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Chemistry
KG -
Professional Development
spm past year chemistry paper 1 (2010)
50 questions
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- 1. Multiple Choice
What is the meaning of isotopes?
Atoms of the same element with the same nucleon number
Atoms of the same elements with different number of neutrons
Atoms of different elements with different proton numbers
Atoms of different elements with the same nucleon number
- 2. Multiple Choice
The proton number of atom R is 14 and its relative atomic mass is 28. Which statement is correct?
Mass of 1 atom of R is 28 g
Molar mass of R is 28g mol-1
14 g of R contains 6.0 X 1023 atoms
Atom R has 14 protons, 14 electrons and 28 neutrons
- 3. Multiple Choice
What are the reactants in this equation?
Cu(OH)2 + 2HNO3 → Cu(NO3)2 + 2H2O
Copper(II) nitrate and water
Copper(II) nitrate and nitric acid
Copper(II) hydroxide and nitric acid
Copper(II) hydroxide and copper(II) nitrate
- 4. Multiple Choice
Element M and element L are located in Group 1 and Group 17 respectively. Element M react with element L to form a compund.
ML
ML2
M2L
M2L3
- 5. Multiple Choice
Element J and element Q have proton number of 12 and 9 respectively.
What is the relative formula mass(RAM) of a compound formed between J and Q?
(RAM: J=24; Q=19)
30
43
62
17
- 6. Multiple Choice
An oxide of element X has the empirical formula of X2O. 2.24 g of element X reacts completely with 0.96 g of oxygen. What is the relative atomic mass(RAM) of X?
(RAM: O=16)
112
56
25
17
- 7. Multiple Choice
Equation: 2H2O2 →> 2H2o + O2
What is the volume of O2 produced from the decomposition of 500cm3 of 2 mol dm-3 hydrogen peroxide at standard temperature and pressure(STP)?
(Molar volume of gas at STP = 22.4 dm-3 mol-1 )
11.2 dm3
22.4 dm3
33.6 dm3
44.8 dm3
- 8. Multiple Choice
Metal X has the following properties.
-Less reactive than iron
-Does not react with iron(II) oxide
Which metal oxide can react with X?
Zinc oxide
Magnesium oxide
Copper(II) oxide
Aluminium oxide
- 9. Multiple Choice
Which statement explains why the reactivity of Group 1 elements when going down the group?
The physical state of the elements changes from gas to liquid then to solid at room temperature
The attractive force between valence electron and the nucleus becomes stronger
The valence electron gets further away from the nucleus
The melting points of the elements decrease
- 10. Multiple Choice
Some transition elements and their compounds are useful catalysts in industry. Which pair is correct?
Iron (Manufacture of nitric acid from ammonia)
Nickel (Manufacture of ammonia)
Manganese(IV) oxide (Manufacture of margarine)
Vanadium(V) oxide (Manufacture of sulphuric acid)
- 11. Multiple Choice
How does a catalyst increase the rate of reaction?
Increase the number of effective collisions
Increase the activation energy of the reaction
Increase the total number of reactant particles
Increase the kinetic energy of reactant particles
- 12. Multiple Choice
Solid X is heated in a boiling tube and the temperature is recorded at regular time intervals. If the melting point of X is 78 oC, which graph represents the heating curve of curve X?
- 13. Multiple Choice
Diagram below shows an air ballon filled with gas X.
In which group is X located in the Periodic Table?
Group 15
Group 16
Group 17
Group 18
- 14. Multiple Choice
Table above shows the properties of oxides of elements P,Q and R and located in the same period in the Period Table. Arrange the three elements based on the increasing of proton number.
R,Q,P
R,P,Q
Q,P,R
Q,R,P
- 15. Multiple Choice
The electron arrangement of atom U is 2.8.1 and atom V is atom 2.8.7. What is the molar mass of a compound formed when atom U combine with atom V?
(RAM: U=23; V=35.5)
152.5 g mol-1
94.0 g mol-1
81.5 g mol-1
58.5 g mol-1
- 16. Multiple Choice
Which substances is a covalent compound?
Phosphorus(V) oxide
Sodium sulphate
Magnesium chloride
Lead (II) bromide
- 17. Multiple Choice
Which diagram shows the electron arrangement for the nitrogen molecule, N2 ?
- 18. Multiple Choice
Compound X has the following properties.
-Insoluble in water
-Has a boiling point of -89 oC
What is compund X?
Ethane
Ethanol
Ethanoic acid
Ethyl etanoate
- 19. Multiple Choice
Table above shows the electron arrangements of atoms P,Q,R and S. Which pair of atoms forms a compound by sharing electron?
P and S
P and R
Q and S
Q and R
- 20. Multiple Choice
Table above shows information about three voltaic cells. Metals X,Y and Z are used as electrodes in the cell.
What is the order of the metals from the most electropositive to the least electropositive?
X,Y,Z
X,Z,Y
Y,Z,X
Z,X,Y
- 21. Multiple Choice
What is the voltmeter reading when Pand Q are the pair of metals used as electrodes?
0.1 V
0.5 V
1.7 V
2.3 V
- 22. Multiple Choice
Which electrolyte and electrodes can be used to purify copper
- 23. Multiple Choice
0.1 mol dm-3 of solution X has a pH value of 13. Which statement is correct about the solution?
X is a weak acid
X is a strong akali
X dissociates partially in water
X has a high concentration of hydrogen ions
- 24. Multiple Choice
Which of the following is not a chemical property of acids?
Reacts with carbonate to produce salt, water and carbon dioxide
Reacts with reactive metal to produce salt and hydrogen
Reacts with metal oxide to produce salt and water
Reacts with alkali to produce salt and hydrogen
- 25. Multiple Choice
A farmer found that his soil is too acidic for some plants to grow well. Which substance is suitable to reduce the acidity of the soil?
Barium chloride
Calcium oxide
Sodium nitrite
Potassium iodide
- 26. Multiple Choice
The following equation represents the neutralisation between barium hydroxide, Ba(OH)2 and hydrochloric acid, HCl.
Ba(OH)2 + 2HCl → BaCl2 + 2H2O
What is the volume of 0.5mol dm-3 hydrochloric acid needed to neutralise 25cm3 of 0.1mol dm-3 barium hydroxide?
2.5 cm3
5.0 cm3
10.0 cm3
12.5 cm3
- 27. Multiple Choice
Which equations represents a double decomposition reactions to form a precipitate?
(I) CuSO4 + Na2CO2 → CuCO3 + Na2SO4
(II) CuSO4 + Mg(NO3)2 → Cu(NO3)2 + MgSO4
(III) AgNO3 + NaCl → AgCl + NaNO3
(IV) ZnCl2 + Na2SO4 → ZnSO4 + 2NaCl
I and II
I and III
II and IV
III and IV
- 28. Multiple Choice
When the temperature of a reacting mixture increases, the rate of reaction increases. Which statement explains why the rate of reaction increases?
The total surface area of reactant particles increases
The total number of reactant particles per unit volume increases
The reactant particles move faster and collide more often with one another
The reactant particles which collide more often are able to overcome the lower activation energy
- 29. Multiple Choice
The following equation shows the reaction of zinc powder and hydrochloric acid.
Zn + 2HCl → ZnCl2 + H2
How can the rate of production of hydrogen be increased?
Increase the size of the zinc
Increase the volume of water in hydrochloric acid
Increase the volume of hydrochloric acid
Increase the temperature of hydrochloric acid
- 30. Multiple Choice
The following equation represents the complete combustion of a hydrocarbon.
CXH2y + yO2 -> xCO2 + yH2O
Which of the following are the values of x and y?
x = 1, y = 2
x = 2, y = 3
x = 3, y = 4
x = 4, y = 5
- 31. Multiple Choice
Which of the half equations represents the reactions at the anode(A) and the cathode(C)?
A: 4OH-→ 2H2O + O2 + 4e-
C: Fe2+ + 2e- → Fe
A: Ag → Ag+ + e-
C: Ag+ → Ag + e-
A: Ag → Ag+ + e-
C: Fe2+ + 2e- → Fe
A: 4OH- → 2H2O + O2 + 4e-
C: Ag → Ag+ + e-
- 32. Multiple Choice
What is X?
Zinc chloride
Zinc sulphate
Aluinium chloride
Aluminium sulphate
- 33. Multiple Choice
What is te rate of reaction?
0.10 cm3 min-1
7.60 cm3 min-1
10.60 cm3 min-1
37.40 cm3 min-1
- 34. Multiple Choice
Which structural formulae are isomers of butane?
- 35. Multiple Choice
What happens when natural rubbers is vulcanised?
The melting point of rubber decrease
The vulcanised rubber is less resistant to heat
Rubber molecules slide more easily over each other
Sulphur atoms form cross-links between rubber molecules
- 36. Multiple Choice
When but-2-ene is shaken with bromine water then decolourised. What is the product of this reaction?
1,2-dibromobutene
2,3-dibromobutene
1,2-diromobutane
2,3-dibromobutane
- 37. Multiple Choice
Which statement is correct about alkanes ?
Undergo polymerisation reaction
Undergo hydrogenation reaction
Undergo substitution reaction
Undergo hydration reaction
- 38. Multiple Choice
Which structural formula does not correspond to the named compound?
- 39. Multiple Choice
Which statement defines oxidation?
Increase in oxidation number
Gain of hydrogen
Loss of oxygen
Gain of electron
- 40. Multiple Choice
Which metal can prevent rusting when is it in contact with iron?
Lead
Silver
Copper
Magnesium
- 41. Multiple Choice
What is the oxidation number of X in X2O32- ion?
+2
+4
-2
-4
- 42. Multiple Choice
Based on the equation, which statement is correct?
The reaction is endothermic
The activatio energy is 210 kJ mol-1
The temperature of the mixture increase
The total energy of the reactants is lower than the products
- 43. Multiple Choice
100 cm3 of water is heated by the burning of a sample of ethanol. The heat released by the combustion is 10.5 kJ. What is the maximum increase i temperature of water?
(Specific heat capacity of water= 4.2 J g-1 oC-1)
0.025 oC
0.25 oC
2.5 oC
25 oC
- 44. Multiple Choice
What is meaning of heat of neutralisation?
The heat absorbed when acid react with an alkali
The heat released when acid react with alkali
The heat of change when one mole of water is formed from the reaction between acid and alkali
The heat of change when one mole of salt is formed from the reaction between acid and alkali
- 45. Multiple Choice
Which pair is matched correctly?
- 46. Multiple Choice
Ammonium sulphate is used as a fertiliser. What is the percentage by mass of nitrogen in ammonium sulphate?
(RAM: H=1; N=14; O=16; S=32)
10.6%
12.3%
13.3%
21.2%
- 47. Multiple Choice
In order to produce a glass that is more resistant to heat and chemicals, substances X is added to soda lime glass.
What is X?
Boron oxide
Lead(II) oxide
Sodium carbonate
Calcium carbonate
- 48. Multiple Choice
Which substances is a natural polymer?
Polyethene
Polypropene
Polyisoprene
Polyvinly chloride
- 49. Multiple Choice
Which substance is a composite material?
Alloy
Glass
Ceramics
Fibre glass
- 50. Multiple Choice
Why sodium chloride used in the preparation of soap?
To speed up the reaction to produce soap?
To produce soap which foams easily
To reduce solubility of soap
To make soap softer
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