SOALAN KIMIA
Answer all questions
1 The figure below shows the heating curve for substance N
Which of the following gives the correct states of substance N at X, Y and Z as shown in the graph?
A B C D
X Y Z
solid liquid gas solid solid and liquid gas
solid solid and liquid liquid liquid liquid and gas solid TemperatureoC
Z
Y
X
2 Which of these is the correct sequence of scientific method of investigation ?
A B C D
Observation → inference → determining the variables → doing experiment Analysing data → collecting data → making conclusion → identifying problem Hypothesis → doing the experiment → conclusion → inference
Doing the experiment → hypothesis → analysing data → inference
3 The figure below shows an electron arrangement of Y2+
How many protons and electrons does an atom of Y contain ?
A
An atom of helium contains two electrons
An atom of helium has two protons and four neutrons in its nucleus Helium has a proton number of 4
5 The relative formula mass of ammonium phosphate, (NH4)3PO4 is [ Relative atomic mass of H=1, N=14, O=16 and P=31]
A
What is the chemical formula of rouge ? [ Relative atomic mass of Fe=56 and O=16 ]
8 Which of the following electron arrangements is found in an atom of a noble gas?
9 The following table shows the proton number and nucleon number of atom X
Proton number 9
Which of the following shows the position of X in the Periodic Table of elements?
10 The table below shows the position of 2 elements, P and Q, in the Periodic Table of
Elements.
Which of the following is true about elements P and Q ?
A B C D
The atoms of P are smaller than the atoms of Q
Atoms of P have stronger attraction for other electrons
The number of positive charges in the nucleus of P is less than Q Atoms of Q have a higher tendency than P to release electrons
11 The chemical symbol of an element T is as shown :
Element Proton Number
H 1
Na 11
Mg 12
S 16
12 The electron arrangement of atom X = 2.8.7. What is the formula of the ion formed
from X ?
Which of the following is true when X react with Y?
A
The compound formed has a formula of XY2
The compound formed is made up of molecules
14 The proton numbers of a few elements are as shown :
With the atoms of which element would chlorine atoms combine by sharing electrons?
I H
III Mg
15 The following diagram shows the apparatus set up for an elelctrolysis.
16 The pH scale below shows the position of five aqueous solutions P, Q, R, S and T, of
equal concentration.
1 7 14 pH Scale
What could the aqueous solutions be ?
17 Which of the following mixtures of elements forms the most suitable alloy for
manufacturing of racing bicycle which is light and firm?
18 The followings are the properties of glass. Which of the followings are true?
I low melting point.
II they are good insulators of heat.
III resistant to chemicals
19 The following chemical equations show two chemical reactions that took place.
Which of the following shows the correct reaction represented by X and Y ?
D Oxidation Reduction
20 Which of the following is the IUPAC name for the structural formula shown
below?
21 Which of the following is correct regarding the physical properties of pentene,
C5H10?
Pentene exists in the form of gas at room temperature
Complete combustion of pentene will produce 4 moles of carbon dioxide gas. Pentene is insoluble in water but is soluble in organic solvent.
22 Which of the following best explains the statement below?
Combustion of hexene is sootier than that of hexane
A B C
D
Hexane molecule has more hydrogen atoms than hexene molecule. The van der Waals’ forces between hexene molecules are stronger.
Percentage by mass of carbon in hexene molecule is higher than that in hexane molecule.
The size of hexene molecule is larger.
23 In a reaction temperature will increase the rate of reaction because it will
B C D
increase the energy of particles involved in the reaction decrease the effective collision of particles involved increase the rate of collision among the particles
24 The table shows the volume of oxygen gas obtained at regular intervals for the
decomposition of hydrogen peroxide, H2O2
Time(min) Volume of oxygen gas (cm3)
The everage rate of decomposition of hydrogen peroxide from the second minute to the fourth minute is
25 The graph below shows the volume of gas produced against time for the reaction of
The gradient of the graph decreases with time because
26 Which of the following will increase the frequency of collision?
I Use reactant with larger size
II Increase the concentration of reactant
III Increase the temperature of reaction
IV Remove the product of reaction
A
27 The equation below shows one of the reaction to produce hydrogen gas
2HCl + Zn ZnCl2 + H2
Which of the following would increase the rate of production of hydrogen gas? A
A
29 Which of the following is an oxidising agent?
A
30 The figure below shows the change in the heat of combustion of a few alcohols.
The increase in the heat of combustion of alcohols as shown is due to
A B C D
an increase in the sootiness of the alcohols when burnt an increase in the reactivity of alcohols
an increase in the relative molecular mass
SOALAN STRUCTURE
1. Figure below shows the structural formulae of compounds J, K and L
(a) State the homologous series for compounds J and K
Compound J : ………
Compound K : ………
[ 2 marks ]
[ 1 mark ]
(c) (i) Name the compound K
……….
[ 1 mark ]
(ii) Another compound, M, is in the same homologous series as K. M has five carbon atom. Write the molecular formula for M.
………
[ 1 mark ]
(d) Draw the structural formula for another isomer of compound J. Name the isomer.
[ 2 marks ]
(e) When compound K is added into a test tube containing acidified potassium dichromate(VI) solution and heated for a few minutes, compound L is form.
(i) State one observation for this experiment
……….
[ 1 mark ]
(ii) Write a chemical equation for this reaction.
……….
Meta
Metal L Metal M
Salt solution L
1.0 mol dm-3
FIGURE 2
2. An experiment was carried out to construct an electrochemical series of metals. Figure 2 shows the voltaic cell set up to measure the potential difference between metal L and M.
The experiment was repeated by replacing metal M with metal J and Q
C
DIAGRAM 2.1
Diagram 2.1 shows the potential difference of three voltmeters A, B and C for the voltaic cells using the pairs of metal L and M, L and J and L and Q respectively.
Pair of Metals Voltmeter Potential difference(V)
(a) Record the voltmeter readings for the pairs of metals in Table 1.
(b) State the hypothesis of the experiment
...
... .
(c) Arrange J, L, M and Q metals in the descending order in the electrochemical series
……….
(d) Iron metal is located between metal M and metal L in the electrochemical series.
