assessment 1 form 5

8/7/2019 Assessment 1 Form 5

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SEKOLAH BERASRAMA PENUH INTEGRASI GOPENG

31600 GOPENG, PERAK

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ASSESMENT 1

2007

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CHEMISTRY

FORM 5

( 1 ½ HOUR )

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INSTRUCTION :

1. Answer all the questions in section A, section B and section C.

2. Section A: Please mark the correct answer in the answer sheet.

This question paper have 9 printed pages

DO NOT OPEN THIS QUESTION PAPER UNTIL TO DO SO

Prepared by, Checked and verified by,

……………………………

……………………………………(PUAN MASITAH BT ABU BAKAR ) (PN. MORDHIAH BT MORSHIDI)

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Section A :

Instructions : Question 1 to Question 15 are followed by four options A, B, C and D. Choose the

best option for each question.

1. Consider the chemical equation below :

Which of the following is the most suitable unit for measuring the rate of the above chemical

reaction?A. cm3 of hydrogen gas per second

B. grams of magnesium per minute

C. moles of sulphuric acid per minuteD. change of pH of the solution per second

2. The graph shows the volume of gas X evolved against time for the reaction between a

reactive metal, Y in excess dilute sulphuric acid.

The volume of gas X remains constant after 10 minutes because

A. the catalyst has finished reacting

B. Y has been used up

C. All the sulphuric acid has been used upD. The rate of reaction is constant

3. At room temperature, hydrogen peroxide will decompose slowly to form water and oxygen,as shown in the equation below :

How many moles of hydrogen peroxide are used in the experiment to obtain 4800cm 3 of

oxygen?(1 mole of any gas occupies 24.0 dm3 at room temperature)

A. 0.005 moles

B. 0.4 moles

C. 5 molesD. 10 moles

4. The table shows the volume of gas collected when calcium carbonate is heated.

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Mg (p) + H2SO4 (aq) MgSO4 (aq) + H2(g)

2H2O2 O2 + 2H2O



Time /min 0 0.5 1.0 1.5 2.0

Volume of CO2/cm3 45.00 35.00 20.00 18.00 10.00

Table 1

Calculate the average rate of reaction for the second minute.

A. 7 cm3 min-1

B. 9 cm3 min-1

C. 10 cm3

min-1

D. 18 cm3 min-1

5. The rate of reaction is directly proportional to

A. The temperature of the products

B. The size of the solid productsC. The mass of the catalyst

D. The concentration of the reactants

6. Which of the following will not affect the rate of reaction between calcium carbonate and

hydrochloric acid?

A. The size of the conical flask usedB. The size of calcium carbonate usedC. The temperature of the hydrochloric acid

D. The concentration of hydrochloric acid

7. Two experiments were conducted to study the rate of reaction between excess calcium

carbonate and sulphuric acid as shown below.

Experiment Sulphuric acid

I 25 cm3 H2SO4, 1 mol dm3

II 50 cm3 H2SO4, 0.5 mol dm3

Which of the following graph best describes the result of the above experiments?

8. The graph below shows the result of two experiments, I and II. In experiment I, excess

magnesium was reacted with 20 cm3 of hydrochloric acid, 0.5 mol dm3.

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Which of the following would give the result for experiment II? Adding magnesium to

A. 20 cm3 of hydrochloric acid 1.0 mol dm3

B. 20 cm3 of hydrochloric acid 0.2 mol dm3

C. 40 cm3 of hydrochloric acid 0.5 mol dm3

D. 10 cm3 of hydrochloric acid 0.5 mol dm3

9. The rate of a reaction decreases with time because the

A. concentration of products has increased

B. concentration of reactants has decreasedC. temperature of the reaction has decreased

D. the pressure of the container has increased

10. Which catalyst is used in the contact process?A. Iron

B. Platinum

C. Copper (II) oxideD. Vanadium (V) oxide

11. A reaction is faster when a catalyst is used becauseA. the number of particles of the reactants decreases

B. the number of particles of the products decreases

C. there is an alternative path with lower activation energyD. the effective collision frequency is reduced

12. State the activation energy for the energy diagram shown.

A. X kJ mol-1

B. Y kJ mol-1

C. (X-Y) kJ mol-1

D. (Y-X) kJ mol-1

13. The following are carbon compounds except

A. starchB. glucose

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C. hormones

D. limestone

14. All atoms in hydrocarbons are bonded by

A. ionic bonds only

B. covalent bonds onlyC. covalent and ionic bonds

D. double covalent bonds only

15. A structural formula showsA.the kind of atoms in a molecule

B.how the atoms in a molecule are bonded together

C.the actual number of atoms in the moleculeD.the simplest ration of atoms in a molecule

16. The equation shows a substitution reaction on methane.

What is the molecular formula for X?

A. CCl4

B. CH3Cl

C. CH2Cl2

D. CHCl3

17. Which of the following are the best to increase the collision frequency?I. use smaller sizes of reactants

II. use higher concentration of reactants

III. use a higher temperature of reactants

IV. use a bigger size container

A. I and II only

B. I and IV onlyC. II and III only

D. I, II and III only

18. Which of the following statements about isomerism is correct?

A. Two or more compounds with the same molecular mass but different molecular formulae.

B. Two or more compounds with the same physical properties but different chemical properties

C. Two or more compounds with the same chemical properties but different molecular mass.

D. Two or more compounds with the same molecular formula but different structuralformula

19. An alkane is an organic compound whichI. Contains carbon and hydrogen atoms only

II. have single covalent bond only

III. exist as a gas at room temperatureIV. is soluble in water

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CH3Cl + Cl2 X + HCl



A. I only

B. I and II onlyC. II and III only

D. I and IV only

20. What is the name of the following compound?

A. 4-methylbut-2-ene

B. Butan-2-ene

C. 3-methylbut-1-eneD. 2,3-dimethylprop-1-ene

Section B :

Instructions : Answer all question in section B

1. Table 1 below shows the result collected from the reaction between an excess of

magnesium carbonate powder and 25 cm3 of 0.2 mol dm-3 dilute nitric acid

Time/min 0 1 2 3 4 5 6 7

Total volume of 0.00 12.00 20.50 29.5 38.00 45.0 55.00 55.00

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gas collected /cm3 0 0

Table 1

a). Draw a diagram to show the set-up of the apparatus. (2 marks)

b). i). Name the gas evolved.

_________________________________________________________________________ (1 mark)

ii). Give a test to identify the gas evolved.

__________________________________________________________________________ (1 mark)

c). Draw a graph of volume of gas against time. (3 marks)

d). Using the collision theory, explain the reaction is slower if magnesium carbonate pellets are

used.

___________________________________________________________________________

__________________________________________________________________________

_ (1 mark)

e). i). Calculate the maximum volume of gas that will be collected in this reaction.

(Molar volume of gas : 24dm

3

at room temperature)

(1 mark)ii). Explain why the volume of gas collected in the experiment is less than the actual

maximum volume.

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(1 mark)

a). Explain what are hydrocarbons?

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(1 mark)Table 2 shows the molecular formulae of the compounds A, B and C.

Compound Molecular formula

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A CH3CH2CH2CH3

B CH2CHCH2CH3

C CH3CH(CH3)CH3

Table 2

b). Based on the molecular formulae shown in table 1, state the homologous series of A, B and

C.

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(1 marks)

c). i). Which compounds are isomers?

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____ (1 mark)

ii). Explain your answer in c). (i).

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(1 mark)

d). Draw the possible formulae for compounds A and C.

(2 marks)e). What would you observe when compounds A and B are tested with bromine water?

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(1 mark)

f). Which compound, will produce more soot when lighted, A or B? Explain your answer.

(Relative atomic mass : C;12, O;16, H;1)

__________________________________________________________________________

____

__________________________________________________________________________

____

(2 marks)

g). Write the chemical equation for the combustion of compound A.

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__________________________________________________________________________

____ (1 marks)

Section C :Instructions : Answer all questions in section C

a). Explain

i). activation energy

ii). effective collisioniii). functional group

(6 marks)

b). Draw the structural formulae and give the names of isomers of butane.

(4 marks)

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GOOD LUCK

MARKING SCHEME OF ASSESSSMENT 1 (FORM 5 2007)

SECTION A: OBJECTIVE QUESTIONS.

SECTION B : STRUCTURE QUESTIONS.

1. a).

b). i). carbon dioxide (1)ii). The gas liberated is passed to the lime water in a test tube. The lime water turns cloudy.(1)

c).

1 A 11 C

2 B 12 D

3 B 13 C

4 C 14 B

5 D 15 B

6 A 16 C

7 A 17 D

8 D 18 D9 B 19 B

10 D 20 B

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Label – 1 mark

Apparatus – 1 mTotal - (2)



d). Magnesium carbonate in pallet has a small total surface area, so effective collision

frequency is decrease and the rate of reaction also decrease. (1)

e). i). 60 cm3 (1)

ii). Some carbon dioxide dissolved in water. (1)

a). Hydrocarbon are compounds containing only hydrogen and carbon atom only. (1)

b). A and C – alkanes, B-alkenes (1)

c). (i). A and C (1)(ii). Both have same the molecular formula but different in structural formula. (1)

d).

(2)

e). Compound B would decolorize bromine water. Compound A shows no changes. (1)

f). Compound B would produce more soot than compound A when lighted. (1)

Compound B an alkene has higher percentage of carbon per molecule than compound A as

an alkane (1)Total – (2 marks)

g). C4H10 + 13/2 O2 4CO2 + 5H2O (1)

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Label of axis X and Y -1 mark Smooth curve line – 1 mark

Correct scale - 1 mark

Total - 3 marks



SECTION C: ESSAY

1. a). (i). activation energy- is the minimum energy required by a reactant to start the reaction (2)(ii). Effective collision – is collision where the particles of reactant collide with each other in

the correct orientation to produce sufficient energy to overcome the activation energy.

Total - (2)(iii). functional group- is a special group of atom attached to an organic molecule which

determines the chemicals properties of the molecules. Total - (2)

b).

Structure - 2 marks + Name – 2 marks = Total – (4) marks

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assessment 1 form 5

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