SEC2/SC! [SA1] 237

ZHONGHUA SECONDARY SCHOOLMid-Year Examination 201 6

CANDIDATENAME

CLASS

stx00t

EHOTEHUA

stc0ll0tsl

( )

2 t

LOWER SEGONDARY SCIENCE

Secondary2 Express

Set by: Ms Rozianna I Ms Lin Jiaxuan / Mr Ong Kai KunVetted by: Mr Lawrence Tang/ Ms Ong Lay Hong/ Ms Rozianna

11 May,2016

2 hours

READ THESE ]NSTRUCTIONS FIRST

Write your name, index number and class in the spaces at the top of this page and on allseparate answer paper used.

Write in dark blue or black pen.

You may use a pencilfor any diagrams, graphs or rough working.Do not use staples, paper clips, hightighters, glue or correction fluid.

Section AThere are_ thirty questions on this paper. Answer alt questions. For each question there arefour possible answers A B, C and D.

Choose the one you consider conect and record your choice in soft pencil on the separateOTAS Answer Sheet.

Section B

Answer all questions.

Write your answers in the spaces provided on the euestionpaper.

Section C

Answer all questions.

Write your answers in the spaces provided on the Questionpaper.

The number of marks is given in brackets [ ] at the end of eachquestion or part question.

AII essential working must be shown clearly.

A copy of the Periodic Table is printed on page 24.

For Examine/s Use

Section A

Section B30

Section C40

Total

This document consists of 24 printed pages, including this cover page,

30

SEC2/SC! [SA1] 238

2

1

Section A

Answer all the questions.

Boiling potatoes destroys their cell membranes. A peeled, boiled potato strip isplaced in a concentrated solution of salts.

boiled potato

concentated solutionof salts

What process took place in the above experiment?

key

r' = takes place

x = does not take place

The graph below shows how the rate of diffusion changes with a factor X.

rate of diffusion

factor X

The factorXcould beP a

2

or

osmosis diffusionA

B

G

D

r

*

J(

*

P oA

B

G

D

concentration gradient

concentration gradient

diffusion distance

diffusion distance

size of diffusing molecule

surface area over which diffusion occurs

size of diffusing molecule

surface area over which diffusion occurs

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SEC2/SC! [SA1] 239

3

3

Which of the folloruing best describes the difference between active transport andpassive transport?

active transall types of particles

from lower to higher concenfation

does not require a selecfivelypermeable membrane

does not require respiration

A

B

c

D

water only

from higher to lower concenhation

requires a selectively permeablemembrane

requires respiration

some yellow fumes are released into the @mer of an enclosed room. After sometime, it can be observed that the fumes are uniformly dispersed in the room.

Which of the following statements best describe what happens to the fume particlesin the room?

A They diffuse uniformly to the rest of the room.

B .Th.ey diffuse by random movement to the rest of the room until they areuniform Iy distributed.

C They moved uniformly throughout the room by active transporl

D They moved uniformly throughout the room by osmosis.

A human red blood cell is placed in a concentrated gtucose solution.

ln vtrhich direction will the water molecutes move and what is the effect on the cell?

4

5

water molecules effect on cell

A

B

c

D

move into the cell

move into the cell

move out of the eell

move out of the cell

cell increases slightly in size

cellundergo lysis

cell decreases slightly in size

no change in cellvolume

6

SEC2/SC! [SA1] 240

4

The term, biomass, refers to

A the total weight of all organisms [n a food chain.

B the totalweight of all organisms in a trophic level.

C the total dry mass of all organisms in a food chain.

D the total dry mass of all organisms in a trophic level.

7 The diagram shows a food chain.

lf hawks are removed from the food chain, what is the short term effect on the numbers of

the other organisms?

The diagram shows a pyramid of numbers in a woodland ecosystem.

At which trophic level are the individual organisms largest in size?

I

lettuce hawksgreenflies ladybirds insect-eatingbirds

greenflles ladyblrds insect-eating birds

A

B

cD

decrease

decrease

lncrease

increase

increase

increase

decrease

decrease

decrease

increase

decrease

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I The diagram shows a carbon cycle.

5

carbon dioxidein the air

\carbon compounds

in green

/./r

compounds'

plants

10

carbonin animals

l,carbon compounds in

rnicroorganisms whichcause decay

Which three letters representthe process of respiration?

A P,QandR

B P, Qand S

C S,TandV

D T, UandV

The diagram shows organisms feeding on a dead rat and one of the organisms which, inturn, feeds on thern.

I

Which of the following is needed to complete the food chain?

A predator B producer

C sunlight D water

sECz/SCr [SA1] 242

11

6

The characteristics of blood taken from a particular human blood vessel are listed belou

t high oxygen concentration2 high blood pressure3 lower carbon dioxide concentration

Which blood vessel did the blood sample most likely come from?

A aorta B Pulmonary artery

C pulmonary vein D vena cava

12 The diagram shows the cross sectlonal view of three types of blood vessels X, Y and Z.

Y

allows fluid to passthrough wall

carries fluid high inpressure

A

B

cD

X

Y

z

Y

X

z

X

13 Which sequence shows the shortest route taken by blood travelling from a leg to an arm inthe human body?

A leg -+ heart + lungs -'+ kidney --) arm

B leg --* 1ung5 + heart + stomach -) arm

G leg -+ kidney --* heart -* lungs -r olrll

D leg -+ heart -+ lungs -r heart --+ etffTl

zx

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15

16

7

14 How do veins dffier from afieries?

The diagram represents part of the circulatory system.

Where is the blood pressure lowest?

right sidesf heart

D

c

A

B

left sideof heart

The testes are found within the scrotum outside the body because

A it is easier to differentiate the male from the female

B the temperature in the body is loo low for fie sperms to survive

C the temperature outside the body is most suitable for the production andstorage of sperms

D there ls no space to keep inside the body

width of lumen elastic fibres muscles in wallA

B

G

D

wider

wider

narrower

narrower

more

less

more

less

rnore

less

less

more

sECz/SCr [SA1] 244

17

18

19

8

The fertilisation of the egg usually takes place in the

A ceMx B ovary

C oviduct D uterus

Which of the following shows the correct sequence of events?

A fertilisation ) ovulation ) menstruation ) implantation

B implantation ) fertilisation ) ovulation ) menstruation

C menstruation ) ovulation ) fertilisation ) implantation

D ovulation ) fertilisation ) menstruation) implantation

Which of the following chemical substances is responsible for changes in the lining

of uterus in a woman's menstrual cycle2

{ oestrogen2 progesterone3 testosterone

A l only

C 2and3only

B land2only

D f,Zand3

20 Which of the statements below about birth control melhods is conect?

A Contraceptive pills are consumed to prevent ovulation.

B Ligation is an option for couples who are considering a temporary birth controlmethod.

C The spermicide is usually used together with a diaphragm to kill sperms.

The intra-uterine device (lUD) is inserted to prevent the implantation of eggsin the fallopian tube.

21 What is the electronic structure of an atom with a proton number 5 and a nucleonnumber 11?

2,3 2,4

D

B

D

A

c 2,8,1 2, 8,6

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I22 The electronic strucfure of an element is shown.

key

@ electron

l") nucleus

Which diagram shows the electronic structure of another element in the same group inthe Periodic Table?

A

c D

2? The electronic configuration of an ion is 2.g.9.

What could this ion be?

s2. c*,A x x

B JC

c rD

,

A

tI

ItIt

sECz/SCr [SA11 246

10

24 The nucleon number and proton number of the lithium atorn are shown by the symbol

I r-,.

What is the correct symbol for the lithium ion in lithium chloride?

ALi-

GLi-

25

element electronic strucfure

wxY

Z

2,42,8

2,8,12,8,7

WandX B WandZ

XandY D YandZ

26

6t

Which two elements react together to form an ionic mmpound?

6t

73

B

D

LT

Li"13

A

c

The diagram shows the structure of methane.

HII

H-C-HIIH

What is the total number of outer electrons used for bonding in this molecule?

A284

c8 D10

27 An element, Q, is in the same group of the Periodic Table as chlorine. Which of thefollowing can be a formula of a compound containing Q?

NaeQ B AlO2

D MgQt

A

c CaQ

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11

28 An aqueous solution of the organic compound methylamine has a pH greater than 7

Which statement about methylamine is conect?

A lt neufarises an aqueous sorution of sodium hydroxide.

B It reacts with copper(il) carbonate to give carbon dioxide.

C lt reacts with hydrochlonb acid to form a salt.

D It turns blue tibnus red.

29 which of the foilowing does not react with dilute sulfuric acid?

A magnesium metal B magnesium nitrate

C magnesium hydroxide D magnesium oxide

30 Ammonia may be obtained from ammonium chloride by heating with

A agueous calcium chloride

C dilute hydrochloric acid

B aqueous sodium hydroxide

D water

12

sECz/SCl [SA11 248

for Eiamlner's Use

Section B30

Section C 40

Total

Zhonghua Secondary School

Mid-Year Examination 201 6

Secondary 2 Express

NAME: ()

CLASS:

Section B

Answer all the questions.

write your answers in the spaces provided on the question paper.

B1 At -2S0 oC, a sample of liquid air contains a mixture of oxygen and nitrogen. The boiling

points of nitrogen and o4ygen are as shown in Table 1'1'

Table 1.1

substance boiling point / oC

nitrogen

oxygen

-196

-183

(a) A sample of liquid air in a container is allowed to warm up slowly.

With reference to Table 1.1, complete Table 1.2 below with the states of nitrogen

and oxYgen resPectivelY-

Table 1.2

temperature(s) state(s) of nitrogen state(s) of oxYgen

from -250 oC to'196 oC liquid

at -196 oC

from - 196 oC to -183 oC liquidtzl

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13

sECz/SCl [SA11 249

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['otal:5]

(b) ln the space below, sketch to show how the temperature of the sample of the liquid airmixture will change as the sample is warrned up irorn -2s0 ,c to -iso oc.

82 Fig- 2.1 shows the energy flow in kirojoures (kJ) through a food chain.

respiration2040 kJ respiration

light from thesun

waste products1178 kJ

Fig.2.1

(a) what is the amount of energy in kJ taken in by the herbivore? show your workingclearly.

(b) Calculate the percentage of energy taken in by the camivore that is used forrespiration.

waste products12s kJ

11l

producer carnivore24 kJ in growth

herbivore330 kJ ingrowtir

t21

II

i

I

14

sEC2/SCl [SA1] 250

nl

(c) Based on the information in Fig. 2.1, construct a pyramid of energy.

(d)Suggestwhythisfoodchaincouldnothaveanothertrophiclevel.

t11

B3 Fig 3.1 shows a longitudinalsection through a human heart'

Fig 3.1

(a) Use label lines and the letters P and Q to label the following on Fig 3.1.

P pulmonary artery O semi-lunar valve

fotal:51

l2l

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(b)

Fis.3.2

(i) Name the blood vessels shown in Fig 3.2 and state one likely effect of the narrowingof the blood vessels,

(iD state one way in which the condition in Fig 3.2 can be prevented.

15

Fig 3.2 is an X-ray showing narrowing in the blood vessels supplying muscles in theheart. A catheter is used to insert a Eye into the brood u"r."i. Jo tnat they appearclearly in the X-ray. The anows indicate where there is n.ir*tng of the bloodvessels.

t21

tl1

fiotal:5]

blood vessel

effect

I

'i

16

sEC2/SCl [SA11 252

t1I

B4 Fig. 4.1 shows a calendar page on which a woman has marked with a circle' the

first daY of her menstruation.

March 16

Fig.4.{

(a) on Fig. 4.1, circle any three consecutive days within the fertile period'

(b) Her menstrual cYcle has 28 daYs.

with reference to Fig. 4.1, when will the first day of her next period be?

l

(c) Fig. 4.2 and Fig. 4.3 below show the graphs for the menstrual cycle of the

"iin. wom"n on two consecutive months'

Tlricliness ot lheurall ol lhe uterus

Days

i5

r5

14

Fis.4.2

14

28

Thickness ol the

wall ol the ulerus

0ays28

SatFriThuTue WedMonSun

543I

1210 11II76

18 1s1716'14 1513

262523 24222120

31302927 28

Fis.4.3

@

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sECz/SCr [SA1] 253

17

(i) Narne the hormone that is responsible for the thickening of the uterine riningafter ovulation.

(i0 Acmunt for the difference in thickness after Day 2g observed in bothFig.4.2 and Fig. 4.3.

fl'otal:51

Table

tu

t21

B5 Table 5'1 shows the atomicstrucfure of six particles, represented by the letters A to F. Theparticles are atoms or ions. The letters are not trre symbols of tre etements.

Use the letters A to F to answer the following questions.

(a) Which particte has the greatest atomic mass?

particle electron protonA 6 6B 2c 12 12

1 12 12E o 6 IF 10 13 14

11I

(b) Which particle is an atom in Group 0?

t1I(c) which two particles are an atom and an ion of the same element?

t1l(d)

(e)

Which two particles are isotopes of the same element?

11I

Which particle is an atom of a metallic element?

11I

[-otal:5]

neu ron

2

D

I

18

BG The equations below show two chemical reactions of sulfuric acid'

Both reactions produced the same salt B'

SEC2/SCI [SA11 254

+ gas G

t3l

compound A

magnesiumoxide

sulfuric acid

sulfuric acid

+

+

-4

+

salt B

salt B

water

water

+

+

(a) write the chemicalformula of the compounds labelled A, B, and c.

B:

A:

C:

(b) Describe a simple chemical test to identifo gas C

121

['otal:5]

I

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19

Section C

Answer all questions.

Write your answers on the lined paper provfded.

c7

Fig.7.1

(a) ldentifo cell A and substiances B and C:

A,

B

c

(b) Blood capillaries connect arteries to veins.

(i) What is the main tunction of a blood capillary?

Fig' 7'1 shows a blood gaoillav and some living cells found near it. The arrows representexchange of substances B and c between riving 6ils ana nrooo capi[ary.

tsl

(ii) How does the structure of the blood capillary make it welt-suited for its function?

t1l

12)

sECz/SCr [SA1] 256

20

(c) Describe how substances B and c move across the capillary wall.

12l

(d) Besides cell A, there is another type of cell usually found in blood' Name the cell and

state its function in the human circulatory system'

fl'otal:12)

101

CB Fig. 8.1 shows the male reproductive system'

Fis.8.{

(a) Name the following Parts.

P

o l2l

(b) Explain how the functions of parts Q and s are related to each other

P

o

R

S

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SECz/SC! [SA1J 257

21

(c) A couple decides on a permanent birth controt mefrod which involves cutting andtying of pafi R of the male reproductive system

{i) Name this male sterilisation method.

(ii) Explain how this sterilisation method is an effective permanent birth controlmethod.

(d) Fig. 8.2 shows a diagram of a sperm.

Fis. B.2

(i) ln order forfertilisation to be successful,.the sperm has to penetrate tre egg.This is possibre when an enzyme is rereased fr"* p"; I-of the .p"rr"iobreak down part of the egg membrane.

on Fig. 8.2, raber the part X which rs responsible for releasing the enryme.

(ii) A student claims that a par of identical twins is produced when an egg isfertilised by two sperms to form two zygotes

state whether the sfudent's craim is true orfalse. Explain your answer.

11I

fl-otal: 101

sEC2/SCl [SA1] 258

22

Cg Hydrogen chloride, HCl, is a compound

Draw a dot-and-cross diagram to show the bonding in a molecule of hydrogen

chloride. Show only the outer electrons.

(b) State the type of bonding present in hydrogen chloride'

(c) Hydrogen chloride dissolves in water to form an acidic solution (hydrochloric

acid).

(ii) which one of the following values is most likely to represent the pH of a dilute

solution of hYdrochloric acid?

Circle the correct answer.

pH 2 PH7 PH{0 PH14

(d) A student added some zinc powder into the test tube containing dilute

hydrochloric acid'

(i) Give the chemical formula of the products formed'

(ii) Describe a simple test to identify the gas produced'

(iii) The student repeated the experiment by replacing d.ilute hyd.rochloric acid

with dilute sulfuric acid. Give the chemital name of the salt that is formed'

(a)

l2I

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Describe how you would use ftfmus paper to show that this solution is acidic'(i)

t1I

t11

t21

l2l

t110lfotal:1

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23

CI0 Two isotopes of potassium are sK and {K(a) Define the term rbofopes.

sECz/SCt [SA1] 259

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tll

121

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(b),?:gi3::#:.t:ble

about the number of partictes found in one atom of each of

number ofprotons number of

seK

+o6

(b) Potassium readityforms potassium oxide when reacted with o:rygen in air.(i) Write the chemicalformula of potassium oxide

t21

#':g"ffi"ffihow the potassium ions and oxide ions are formed in terms

(ii,) Draw a dot-and-cross diagram to show the bonding in potassium oxide.Show only outer etectror" ii-v"riaAglr.

(iv) Give the chemicar.name and chemicar formura of the sart that is formedwhen potassium oxide reacts witf, nitric acia.

(i,)

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121

chemicalname:

chemical formula:

number of -electrons

0

Nencofl

Ararg0n

Hatplium

BO

Br75AsZn

dncNi

nlckelCo

@baIFelron

; 5ntin

A.PbErd

Au0fiTaBa

blrim

Hhy*ogen

ocBfiuo(haoxrgcncarbon rritrwenbomnBeLi

fitHum ter)ilh/m

crP sSiA, drlodnsrrdt!trsllconal.mlnlunNa Ieodiwn

SeGeGaCu bromhoMn ars!nlc seleniunCrTiScCaK ciromlumrxrcduntlmlmttalchm 6candium

201sbtncdRh iodnsRu ar*rmonyhfirsrZr cdmlumY

Agilr'erSTRb ftodrrontharim 535150ricodum 4948drorilum 47ruUdum 444340

ytt.iun39€o87

BiPt HgIrOsRe UstDrdhwHfLa msarryCs lfi4mNniumfionlunta.{olLrr} lungCeoha!nlwrtlmthrnmcaerirrt

adatine

Pdpdladun46

P"polori.mB4

1

F1

N

Tetclurfum

62Nb

nioblun41

Momdlbddu

m42

TIth5!Um

alKrl

rrrdon Is6 I

131 I

XelI rcnon I

54

86

R.18do.l

A;r,llnlum89 IB8

R,radiun

i,fandum

a7

Ns

'5&71 Lanthanoid series

t90-103 Actinoid series

a = relaltvB at0mi6 mass

x = atornlc Eymbol

b = proton (alomlc) nunbsr

The volume of one mole 0f any gas is 24 dm3 at room tempBrature and pressure (r't'p')

U'mol\)U)a-U)

l\)CDo

a

Xb

l(ey

Cecarlum

141Pr

144Nd P; Sm

samaduo62

52Eu

auroplrnGd

159Tb

tartsum

65

Dy165Ho

hofnfum

6?

Ererlium

169Tm

llr,llium

69

173Yb

)tteDlurr70

175Lu

lultllum71

59G

noMlum1(D

;lawpnciumt03

;Dnleddm95

c;crrlurr

96

;,bctkelLlm

CJcili6tr{um

;ehsrglnlrn

F;hrmhm

Md232Th

lhodun90

Pa2sBU

urmlm92

N;nEFturItrng3

P,ptdonlum9d

91

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2E LSS MYE 2016 Answers

Section A

Se-ction g

1.C 2.C 3.D 4.B 5.8.D 9.8 10. B6. c-

D1 I

14. B----- 15. 16. C 17.Cz.

25.D 26.C 27.D 28.C24.D30. B---

Qn AnswerCa

temperature(s) state of nitrogen state of oxygen

from -250oCto-196oC

from - 196 oC to -1g3 oC

at-196 oC rifiEiilffiffia'S

liquid

ues

iifiiiid

fifrfrid

liquid

4xYzmark

[-otal:2]

BlbTemperaturq/ '(

'Ilme/min

-180

-250

shape %

2xTzforconstanttemp at-1960cand -183oc

['otal:2]

%

Answers Marks2(a) Energy= 2040

taken in 6y+ 330 + 1178

%

2(b) Percentage= (330 -24

of forusedenergy254

I I 330 x 1i) 00o/o1

1cfor conect

sEcz/scl [sAl] 262

Yzfor correctlabels

carnivore

herbivore

producer

one trophicnext trophic

energytotransfer0%Iless

toIlevel

The amount

for the IC

1

in

O

1 each

P pulmonary arteryQ semi-lunar valve

1

1heart

1cholesterol:Any

reduceIfoodreduce fattystress management;avoid smoking:

1

[Circle either. Any3

of the following:tonsecutive d-ays from i--s-$;tfii!i h

B4a

12A16B4b

1Progesterone.oB4ci

%1/^

1

a

a

a woman's menstruation

ISshethatmeancouldThisfertilization.fortoistheof prepareliningthe thickeningas

Thebut

Bcii

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sEC2/SCt [SA1] 263

F numB5

n1

11l

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number

same of

number

have same number of

different number of

number of electron = 1c

AandE

B

C and

different number of

B6 (a)

(b)

111

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11I

rul

COe

A IS

A

B

c

i1l

Section C

Marks(a)B - carbon dioxide, ureaC - oxygen

- red1

1

1

For between blood and cells 1

(bXiD one

1,11,11,1

Bc from the

from

1

organismsto flght harmfulagainstharmful

1

1

1

1

C8a Po epididymis 1

1

c8b a will such

a

(oart S) before they are released into the sperm ducts.

The

Theas

1

1

(a)

(b)

(c)

(d)

(el

1

9pi1ms are,r.gJg.?F,gq tfertilisation canngt opcuf

a

a

spetm ductsor penlg.

(As iheurethie.

occur,

thefrom enteringcannotare cut, sperms)

butn stillca noEjaculationbecan released,noSince spenn

CScii

I

1

1The claim isa

o

bond

tr ll

el

t1l

t11

t21

nl

11lit will turn

into the test tube

lntoof0 Put a

insert a

Zinc sulfate

(ii) pH 2

It will

(i)

(ii)

(d)

(b)

(c)

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the same of protons but

number ofprotons

number ofelectons

number ofneutrons

3eK 19 19 2A

40K 19 19 21

Each atom to a

Each atom to an !on

(b)

(a)

(b)

c1

(r)

(ii)

(iii)2-+

2

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11l

12)

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(iv)

ula:

chemicalname: