Société GRICS Appendices

Appendix 1

FORMULAS

V

mC

C: concentration m: mass V: volume

EW Δ W: work

E: variation in energy

RIV

V: potential difference R: resistance I: electric current

intensity

dFW Δ W: work F: force

d: distance travelled

...21

RRReq

Req: equivalent resistance mgFg

Fg: gravitational force m: mass g: gravitational field

intensity

...111

21

RRR

eq

Req: equivalent resistance mghEp

Ep: gravitational potential energy

m: mass g: gravitational field

intensity h: height

tPE Δ E: energy consumed P: power t: time

2

2

1mvE

k

Ek: kinetic energy m: mass v: velocity

VIP

P: power V: potential difference I: electric current

intensity

TmcQ Δ

Q: quantity of heat m: mass c: specific heat

capacity

T: change in temperature

2

21

r

qkqF

e

Fe: electrical force k: Coulomb’s constant q: charge of particle r: distance between

two particles



Appendix 2

QUANTITIES

NAME SYMBOL VALUE

Coulomb’s constant k 2

2

9109

C

Nm

Gravitational field intensity on Earth

g 9.8 N/kg or 9.8 m/s2

Specific heat capacity for water

c CgJ19.4

Appendix 3 Resistor Colour Code Chart

Colour Black Brown Red orange Yellow Green Blue Purple Grey White

Digit 0 1 2 3 4 5 6 7 8 9

Multiplier 100 101 102 103 104 105 106 107 108 109

Tolerance: gold 5%, silver 10%, none 20%



Appendix 4

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