uk1 chemistry paper

8/7/2019 Uk1 Chemistry Paper

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SMK Simpang RengamCurriculum Test 1,2011

Chemistry Form Four ( 1 Hour )

Name : Form : 4..Answer all questions

1. Which of the following occupations does not involve the knowledge of chemistry?A. Geologist C. ClerkB. Food tecnologist D. Pharmacist

2. The branch of chemistry that studies how plastics are formed isA. Organic chemistry.B. Inorganic chemistry.

C. Industrial chemistry.D. Polymer chemistry.

3. Making inference meansA. The initial conclusion is made based on the observation at the beginning of the investigation.B. The initial conclusion is made based on the observation at the ending of the investigationsC. The initial observation is made based on the conclusion at the beginning of the investigationD. The initial observation is made based on the conclusion at the ending of the investigation

4. A hypothesis is a statement to show the relationship between two variables. What are those twovariables?A. The fixed and responding variableB. The fixed and manipulated variable

C. The manipulated and responding variableD. The manipulated and fixed variable

5. An inflated balloon will shrink when placed in a freezer. This is because at lower temperature,the air particlesA move slower and come closer together.B move slower and further apart.

C move faster and come closer together.D move faster and further apart.

1. Electron move in shells around the nucleus in an atom. Which of the following scientist proposedthe above theory ?A. Neil Bohr.B. John Dalton.

C. Ernest Rutherford.D. J.J Thomson.

2. Which of the following atoms has the most number of neutrons?A. B. C. D.

8. The atomic symbol of element Y is given below

What is the electron arrangement for the atom of element Y ?A. 2.6 B. 2.8 C. 2.8.6 D. 2.8.8.6

9. Which of the following is the common characteristic for isotopes of an element?A Physical propertiesB Chemical properties

C Nucleon numberD Number of neutrons

1

23

11Na

24

12Mg

27

13Al

20

10Ne

16

8 Y


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10. What is the relative formula mass of ammonium carbonate, (NH4)2CO3?[Relative atomic mass : N, 14; H, 1; C, 12; O, 16]A. 78B. 96

C. 86D. 98

11. A compound with formula Y2CO3 has a relative formula mass 0f 140. What is the relative atomic

mass of Y? [ Relative atomic mass : C,12 ; O,16 ]A 40B. 70

C. 60D. 90

12. The figure shows the arrangement of particles of a substance that undergoes the changeof state through process X

What is process XA. Melting.B. Boiling.

C. Freezing.D. Sublimation

13. The mass of an atom of element Y is ten times greater than the mass of an atom of Beryllium, Be.What is the relative atomic mass of Y ?[Relative atomic mass : Be,9]

A. 9B. 19

C. 90D. 900

14. Table 3 shows two elements and their respective relative atomic mass.

Element Relative atomic massX 32Y 16

Which of the following is true about the atoms of element X and Y?A. The mass of 1 mol of X is twice the mass of 1 mol of YB. 1 mol of X has the same mass as 1 mol of YC. The mass of an atom of X is 32 g and the mass of an atom Y is 16 gD. The number of mole in 16 g of atom X is equal to the number of mole in 16 g of atom Y

15. Which of these gases occupies the largest volume at STP ?[Relative atomic mass : H, 1; N,14; O,16; S,32; volume of 1 mol of gas at STP is 22.4 dm3]A. 3.2g of oxygen gas,O2B. 3.4 g of ammonia gas,NH3C. 4.0 g of hydrogen gas,H2D. 9.6 g of Sulphur Dioxide gas, SO2

Answer1 4 7 10 13

2 5 8 11 143 6 9 12 15

2

X


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Section B1. Diagram 1.1 shows the symbols for atoms of elements X, Y and Z.

(a) (i) Write the electron arrangement of atom Z.

.(1mark)(ii) What is the number of neutrons for atom Y?. (1mark)(iii) What is the relative atomic mass of atom X?.(1mark)(iv) State the number of electrons in an atom of W ?..(1mark)(v) Draw a diagram to show the arrangement of electrons around the nucleus atom of Y ?

(1mark)

(vi) What is the number of valence electrons in an atom of Y..(1mark)(vii) State a pair of isotopes form the particles in Diagram 1.1.(1mark)(viii) State the reason for your answer in (d)(i)..(1mark)

(b) Diagram 1.2 shows the set up of the apparatus of an experiment where a drop of bromine liquid isdropped into a gas jar and is left for a few minutes.

(i) State one observation in the gas jar after a few minutes.

.(1mark)

(ii) Name the process that occurred in the gas jar..(1mark)(iii) Name the type of particles that exist in bromine..(1mark)(iv) State the change of state of bromine that occurred in the gas jar.

.(1mark)(v) The change of state in (b) (iv) can occur at room temperature. Explain why

.(1mark)(c) Substance X has a melting point of 790C and boiling point of 1450C . Draw the particles

arrangement of substance X at 800C.

(1mark)3

12

6 X28

14 Y19

9 Z14

6W


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(c) Sketch the graph of temperature against time for substance X when it is heated from roomtemperature until it reaches a temperature of 100 oC

(2marks)2. Calculate the relative molecular mass/ relative formula mass for the compound in the table below

a. Ammonia, NH3 b. Zinc Sulphate, ZnSO4

(1mark) (1mark)

c. Hydrated Copper(II) sulphate, Cu SO4.5 H2O d. Glucose, C6H12O6

(1mark) (1mark)

3. How many moles are 8.8 g of CO2gas?

(1mark)4. How many grams are 0.015 moles of Cl2gas?

(1mark)5. How many molecules are there in 0.025 mole of CH4?

(1mark)6. Calculate the mass of the 16.8 dm3 of carbon monoxide gas, CO at standard temperature and pressure:

(2marks)Related information :[proton number of Cl : 17, Zn : 30, Cu : 29, O : 8, Na : 11, N : 7, C : 6, H: 1, S : 16][nucleon number or relative atomic mass of Cl : 35.5, Zn : 65, Cu : 64, O : 16, Na : 23, N :14, C : 12, H: 1, S: 32][1 mol of substance contain 6.02 x 1023 particle, volume of 1 mol of gas at STP is 22.4dm3, volume of 1 mol gas at room temperature and pressure is 24 dm 3]

Prepared by, Certified by,

.. (Sensrazazli B Baharim) (Pn Chua Hwee Kian)

4


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ANSWER

1. C2. D3. B

4. C5. A6. A

7. C8. A9. B

10.B11.A12.D

13.C14.A15.C

15M

SECTION B

1 I . 2.7 1M

II. 14 1MIII. 12 1MIV. 6 1MV. .

1M

VI. 4 1MVII. W and X 1M

VIII. Element with the same number of proton different in the nucleon number/number ofneutron. 1M

(b) I. bromine gas/vapour spread to the upper gas jar 1M

II. Diffusion 1MIII. Molecule 1MIV. Liquid to gas 1MV. Bromine has low boiling point 1M

(c)

1M

(d) Temperature ,0C

Time, s 2M

2. a. 17 1M

b. 161 1Mc. 250 1Md. 180 1M

3. 8.8 / 44= 0.2 mol 1M

4. 0.015 X 71 = 1.065 g 1M

5. 0.025 X NA = 1.505 x 1022

molecule 1M

6. mol = 16.8/22.4 = 0.75 mol 1M

Mass = 0.75 X 28 = 21 g 1MTOTAL = 40 X 2.5 =100

uk1 chemistry paper

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