Mid Year Chem F4 2011

8/6/2019 Mid Year Chem F4 2011

http://slidepdf.com/reader/full/mid-year-chem-f4-2011 1/6

1

SULIT 4541

20112½ Jam

SMJK NAN HWA

SITIAWAN

PEPERIKSAAN PERTENGAHAN TAHUN 2011

CHEMISTRY

FORM 4

2 HOUR 30 MINUTES

INFORMATION FOR CANDIDATES

1. This question paper consists of 20 of objective questions, 6 of structured questions and 1 essay.

2. Answer all questions.

3. The diagrams in the questions are not drawn to scale unless stated.

4. You may use a non-programmable scientific calculator.

4541 @2011 SULIT



2

SULIT 4541

SECTION A : OBJECTIVE QUESTIONS

1. Which of the following substances exists as atoms?

A Carbon B OxygenC Water D Chlorine

2. Diagram 1 shows the heating curve of solid naphthalene. Which of the following statements is true about

the particles of naphthalene at To

C?

Diagram 1

I The particles can only vibrate and rotate at fixed positions at t1

II Both solid and liquid are present between t1and t

2

III The forces of attraction between particles are overcomeIV The particles absorb heat energy

A I and III only B II and IV onlyC I, II and III only D I, II, III and IV

3. Diagram 2 shows four elements in the Periodic Table of Elements. Which of the element can form colouredcompound?

Diagram 2

4. Potassium and sodium are in the same group in the Periodic Table. Which of the following statements istrue about potassium?

A Potassium reacts more vigorously with water compared to sodiumB Potassium has a lower density compared to sodiumC The melting point of potassium is higher than that of sodiumD Potassium is less electropositive than sodium

4541 @2011 SULIT



3

SULIT 4541

5. 1.72 g of an oxide of metal X contains 0.8 g oxygen. What is the empirical formula of the oxide? [Relativeatomic mass : X = 46 ; O = 16]A XO

2B X

2O

C X2O

3D X

2O

5

6. Which of the following statement is not true for one mole of a substance?

A 1 mole of copper contains 6.02 x 1023

atomsB 1 mole of oxygen gas contains 6.02 x 10

23molecules

C 1 mole of water contains the same number of atoms as in 12 g of carbon-12D 1 mole of carbon dioxide contains the same number of molecules as the number of

atoms in 12g of carbon-12

7.

Based on the information given above, what is the nucleon number of atom Q ?

A 35

B 33C 31

D 30

8. Diagram 3 shows the symbol of an element J .

Diagram 3

The position of element J in the Periodic Table isPeriod Group

A 2 17B 3 17C 2 1

D 3 1

9. The learning of chemistry is important in our daily lives because

I we can adopt safety measures in handling chemicals

II we can predict the rate of a chemical reaction

III we can learn about our body functions

IV we can understand the importance of recycling

A I, II and III only B I, II and IV only

C I, III and IV only D I, II, III and IV

4541 @2011 SULIT

Atom Q

Electron arrangement = 2.8.5

Number of neutrons = 16

19

9



4

SULIT 4541

10. Diagram 4 shows the arrangement of electrons for ion produced from atom Q.

Diagram 4

Which of the following statement is true about Q ?

A Atom Q is located in Group 1 of the Periodic TableB Atom Q has 7 electrons in its valence shellC Atom Q is an inert gasD Atom Q has achieved the octet electron arrangement

11. Diagram 5 shows a model of an atom.

Which scientist proposed this model of an atom?

A Neils Bohr B J.J Thompson

C James Chadwick D Rutherford

12. The equation below shows the reaction between magnesium and sulphuric acid.

Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g)

Which of the following statements is true? [Relative atomic mass of H = 1; Mg = 24; S = 32; O = 16]

A 1 g magnesium reacts completely with 1 g sulphuric acid.

B 1 mol magnesium reacts completely with 1 mol hydrogen ions.

C 24 g magnesium reacts completely with 98 g sulphuric acid.

D 2 mol hydrogen gas are produced when one mol sulphuric acid reacts completely with excessmagnesium.

4541 @2011 SULIT

X

X

X

X

X

X

X

X

X

X

Nucleus

Electrons

Diagram 5



5

SULIT 4541

13. Diagram 6 shows the set up of apparatus to determine the empirical formula of copper(II) oxide.

Diagram 6

Which of the following are mistakes shown in the setup of the apparatus in this experiment?I No Bunsen burnerII the stopper wrongly fixedIII the position of the thistle funnelIV the position of the combustion tube

A I, II and III only B I, III and IV onlyC II and IV only D I and III only

14. The molecular formula of ammonium sulphate is (NH4)2SO4 and it is widely used as fertiliser . Given therelative atomic mass of H=1; N=14; O=16 and S=32, what is the percentage of nitrogen in ammoniumsulphate?

A 20.1% B 21.2%C 22.3% D 23.4%

15. What is the number of atoms in 3.68g of ethanol, C2H5OH?[ relative atomic mass of H=1; C=12, O=16; Avogadro constant = 6 x 10

23mol

–1]

A 4.8 x 1022

B 2.2 x 1023

C 6.0 x 1023

D 2.4 x 1024

16. Astatine, At is an element below chlorine of the same group in the periodic table. Determine the molecularformula of its product and the reactivity of astatine with iron compared to the reaction chlorine with iron.

Formula of product Reactivity

A FeAt2 Less

B FeAt2 More

C FeAt3 LessD FeAt3 More

4541 @2011 SULIT

Thistle funnel Oxide of copper

Deliver tube Combustion tube

Dilute sulphuric acid

Zinc



6

SULIT 4541

17. Which of the following steps should be taken when carrying out an experiment?I Gathering data and informationII Analysing dataIII Making a conclusionIV Interpreting data

A I and II onlyB III and IV onlyC I, II and III onlyD I, II, III and IV

18. Which of the following radioisotopes is used to detect leaks in underground petroleum piping?A Carbon-14 B Sodium-24C Phosphorus-32 D Cobalt-60

19. Table 1 shows the proton number of elements P, Q and R.Which of the following statements is true?

A The electronegativity decreases in the order P, Q, RB P, Q and R are good conductors of electricityC All the elements exist as diatomic moleculesD The atomic radius decreases in the order P, Q, R.

20. Helium is chemically inert element. Which of the following explains this statement?A Helium is an element in Group 16B Helium reacts with any other elementC Helium has two shells occupied with electrons.D Helium has a duplet electron arrangement in its shell

Answer For SECTION A

1 6 11 16

2 7 12 17

3 8 13 18

4 9 14 19

5 10 15 20

4541 @2011 SULIT

Element P Q R

Proton Number 11 13 17Table 1

Mid Year Chem F4 2011

Documents

Transcript of Mid Year Chem F4 2011