Uk1 Chemistry Form 5

8/7/2019 Uk1 Chemistry Form 5

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SMK Simpang RengamCurricular Test (March 2011)

Name: Chemistry (Form 5)Time: 1 hour 30 minutes

1. Atom X has 20 neutrons and an electron arrangementof2.8.7. What is the nucleon numberatom X?

2. A balloon contains 6.02 x 1023 of gas particles.What is the number of moles of the gas in the balloon?[Avogadro constant: 6.02 x 1023 mor1

]

0.5 mol3.0 mol

1.0 mol

6.0 mol

Atom Molecule IonCopper Ammonia Potassium bromideAmmonia Copper Potassium bromidePotassium bromide Am m o nia Copper

Copper Potassium bromide Ammonia

8 CH3

D CH

5. Two elements are in the same group of the Periodic Table. Which property is the same for boelements?

A. Their electron arrangement

B. Their number of valence electronsC. Their m elting pointsD. Their physical states of matter

A Treatment of cancer8 Sterilisation of insectsC X-ray for body examinationD Dating for the age of fossils and artifacts



8. Which of the following is a property of ionic compound?

A. Need a lot of energy to break the bond in it.

B. Able to conduct electricity in solid state.C. Soluble in organic solvent.

D. Solid ionic compound consists of scattered particles.

9. Which of the following has strong electrostatic attractive forces between its particles?

A. Naphthalene B. Zinc oxide

C. Hydrogen chloride D. pentane

10. Element Z has the following properties:

• It has a high melting point.

• It acts as a catalyst.

What type of element is Z?

Halogen

Noble gas

Alkali metal

Transition metal

11. Relative atomic mass of calcium and bromine both is 40 and 80. Which of the followingstatement are true?

I 2 atoms of calcium has same mass as 1 atom of bromine

1 1 2 g of calcium has same number of atoms as 1 g of bromine gas

III 4 mole of calcium has same mass as 1 mole of bromine gas

IV 2 g of calcium contains same number of moles as 8 g of bromine gas

I and III only

I, III and IV only

1 1 and IV only

I, 1 1 , III and IV

12. A sample of oxide of metal X contains 2.07g of X metal and 0.32g of oxygen. What is theempirical formula of the compound?

[Relative atomic mass: X,207; O,16J

13. The melting points and boiling points of substance P and substance Q are shown in table

below.

Substance Boilin int I QC Meltin point rcP 95 10

Q -12 - 90

At room temperature. 25 QC, P and Q respectively. exists in the form of

gas and solid

solid and solid

gas and liquid

liquid and gas

14. Which of the following does not affect the rate of a reaction?

A Volume of reactant B Concentration of the reactant

C Temperatu re of reactant 0 Size of the solid reactant

A. More pieces is obtained

B A ti ti i i d



6. Table below shows the volume of carbon dioxide gas, CO2, collected in the reaction betwe

marble chips and dilute hydrochloric acid.

Time/minute

Volume of COicm

What is the average rate of reaction in the second minute?A. 1.25 cm3 minute-1 B. 2.50 cm3 minute-1

C. 5.00 cm3

minute-1 D. 12.50 cm3minute-1

7. A small amount of manganese(IV) oxide is used in decomposition of hydrogen peroxide. T

role of manganese(IV) oxide is to

A. Increase the number of particles that react.

B. Increase the energy of the particles that react.

C. Reduce the activation energy.

D. Reduce the effective collisions between particles.

Ex riment Tern erature

P 30°C

Q 40°C

The table above shows two experiments conducted at different temperatures but in similar

. conditions. Experiment Q has highe~ number of effective collision because

A. The particles of the reactions have more kinetic energy

B. There are less collision between particles

C. Particles of the reactant move randomlyD. There are more particles of the reactant

A CnH2n

C CnH2n+10HB CnH2n+2

D CnH2n+1COOH

A. Lime water

B. Bromine water

C. Dilute sulphuric acid

D. Sodium hydroxide solution

Answer ( Section A):

1 6 11 16



. Figure 1.1 shows part of the Periodic Table of the Elements. Q, R, T, X and Y do not represen

the actual symbol ofthe elements.

Group

Period 1

) Element T combines with element Y to form a compound.

Name the type of chemical bonds in this compound.



. An experiment is carried out to investigate the rate of reaction of zinc with hydrochloric acid.

Excess zinc powder is added to 20 cm3 of 0.2 moldm·3 hydrochloric acid. The volume of gas

collected at 30 second intervals is shown in Table 2.1.

Time Is 0 30 60 90 120 150 180 210 240 270

Volume of gas0.0 12.5 22.0 31.0 37.5 41.0 44.0 45.0 45.0 45.0

collected I cm3

) Use a graph paper, plot a graph of the volume of gas collected against time.

) '.' From the graph in (b), determine the rate of reaction at 120 s.

[1 ma

[3 mar

The experiment is repeated using exce zinc powder, 20 cm3 of 0.2 moldm-3 hydrochloric acid

and 5 drops of copper(lI) sulphate solution.

[1 maWhich experiment has a higher rate of reaction? Based on the collision theory, explain thedifference in the rate of reaction.



The reaction between calcium carbonate and hydrochloric acid will produce calcium

chloride, water and carbon dioxide gas. The chemical equation for the reaction is

shown below:

CaC03 + 2HCI ~ eaCh + H20 + CO2

(Q(E)3

Refer ihg to the information above, plan a laboratory experiment to investigate the effect of s

of' on the rate of reaction.Your planning should include the following aspects:

(a) Problem statement

(b) All the variables

(c) Hypothesis

(d) List of materials and apparatus

(e) Procedure

(t) Tabulation of data

Prepared by,

...4 .(ch~~"ftl~Kian)

Certified by,r

I~atv,~. .(Norizan SuranQHead of Science and Mathematics Departm



I 1 D 6 B 11 C 16 C

2 B 7 A 12 C 17 C -

3 A 8 A 13 D 18 A

4 C 9 B 14 A 19 B

5 B 10 0 15 D 20 B

-

No Mark

l(a) Y 1-

(b) 2.8.3 1

(c) R 1

Has stable / octet electron arrangement 1

(d) R,Q,Y,X,T 1. .._ ...

(e) Y- 1(f) Have the same number of shells occupied with electrons 1

(g) Transition element 1_.

h (i) Ionic bond 1

h (ii) Correct electron arrangement of ions T and Y

T"/ 1

Correct charge of ions T and Y 1

J ~ '? r . / 'I .-

\

I J - -~~ :; Total: 11 marks

NoI

Mark

2(a) The change in quantity ofthe product in a range of unit time. 1

(b) Zn + 2HCI -7 ZnCI2 + H2 1

© • -Both axis label wifh unit/ ' 1

• All points mark correctly 1

• Smooth curve plotted 1

(d) drawing of tangent line at 120s 1

range: 0.12 - 0.18 cm3S-l 1

(e) because the concentration of HCt decreases. 1

f(i) Act as a catalyst to increase the r.07 reaction 1

(ii)

•Experiment 1 1

" '" 1

• The presence of c;atalyst/ CUS04 provides an alternative path which 1

require a lower activation energy.

• Frequency of effective collision become higher 1

50 bO ' 1"0 f f J (j 0



No

3(a)

Marking Scheme

Able to state the problem statement correctly.

Sample answer' 0 ~

Does size of z''''c a ects e rate of reaction with slllphll ric a.eid?

Able to state the problem statement less accurately

Sample answer:

Does size of zinc affects rate of reaction?

To investigate the effect of size of zinc on the rate of reaction with

sulphuric acid.

Able tq make a hypothesis correctly

Sample answer:

When the size of zinc is smaller, the rate of raction increases

Able to make a hypothesis less accurately

Sample answer:

Rate of reaction increases when size of zinc decreases.

Smaller zinc particles affects the rate of reaction.

Able to give an idea of making a hypothesis.

Sample answer:

Size affects rate of reaction

Able to state all the three variables correctlyManipulated variable: size of zinc / zinc granules and zinc powder

Responding variable: rate of reaction / time taken to collect a fixed

volume of hydrogen gas

Fixed variable: Volume and concentration of sulphuric acid / sulphuric

acid

Able to state two variables correctly

Able to state one variable correctly

Able t list the apparatus and materials completely

1. Conical flask

BuretteBasin

4. Delivery tube with stopper

C D Stop watch

6. Triple beam balance

7. Measuring cylinder

Zinc granules and zi~ C~ C39. [o.l-1ooJ moldm-3sili~~eia-

Able to list the apparatus and materials less co pletely

1,2,3,5,8,9

Able to list an idea of the apparatus al')d materials

5,8,9

Mark

2



Able to list the steps of the procedures correctly

Sample answer:

1. A burette filled with water is inverted over a basin containing

water

2. The initial reading ofthe burette is recorded.

Sg of zinc granules is placed in the conical flask.

[20-100] cm3 sulphuric acid is measured and poured into a conical

flask.

5. The conical fI sk is fitted with delivery tube and the stopwatch is

started.

The burette readings are recorded at [10-60]seconds intervals.

® Steps 1 to 6 are repeated by replacing zinc granules with zinc

powder.

Able to list the Steps 3,4,6 and 7 correctly.

Able to present a table to record the following items correctly

• Time

• Burette readings

• Volum e of gas

• Minimum three empty columns

Sample answer:

Time (s)

Burette reading (cm3)

Volum e of hydrogen gas (cm3)

Able to present a table to record the following items correctly 2

• Time

• Burette readings

• Minimum two empty columns

Sample answer:

I

Time (s)

Burette reading (cm3)

Able to give an idea on tabulation of data, at least one information stated 1

in the table

• 2 x 2

• One information

Sample answer:

Time II Burette reading I I

Volume of hydrogen gas

Uk1 Chemistry Form 5

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