WorksheetsSPM Chemistry Chap 2 & 3
Total questions: 27
Worksheet time: 52mins
The average mass of helium atom is 4 times greater than the mass 1/20 of carbon-12 atom. What is the relative atomic mass of helium ?
2
4
24
48
Which of the following are correct about the Kinetic Theory pf Matter ?
I. Matter consists of tiny, discrete particles which are static.
II. Movement of particles is not affected by heat.
III. Particles move in random motion and collide with each other.
IV. Movement of particles is affected by heat.
I and II
I and III
II and IV
III and IV
Diagram below shows the arrangement of particles in three states of matter at room temperature. Which of the following could possible be substances P, Q, R.
P : Iron
Q : Oxygen
R : Ethanol
P : Ethanol
Q : Iron
R : Oxygen
P : Oxygen
Q : Ethanol
R : Iron
P : Iron
Q : Ethanol
R : Oxygen
Diagram show the heating curve of substance M. Which statement is correct about property of substance M ?
The particles are all in liquid state at t1 - t2
The melting point of substance M is 1413 °C
The kinetic energy of particles in substance M at
t3 - t4 is higher than t1 - t2
Heat is released to the surroundings at t2 - t3 so that the liquid particles attract one another to form a solid.
Choose the right match for the development of the atomic model.
Diagram shows the electron arrangement of atom Y. What is the atomic number of element Y ?
7
9
10
18
The table shows the proton number for elements P,Q,R and S.
P and Q
P and R
Q and S
R and S
Diagram 5 shows the electron arrangement of atom R. Which of the following is the standard representation of atom of element R ?
Which of the following are the similarities between isotopes of an element ?
I. Number of protons
II. Number of neutrons
III. Chemical properties
IV. Physical Properties
I and II
I and III
II and IV
III and IV
Below shows several isotopes and their uses.
I. Carbon- 12 : To estimate the age of fossils.
II. Sodium-24 : To kill cancer cells.
III. Phosphorus- 32 : To measure the rate of absorption of fertilisers by plants.
IV. Carbon-14 : To estimate age of fossils.
I and II
I and III
II and IV
III and IV
Which of the following statement is correct ?
The mass of a carbon-12 atom is 18 times heavier than one molecule of water.
The relative molecular mass of water is 18 times lighter than 1/12 times of the mass of a carbon-12 atom.
The relative molecular mass of water os 18 times heavier than 1/12 times of the mass of a carbon-12 atom.
The relative atomic mass of water is 18 times heavier than 1/12 times of the mass of a carbon-12 atom.
Calculate the mass of 0.05 mol zinc chloride produced from the reaction of zinc and hydrochloric acid. [Relative atomic mass Zn = 65, Cl = 35.5]
3.35g
6.80g
32.50 g
68.00g
0.046
0.075
46
75
When magnesium carbonate is heated, the gas released turns lime water chalky. What is the volume of gas released when 0.55 g of magnesium carbonate is heated at STP ? [Relative atomic mass: C = 12, O = 16, Mg = 24 ; Molar volume of gas at STP = 22.4 dm3 mol-1]
0.00655 dm3
0.0146 dm3
146 cm3
655 cm3
Acetylene, C2H2 gas is used in welding and cutting process. The diagram shows an acetylene gas cylinder. How many hydrogen atoms are present in the cylinder ? [Avogadro constant = 6.02 x 1023 mol-1]
3.01 x 1023
6.02 x 1023
1.2 x 1024
2.4 x 1024
The formula for potassium dichromate is Kx Cr2 O7. Given the relative formula mass of the compound is 294 g mol-1. What is the value of x ? [Relative atomic mass: O = 16, K = 39, Cr = 52, ]
1
2
3
4
Diagram shows the apparatus set-up to determine the empirical formula of magnesium oxide. What is the purpose of raising the crucible lid once in awhile during heating ?
To obtain a constant mass of magnesium oxide.
Because the melting point of magnesium is high
To avoid from overheating magnesium ribbon
To allow the oxygen enters and reacts with magnesium ribbon
Caffeine is an active compound found in coffee. It helps to increase alertness when consumed. Diagram shows the percentage by mass of elements in caffeine. What is the empirical formula for caffeine ? [Relative atomic mass : H = 1, C = 12, N=14,
O = 16 ]
CHNO
C2H5NO2
C4H5N2O
C8H10N4O2
The following chemical equation represents the combustion of propane gas.
C3H8 + 5O2 → 3CO2 + 4H2O
Which of the following explanation is correct ?
Number o atoms in carbon dioxide produced is same as the number of atoms in propane gas.
1.5 mol of carbon dioxide gas is produced when 0.5 mol of propane gas reacts with 2.5 mol of oxygen gas.
1.0 g of propane gas reacts with 5 g of oxygen gas to produce 3 g of carbon dioxide gas and 4 g of water.
11 molecules of propane react with 10 molecules of oxygen to produce 6 molecules of carbon dioxide and 9 molecules of water.
Table 1 shows the molecular formulae of three hydrocarbon compounds. The relative molecular mass of hydrocarbon Z is 84 and its empirical formula is CH2. Determine its molecular formula.
1.75g of butane gas is used to boil 150 cm3 of water. Calculate the number of molecules of the butane gas. [Relative atomic mass : C = 12, H=1, Avogadro constant = 6.02 x 1023 mol-1]
State the meaning of empirical formula
i ) Give one observation for this experiment
ii) List two precautionary steps that must be taken while conducting the experiment.
iii) How can we determine that the reaction is completed ?
i ) Name process Q
ii ) When solid x changes to liquid, state the changes in the energy particles and the forces of attraction between the particles.
Balance the chemical equation :
H2O2 → H2O + O2
2.4g of magnesium powder reacted with sliver nitrate solution to produce magnesium nitrate solution and solid sliver. The equation below shows the reaction that occurred. [Relative atomic mass : Mg = 24, Ag = 108, O = 16 ; Avogadro constant = 6.02 x 1023 mol-1]
Mg + AgNO3 → Mg (NO3)2 + Ag
i) Balance the equation above
ii) Calculate the number of moles of magnesium powder used.
iii) Determine the number of moles of sliver nitrate that was used in this reaction.
