Class: F - Baptist Lui Ming Choi Secondary Schoolchemistry/F3chemistry/internal exam... · Web...

Class: F.3____ ( ) Baptist Lui Ming Choi Secondary SchoolFinal Examination (2012-2013) Date: 19/ 06/ 2013

Name: _______________ Form 3 Chemistry Time: 08:40 - 09:50am

Answer ALL the questions.For Section A, choose the best option and write the correct answer on the multiple choice answer sheet. For other sections, write the correct answers on the answer sheets provided.Section A: Multiple Choice (30%)1. Benzene is a chemical which catches fire easily and causes cancer. Which of the following are

the correct hazard warning labels of benzene?(1) (2) (3) (4)

A. (1) and (2) only.B. (2) and (3) onlyC. (1) and (3) onlyD. (2) and (4) only

2. Which of the following combination of apparatus and label is correct?

A. B. C. D.

Separating funnel Flat-bottomed flask Measuring cylinder Crucible

3. Which of the following is a chemical change?A. Heating dry ice in air strongly.B. Adding sodium chloride in boiling water.C. Mixing copper oxide and carbon together.D. Bubbling carbon dioxide into limewater.

4. Which of the following methods can be used to remove carbon dioxide and water vapour from the air?A. Cooling to -80oC and then filtrationB. Repeating cooling and compression to -200oCC. Filtration and then cooling to -80oCD. Bubbling air into limewater

P.T.O.

Form 3 Chemistry P. 2

5. Which of the following gases can be used to fill food package?A. NitrogenB. Hydrogen sulphideC. Carbon dioxideD. Hydrogen

6. Which of the following is/ are the physical properties of alcohol?(1) its boiling point is lower than that of water.(2) it is flammable.(3) it is a colourless liquid at room temperature.

A. (1) and (2) only.B. (1) and (3) only.C. (2) and (3) only.D. (1), (2) and (3).

7. Which of the following method cannot be used as desalination of seawater?A. DistillationB. Reverse osmosisC. Ion exchangeD. Electrolysis

8. Which of the following is the main use of sodium chloride?A. making plasticB. making glassC. preserving foodD. making limewater

9. Which of the following statements about seawater are correct?(1) It is a mixture of different substances.(2) All dissolved substances in seawater are salts.(3) Salt can be obtained by evaporation of seawater.

A. (1) and (2) only.B. (1) and (3) only.C. (2) and (3) only.D. (1), (2) and (3).

To be continued


Questions 10 to 11 refer to the following diagrams, which show the arrangements of particles in six substances:

10. The one that are mixtures areA. P and QB. Q and SC. P and TD. S and T

11. The one represents carbon dioxide gas molecule (CO2) isA. QB. SC. T D. U

12. Which of the following combinations is correct?Ore Major compound in the ore

A. Bauxite Aluminium oxideB. Haematite Sodium chlorideC. Iron pyrite Iron oxideD. Malachite Calcium carbonate

13. What are the constituent elements of calcite?A. Calcium and oxygenB. Calcium, carbon and oxygenC. Calcium, hydrogen and oxygenD. Calcium and carbon

P.T.O.

Form 3 Chemistry P.4

14. Which of the following acid is usually used to test the presence of chloride ions in a solid sample?A. dilute hydrochloric acid.B. dilute nitric acid.C. concentrated sulphuric acid.D. concentrated hydrochloric acid.

15. Which of the following are examples of chemical weathering?(1) Granite is broken down into piece by temperature change. (2) Chalk is dissolved by acidic rainwater.(3) Iron-containing minerals is attacked by oxygen in air.

A. (1) and (2) onlyB. (1) and (3) onlyC. (2) and (3) onlyD. (1), (2) and (3)

16. Which of the following about erosion of rock is correct?A. It is the slow process in which exposed rocks are broken down into smaller pieces.B. It is the slow process in which exposed rocks are cracked by frost action.C. It is the slow process in which weathered rocks are transported away by water.D. It is the slow process in which weathered rocks are attacked by oxygen.

17. Which of the following substances is a metal?A. oxygenB. beryllium C. bromineD. neon

18. Which of the following atoms can form simple cations?(1) potassium(2) oxygen(3) sulphur(4) magnesium

A. (1) and (2) onlyB. (2) and (3) onlyC. (2) and (4) onlyD. (1) and (4) only

To be continued


19. The electronic arrangement of an anion X3- is 2,8,8. The number of neutrons in X is 16. The mass number of X is A. 34B. 33C. 32D. 31

20. The chemical formula of a compound is CaAl2Si2O8. What are the elements present in this compound?A. Carbon, argon, silicon and oxygenB. Calcium, aluminium, sulphur and oxygenC. Calcium, alumnium, silicon and oxygenD. Carbon, argon, sulphur and oxygen.

21. Gallium exists in two isotopic forms, 69Ga and 71Ga, with percentage abundance of 60.1%, and 39.9% respectively. The relative atomic mass of gallium is…A. 69.6B. 69.8C. 70.0D. 70.2

22. Which of the following diagrams represents chlorine gas? (Circles in different size represent atoms of different elements.)

A. B. C. D.

23. Calcium and bromine are arranged in the same period becauseA. they can react to form an ionic compound, calcium bromide, CaBr2.B. both are reactive.C. their atoms have the same number of electrons in their second electron shell.D. their atoms have the same number occupied of electron shells.

P.T.O.


24. Non-metal elements X and Y are in the same group of the Periodic Table. Element X has a greater atomic number. Which of the following statements are correct?

(1) Size of atom X is greater than that of atom Y.(2) X is less reactive than Y.(3) X and Y have different physical properties.


25. Which of the following pairs of elements are members of the same group of the periodic table?A. X6

12 and Y1632

B. A49 and B12

24

C. Z37 and W8

16

D. Q510 and R17

35

26. Which of the following statements about group VII elements is correct?A. All of them are good conductors of electricity.B. They have the same number of occupied electron shells.C. Their reactivity decrease down the group.D. They are all in gaseous state at room temperature and pressure.

27. Which of the following statements concerning helium is/ are correct?(1) The outermost electron shell of a helium atom has two electrons.(2) Helium is used to fill balloons.(3) Helium exists in the form of diatomic molecule.


28. In which of the following particles are isoelectronic to a neon atom?(1) Al3+ (2) O2– (3). Be2+


To be continued


29. The atomic numbers of element A and B are 19 and 8 respectively. The formula of the compound formed between A and B is likely to be…A. AB3

B. A3BC. AB2

D. A2B

30. Which of the following elements are arranged in an increasing order of melting point?A. Iodine, bromine and chlorineB. Sulphur, hydrogen and iron C. Oxygen, mercury and carbonD. Gold, silver and platinum

Section B: Matching (5%)In the boxes provided, write the letters in column II that match with the numbers in column I.

Column I Column II1. Atmosphere A. A member of group 0 elements2. Blue copper(II) sulphate B. A mixture of oxygen and nitrogen3. Physical weathering C. Attack of acid and oxygen on rocks4. Carbon-12 D. Action of temperature and frost on rocks5. Helium E. Turns white upon heating

F. To test water vapour in the airG. A reference standard of relative atomic massH. A gaseous layer surrounding the Earth

Section C: Fill in the blanks (15%)1. The chemical formula and hazard warning label are displayed on a bottle of concentrated nitric

acid,

It means concentrated nitric acid is __(a)__ and it is a compound, which is formed from hydrogen, __(b)__ and oxygen.

2. The method of separating the gases from liquid air is called __(c)__. The air is first __(d)__ by repeated cooling and compression.

3. Pure common salt can be extracted from seawater by __(e)__ and then __(f)__.

P.T.O.Form 3 Chemistry P. 8

4. Limestone is an example of __(g)__ rock and it is mainly made up of the __(h)__: calcite.5. An atom has an extremely small centre called __(i)__ where the protons and __(j)__ can be

found.6. Group VII elements are also known as __(k)__. The most poisonous group VII element is

__(l)__.7. Positively charged ions are called __(m)__. Negatively charged ions are called __(n)__.

__(o)__ is the strong non-directional electrostatic force of attraction between oppositely charged ions.

Section D: Structural Questions (50%)1.a. In an experiment to determine the percentage of oxygen in an air sample, the sample air is

passed back and forth over hot copper turnings for many times. As the volume of sample air is decreasing, copper turning is being turned black. Copper reacts with oxygen to form copper oxide. The set-up and results are as follows:

The volume of the air sample in the syringe before heating = 80 cm3 Final volume of the “air” left in the syringes after heating and then cooling = 65 cm3

i. The “air” is cooled down before measuring final volume. Why?ii. What is the purpose of heating the copper turnings strongly?iii. Calculate the percentage by volume of oxygen in the sample.

(Show your step and give answer in 3 sig. fig.)iv. The percentage of oxygen found in the sample is less than that of an ordinary air. Suggest

ONE possible explanation for the difference.(5 marks)

b. Complete the following word equations:

i. Lead sulphide + oxygen h⃗eat lead oxide + __________ii. Copper oxide + carbon h⃗eat ________ + ________

iii. _______ e⃗lectricity

Aluminium + oxygen

iv. Calcium oxide + water _______(5 marks) To be continued


heat

Copper turnings

Air sample

2.a. When seawater (or concentrated sodium chloride solution) is electrolysed, two gases are

produced. This diagram shows the apparatus used to electrolyse seawater.

i. Give the name of the gas Y. ii. What is the colour of the gas Y? iii. What is the smell of the Y like? iv. State the simple chemical test and the observation for gas Y.

(5 marks)b. Study the diagram about rock cycle given below:

i. Process A refers to break down of rock. Name the process A.ii. Given that D is metamorphic rock. What are the conditions that change C into D?iii. 1. What is the type of rock E?

2. Give an example of rock E.3. State ONE of its uses.

(5 marks) P.T.O.Form 3 Chemistry P. 10

Gas YColourless gas X

electrodeSeawater

3.a. A student draws the structure of an atom in this way:

Assumed that the number of protons in the atom is correct.i. What mistake has the student made in the drawing?ii. Draw the correct electron diagram of the above atom.iii. To which group of the periodic table could this atom belong? Explain your answer.iv. Write the full atomic symbol (notation with symbol, atomic number and mass number) of

the atom.v. The above atom can be converted into an anion, draw the electron diagram of the anion.

(6 marks)b. i. What is meant by the term “isotopes”?

ii. It was found that boron is made up of two isotopes, boron-10, 10B and boron-11, 11B only. Given that the percentage abundance of boron-10 is 19.9%. Calculate the relative atomic mass of boron (show your steps and give answer in 3 sig. fig.).

(4 marks)4.

a. Semi-metals are elements intermediate in properties between metals and non-metals.i. Name a group IV semi-metal.ii. What is the period number of this element? Explain your answer.

(3 marks)b. Group I elements are reactive metals. Rubidium (atomic number = 37) is the fourth member of

group I metals. i. Given that the electron arrangement of rubidium is 2, 8, 18, x, y.

What are the values of x and y?ii. Suggest ONE physical property of rubidium. iii. Suggest a method to store rubidium.

(3 marks)c. Both sodium and rubidium undergo reaction with water.

i. Which element, sodium or rubidium is more reactive? Explain your answer.ii. State TWO observable changes if sodium is added into water.iii. Complete word equation for the reaction between sodium and water.

sodium + water sodium hydroxide + __________(4 marks) To be continued


5.a. Give the formula of the following compounds:

i. Potassium carbonateii. Iron(III) hydroxide

(Given that the formulae of iron(III) ion, hydroxide ion and carbonate ion are Fe3+, OH-

and CO32- respectively.)

(2 marks)b. Give the chemical name of the following compounds:

i. Na2Sii. AlCl3

(2 marks)

c. Draw the electron diagrams (show outermost shell electrons only) of the compounds formed from the following elements: i. Magnesium and fluorineii. Lithium and oxygen

(2 marks)

d. John is given a solid sample of malachite which is mainly made up of copper(II) carbonate. He thinks that malachite decompose upon heating to produce carbon dioxide gas.i. Draw a labeled diagram of an experiment to generate and test for carbon dioxide gas

produced by heating malachite in a school laboratory.ii. Write an expected observable change of the experiment.

(4 marks)***End of Paper***

Class: F.3____ ( ) Baptist Lui Ming Choi Secondary School Score: ________/100Final Term Examination (2012-2013) Date: 19/ 06/ 2013

Name:______________ Form 3 Chemistry Time: 08:40 - 09:50

Section A: Multiple Choice (30%)Mark the correct answer on the multiple choice answer sheet provided.Section B: Matching (5%)Column I 1 2 3 4 5Column II

Section C: Fill in the blanks (15%)1. a. __________________________ b. __________________________

2. c. __________________________ d. __________________________

3. e. __________________________ f. __________________________

4. g. __________________________ h. __________________________

5. i. __________________________ j. __________________________

6. k. __________________________ l. __________________________

7. m. __________________________ n. __________________________

o. __________________________

Section D: Structural Questions (50%)

1. a. i. __________________________________________________________________

__________________________________________________________________(1%)

ii. __________________________________________________________________

__________________________________________________________________(1%)

iii.

(2%)

iv. __________________________________________________________________

__________________________________________________________________(1%)


1. b. i. Lead sulphide + oxygen h⃗eat lead oxide + _______________ (1%)

ii. Copper oxide + carbon h⃗eat _____________ + _____________ (2%)

iii. _______________ e⃗lectricity aluminium + oxygen (1%)

iv. Calcium oxide + water _______________ (1%)

2. a. i. __________________________________________________________________(1%)

ii. __________________________________________________________________(1%)

iii. __________________________________________________________________(1%)

iv. __________________________________________________________________

__________________________________________________________________(2%)

b. i. __________________________________________________________________(1%)

ii. __________________________________________________________________(1%)

iii. 1. _______________________________________________________________(1%)

2. _______________________________________________________________(1%)

3. _______________________________________________________________(1%)

3. a. i. __________________________________________________________________(1%)

ii.

(1%)iii. __________________________________________________________________

__________________________________________________________________(2%)

iv. __________________________________________________________________(1%)

v.

(1%)To Be Continued


3. b. i. __________________________________________________________________

__________________________________________________________________(2%)

ii.

(2%)

4. a. i. __________________________________________________________________(1%)

ii. __________________________________________________________________

__________________________________________________________________(2%)

b. i. __________________________________________________________________(1%)

ii. __________________________________________________________________(1%)

iii. __________________________________________________________________(1%)

c. i. __________________________________________________________________

__________________________________________________________________(1%)

ii. __________________________________________________________________

__________________________________________________________________(2%)

iii. sodium + water sodium hydroxide + _______________ (1%)

5. a. i. __________________________________________________________________(1%)

ii. __________________________________________________________________(1%)

b. i. __________________________________________________________________(1%)

ii. __________________________________________________________________(1%)

c. i.

(1%)ii.

(1%) P.T.O.Form 3 Chemistry P. 4

5. d. i.

(3%)ii. __________________________________________________________________

__________________________________________________________________(1%)

***End of Paper***

Class: F.3____ ( ) Baptist Lui Ming Choi Secondary SchoolFinal Examination (2012-2013)

Name: _____________ Form 3 Chemistry Score: ________/100

Section A: Multiple Choice (30%)1. A C D A A 6. B D C B C11. B A B B C 16. C B D D C21. B A D D B 26. C A A D C

Section B: Matching (5%)Column I 1 2 3 4 5Column II H E D G A

Section C: Fill in the blanks (15%)1. a. Oxidizing b. Nitrogen

2. c. Fractional distillation d. Liquefied

3. e. Filtration f. Crystallization

4. g. Sedimentary h. Mineral

5. i. Nucleus j. Neutron(s)

6. k. Halogen(s) l. Fluorine

7. m. Cation(s) n. Anion(s)

o. Ionic bond

Section D: Structural Questions (50%)

1. a. i. It is because hot air expands (or cool air contracts). [1]

ii. To speed up the reaction between copper and oxygen. [1]

iii. [(80-65)/ 80] x 100% = 18.8% [1M+1A]

iv. The reaction between copper and oxygen is not yet complete/ the sample is not

unbreathed air/ the final volume was measured when the air was not yet cooled

down/…(any reasonable answer) [1]


1. b. i. Lead sulphide + oxygen h⃗eat lead oxide + sulphur dioxide [1]

ii. Copper oxide + carbon h⃗eat copper + carbon dioxide [1+1]

iii. Aluminium oxide e⃗lectricity Aluminium + oxygen [1]

iv. Calcium oxide + water calcium hydroxide [1]

2. a. i. Chlorine [1]

ii. Greenish yellow/ green/ yellow [1]

iii. It smells like bleaching solution. [1]

iv. It turns moist blue litmus paper [1] red and then white [1]

b. i. Weathering [1]

ii. High temperature and pressure [1]

iii. 1. Igneous rock [1]

2. Granite [1]

3. It is used as a building material [1]

3. a. i. The number of electron is incorrect. [1]

ii.

Electron diagram of nitrogen atom. [1]iii. Group V [1]. Because the number of outermost shell electron is equal to five. [1]

iv. N715 [1]

v.

Electron diagram of nitride ion, N3- [1]

To Be ContinuedForm 3 Chemistry P. 3

3. b. i. Isotopes are atoms of a particular element that have the same number of protons

(atomic number) but different number of neutrons (mass number). [1+1]

ii. 10 x 19.9% + 11 x 80.1% = 10.8// [1M+1A]

4. a. i. Silicon [1]

ii. Period number is 3 [1]. Because there are three occupied electron shells in a silicon

atom. [1]

b. i. x = 8 and y = 1 [1]

ii. It is a shiny solid/ good conductor of heat (or electricity)/ malleable/ ductile/…(any one

physical property of metal) [1]

iii. It is kept under oil [1].

c. i. Rubidium. Because reactivity of group I elements increases down the group. [1]

ii. Sodium floats and moves over water/ it forms a silvery ball/ it gives a hissy sound/ it

burns with a golden yellow flame. (any TWO) [1+1]

iii. sodium + water sodium hydroxide + hydrogen [1]

5. a. i. K2CO3 [1]

ii. Fe(OH)3 [1]

b. i. Sodium sulphide [1]

ii. Aluminium chloride [1]

c. i. Electron diagram of MgF2 [1]


5. c. ii. Electron diagram of Li2O [1]

d. i. Heating malachite (or copper carbonate) in a test tube (or boiling tube) [1]Bubbling carbon dioxide gas into a test tube of limewater [1]Labels any TWO [1/2 + 1/2]

ii. Malachite turns from green to black/ Limewater turns from colorless to milky. [1]

***End of Paper***

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