SK 2021 Chem paper 1A
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Subject
Chemistry
Date
Nov 24, 2024
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MOCK EXAM / 2020
-
2021 / S6CHEM / Paper 1(A) / P.1 of 10
CHRISTIAN & MISSIONARY ALLIANCE SUN KEI SECONDARY SCHOOL MOCK EXAMINATION 2021 CHEMISTRY PAPER 1
Name:
________________________ Time Allowed:
2 hours 30 minutes Class:
S.6____
No.: __________ Total Marks: 120
This paper must be answered in English.
GENERAL INSTRUCTIONS
1. There are TWO
sections, A and B, in this Paper. You are advised to finish Section A in about 45 minutes. 2. Section A consists of multiple-choice questions in this question paper, while Section B contains conventional questions printed separately in Question-Answer Book B
. 3. Answers to Section A should be marked on the Multiple-choice Answer Sheet while answers to Section B should be written in the spaces provided in Question-Answer Book
B
. The Answer Sheet for Section A and the Question-Answer Book for Section B will be collected separately at the end of the examination
. 4. A Periodic Table is printed on page 19 of Question-Answer Book B
. Atomic numbers and relative atomic masses of elements can be obtained from the Periodic Table. INSTRUCTIONS FOR SECTION A (MULTIPLE
-
CHOICE QUESTIONS)
1. Read carefully the instructions on the Answer Sheet. After the announcement of the start of the examination, you should insert the information required in the spaces provided.
2.
When told to open this book, you should check that all the questions are there. Look for the words “
END OF SECTION A
” after the last question.
3.
All questions carry equal marks.
4.
ANSWER ALL QUESTIONS
. You are advised to use an HB pencil to mark all the answers on the Answer Sheet, so that wrong marks can be completely erased with a clean rubber. You must mark the answers clearly; otherwise you will lose marks if the answers cannot be captured. 5. You should mark only ONE
answer for each question. If you mark more than one answer, you will receive NO MARKS for that question.
6.
No marks will be deducted for wrong answers.
MOCK EXAM / 2020
-
2021 / S6CHEM / Paper 1(A) / P.2 of 10
This section consists of two parts. There are 24 questions in PART I and 12 questions in PART II.
Choose the best answers for each question. Candidates may refer to the Periodic Table printed on the p.19 of Question
-
Answer Book B.
PART I
1.
Which of the following statements about Group I metals is INCORRECT? A.
Reactivity of the metals increases down the group. B.
They all have one outermost shell electron in their atoms.
C.
They all react with cold water to form an alkaline solution. D.
They all tarnish in air to form a water
-
insoluble oxide.
2.
Which of the following atoms has the same number of neutrons as 60
Ni? A.
64
Zn B.
62
Ni C.
59
Co D.
55
Mn 3.
The following flow chart shows how calcium sulphite can be produced from compound X
.
Which of the following combinations is correct?
Compound X
Process Y
A.
Calcium oxide
Adding sodium sulphate solution
B.
Calcium carbonate
Adding dilute sulphuric acid
C.
Calcium oxide
Adding aqueous sulphur dioxide
D.
Calcium nitrate
Adding dilute sulphurous acid
4.
Carbon monoxide (CO), hydrogen sulphide (H
2
S) and carbon disulphide (CS
2
) are gases produced during volcanic eruptions. A mixture of these gases was analysed by combustion in excess oxygen. If the mole ratio of CO : H
2
S : CS
2
in the mixture was 1 : 3 : 1, what will be the mole ratio of SO
2
: CO
2
produced after combustion? A.
5 : 2 B.
3 : 2 C.
5 : 1 D.
1 : 1 5.
Iron rusts faster in industrial areas than in rural areas because
A.
rural areas are windier than industrial areas.
B.
the rainwater in industrial areas is more acidic than that in rural areas.
C.
industrial areas are more humid than rural areas.
D.
the temperature in industrial areas is lower than that in rural areas.
6.
The following diagram shows a part of the structure of an addition polymer.
Which of the following combinations about its monomer is correct?
Empirical formula of the monomer
Systematic name of the monomer
A.
C
4
H
6
O
2
Methylpropenoic acid
B.
C
4
H
6
O
2
But
-
2
-
enoic acid
C.
C
2
H
3
O
Methylpropenoic acid
D.
C
2
H
3
O
But
-
2
-
enoic acid
compound X
limewater
calcium sulphite
adding water
process Y
MOCK EXAM / 2020
-
2021 / S6CHEM / Paper 1(A) / P.3 of 10
7.
Metal M
forms an oxide with the chemical formula M
2
O
3
. When 3.00 g of M
2
O
3
is reduced by excess carbon monoxide, 2.10 g of M
is obtained. What is the relative atomic mass of M
?
(Relative atomic mass: O = 16.0)
A.
24.8
B.
27.0
C.
54.9
D.
56.0
8.
Refer to the following flow chart about a white crystalline solid P
:
Which of the following compounds may solid P
be?
A.
Aluminium sulphate B.
Ammonium chloride C.
Ammonium sulphate D.
Magnesium chloride 9.
In an experiment, a zinc rod and a copper rod are dipped into dilute sulphuric acid, with their top ends touching each other. Hydrogen is produced around the copper rod. Which of the following statements about the experiment is correct? A.
Copper reacts with dilute sulphuric acid to give hydrogen. B.
Zinc reacts with water to give zinc ions. C.
Electrons flow from the zinc rod to the copper rod. D.
The zinc rod will be coated with copper. 10.
Which of the following statements best explain why butane has a higher boiling point than methane? A.
The molecular size of butane is larger than that of methane. B.
The molecular mass of butane is larger than that of methane. C.
Butane molecules contain polar bonds while methane molecules do not. D.
Butane molecules are polar while methane molecules are not. 11.
5.0 cm
3
of distilled water is added to 10.0 cm
3
of 0.125 M HCl(aq). What is the pH of the resultant solution?
A.
0.90
B.
1.08
C.
1.21
D.
2.10
A white crystalline solid P
A colourless gas
warm with NaOH(aq)
A colourless solution
The paper turns blue
test with moist red litmus paper
A white precipitate
add dilute HNO
3
(aq) and then AgNO
3
(aq)
copper rod
hydrogen
zinc rod
dilute sulphuric acid
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MOCK EXAM / 2020
-
2021 / S6CHEM / Paper 1(A) / P.4 of 10
12.
Consider the reaction of ethane with bromine under light. The following enthalpy level diagram represents one of the reaction steps involved. Which of the following steps does this diagram best represent? A.
Br
2
Br
• + Br
•
B.
CH
3
CH
3
+ Br
•
CH
3
CH
2
• + HBr C.
CH
3
CH
2
• + Br
2
CH
3
CH
2
Br + Br
•
D.
CH
3
CH
2
• + CH
3
CH
2
•
CH
3
CH
2
CH
2
CH
3
13.
The following chemical reaction takes place in a silver oxide cell.
Ag
2
O(s) + Zn(s) + H
2
O(l)
2Ag(s) + Zn(OH)
2
(s)
What is the role of silver oxide in the cell?
A.
It is the negative electrode and the oxidizing agent.
B.
It is the negative electrode and the reducing agent.
C.
It is the positive electrode and the oxidizing agent.
D.
It is the positive electrode and the reducing agent.
14.
Which of the following combinations about the structures of different substances is correct?
Simple molecular structure Giant ionic structure Giant covalent structure A.
SiO
2
HBr BeCl
2
B.
SiCl
4
MgO C(graphite) C.
SrO ICl
3
SnCl
2
D.
C
6
H
5
COOH P
4
O
10
SiO
2
15.
2.5 dm
3
of a hydrochloric acid is required
to react completely with 100 g of a sample of calcium carbonate, which is 85% pure. What is the concentration of the hydrochloric acid? (Relative atomic masses: C = 12.0, O = 16.0, Ca = 40.1) A.
0.34 mol dm
3
B.
0.40 mol dm
3
C.
0.68 mol dm
3
D.
0.80 mol dm
3
16. Which of the following processes would produce hydrogen?
A.
Adding magnesium to cold water
B.
Adding sodium hydrogencarbonate powder to dilute sulphuric acid
C.
Adding zinc to concentrated sulphuric acid
D.
Electrolysing dilute sodium nitrate solution
17.
Which of the following apparatus is/are required to prepare standard oxalic acid solution from oxalic acid crystals?
(1)
(2)
(3)
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
reactant(s)
product(s)
enthalpy
MOCK EXAM / 2020
-
2021 / S6CHEM / Paper 1(A) / P.5 of 10
18.
Which of the following statements concerning the first member of a homologous series is/are correct? (1)
It must possess one carbon atom only. (2)
It must be the least dense one in its own series. (3)
It must be a gas under room conditions. A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
19.
A student uses the following set
-
up to perform an experiment involving octane. The glass wool soaked with octane is heated occasionally and aluminium oxide is heated strongly.
Which of the following statements about the experiment is/are correct?
(1)
The litmus solution turns red.
(2)
The bromine solution is decolorized.
(3)
A chemical change occurs at the aluminium oxide.
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
20.
Which of the following methods can be used to obtain iron from iron compounds?
(1)
Placing a copper strip in iron(III) nitrate solution
(2)
Heating iron(III) oxide with carbon monoxide
(3)
Electrolysing molten iron(II) chloride
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
21. The structure of glucose is shown below. Which of the following statements is/are correct? (1)
The hydrogen atoms in the hydroxyl groups can form hydrogen bonds with water molecules. (2)
The hydrogen atom in the aldehyde group can form hydrogen bonds with ethanol molecules. (3)
All the oxygen atoms in glucose can form hydrogen bonds with propanone molecules. A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
litmus solution
bromine (dissolved in CCl
3
CH
3
)
heat
aluminium oxide
glass wool soaked with octane
MOCK EXAM / 2020
-
2021 / S6CHEM / Paper 1(A) / P.6 of 10
22.
Which of the following processes involve(s) redox reactions?
(1)
Neutralizing the excess acid in the stomach by taking antacids
(2)
Thickening the oxide layer of an aluminium object by anodization
(3)
Removing sulphur dioxide in waste gases by reacting it with calcium hydroxide A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
23.
Which of the following equations can represent a standard enthalpy change? (1)
HBr(aq) + NaOH(aq)
NaBr(aq) + H
2
O(l) (2)
2
H
2
O(l)
2H
2
(g) + O
2
(g) (3)
H
2
(g) + Br
2
(g)
2HBr(g) A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
24.
Consider the following statements and choose the best answer:
1
st
statement
2
nd
statement
When a piece of dry cobalt(II) chloride paper is dipped into a salt solution, the paper turns from blue to pink. Salt solution contains water. A.
Both statements are true and the 2
nd
statement is a correct explanation of the 1
st
statement.
B.
Both statements are true but the 2
nd
statement is NOT a correct explanation of the 1
st
statement.
C.
The 1
st
statement is false but the 2
nd
statement is true.
D.
Both statements are false.
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MOCK EXAM / 2020
-
2021 / S6CHEM / Paper 1(A) / P.7 of 10
PART II 25. Excess calcium carbonate was mixed with dilute hydrochloric acid under different conditions. The table below shows the conditions of the two experiments.
Experiment
Temperature (
C) Concentration of HCl(aq) (mol dm
3
)
Volume of HCl(aq) used (cm
3
)
I
35
2.0
50
II
25
1.5
100
Which of the following graphs shows the results of the two experiments?
A.
B.
C.
D.
26.
Consider the following reaction:
Which of the following statements about the reaction is INCORRECT?
A.
It is the reaction between an N
-
substituted amide and dilute sodium hydroxide solution.
B.
This reaction is irreversible.
C.
This reaction is regarded as a hydrolysis.
D.
Ammonia is one of the products of the reaction.
27.
What is the major product formed when 1 mol of buta-1,3-diene reacts with 1 mol of hydrogen bromide? A.
B.
C.
D.
Volume of gas (cm
3
)
Time (s)
II
I
Volume of gas (cm
3
)
Time (s)
II
I
Volume of gas (cm
3
)
Time (s)
II
I
Volume of gas (cm
3
)
Time (s)
I
II
MOCK EXAM / 2020
-
2021 / S6CHEM / Paper 1(A) / P.8 of 10
28. Consider the following two reversible reactions.
Reaction I: X
2
(g) +
2
1
Y
2
(g) X
2
Y
(g)
Reaction II: 2
X
2
Y
(g) 2
X
2
(g) + Y
2
(g)
The numerical value of K
c
for reaction I is 2. Under the same conditions, what is the numerical value of K
c
for reaction II?
A.
2
1
B.
2
1
C.
4
1
D.
2 29.
Which of the following combinations concerning sodium oxide and phosphorus pentoxide is INCORRECT?
Sodium oxide
Phosphorus pentoxide
A.
Giant ionic structure
Simple molecular structure
B.
Basic oxide
Acidic oxide
C.
Reacts with water vigorously
Does not react with water
D.
Conducts electricity when molten
Does not conduct electricity when molten
30.
The following equation represents the reaction between aluminium powder and anhydrous barium nitrate: 10Al(s) + 3Ba(NO
3
)
2
(s)
3N
2
(g) + 5Al
2
O
3
(s) + 3BaO(s)
What is the volume of nitrogen produced (measured at room temperature and pressure) when 1.0 g of anhydrous barium nitrate reacts with excess aluminium powder
?
(Relative atomic masses: N = 14.0, O = 16.0, Ba = 137.3; molar volume of gas at room temperature and pressure = 24.0 dm
3
mol
1
)
A.
91.8 cm
3
B.
135 cm
3
C.
174 cm
3
D.
184 cm
3
31.
Compound W
has the following properties: (1) It reacts with hydrogen in the presence of nickel catalyst. (2) It reacts with sodium hydroxide solution to form an ionic compound. (3) It does not react with acidified potassium dichromate solution. Which of the following compounds may W
be? A.
CH
2
=CHCO
2
H B.
CH
2
=CHCH
2
OH C.
CH
3
CHO D.
CH
3
COCH
3
MOCK EXAM / 2020
-
2021 / S6CHEM / Paper 1(A) / P.9 of 10
32.
At a certain temperature, the value of the equilibrium constant for the following reversible reaction is 1.
A
(g) B
(g)
Which of the following statements about the reaction at equilibrium are correct?
(1)
There are 50% of product and 50% of reactant in the equilibrium mixture.
(2)
The forward reaction and the backward reaction proceed at the same rate.
(3)
The value of equilibrium constant remains constant at constant temperature.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
33.
The structure of ascorbic acid is shown below. Which of the following statements about ascorbic acid are correct? (1)
It has two chiral carbons. (2)
It can turn acidified potassium dichromate solution from orange to green. (3)
It contains a carboxyl group. A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
34.
Bromine reacts with methanoic acid slowly to produce hydrobromic acid and carbon dioxide. The equation below shows the reaction involved. Br
2
(aq) + HCOOH(aq)
2HBr(aq) + CO
2
(g) Which of the following methods can be used to monitor the progress of the reaction? (1)
Measuring the change in pressure of the reaction system with time (2)
Measuring the change in mass of the reaction mixture with time (3)
Measuring the change in colour intensity of the reaction mixture with time A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
35.
In the Contact process, sulphur dioxide and air react to give sulphur trioxide. The following equation represents the reaction involved.
2SO
2
(g) + O
2
(g) 2SO
3
(g)
Which of the following statements about the above reaction are correct?
(1)
This is a redox reaction.
(2)
Nickel(II) oxide can be used as a catalyst.
(3)
Under the same conditions, the yield of sulphur trioxide will increase if pure oxygen is used instead of air.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
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MOCK EXAM / 2020
-
2021 / S6CHEM / Paper 1(A) / P.10 of 10
36.
Consider the following statements and choose the best answer:
1
st
statement
2
nd
statement
Under room conditions, carbon has the highest electrical conductivity among the Period 2 elements.
Graphite can conduct electricity under room conditions.
A.
Both statements are true and the 2
nd
statement is a correct explanation of the 1
st statement.
B.
Both statements are true but the 2
nd
statement is NOT a correct explanation of the 1
st
statement.
C.
The 1
st
statement is false but the 2
nd
statement is true.
D.
Both statements are false.
END OF SECTION A
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Chem159 - Practice 5 Compounds
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Liam A Fox (laf251)
Practice
20
297:49:47
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(Not Answered)
45.3 g of magnesium sulfate heptahydrate is heated in an oven until all the water is driven off. What is the mass of the anhydrous
compound?.
9.28 g
21.5 g
23.8 g
22.1 g (Correct answer)
23.2 g
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Question 7
How many Faraday is needed to deposit 1.8 g of Sodium (Na) from NaCl solution using electrolysis process.
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O CHEMICAL REACTIONS
Identifying the limiting reactant in a drawing of a mixture
The drawing below shows a mixture of molecules:
key
carbon
hydrogen
nitrogen
sulfur
oxygen
chlorine
Suppose the following chemical reaction can take place in this mixture:
CO(g)+2 H,(9) → CH,OH(9)
Of which reactant are there the most initial moles? Enter its chemical formula:
Of which reactant are there the least initial moles? Enter its chemical formula:
Which reactant is the limiting reactant? Enter its chemical formula:
Explanation
Check
FEB
13
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There is one incorrect answer here. Can you help me figure out which one?
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determine the mass in grams of 1.6x10-3 mol glucose, C6H12O6
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Building Vocabulary
From the list below, choose the term that best completes each sentence.
matter
physical change
endothermic reaction
chemical change
chemistry
precipitate
exothermic reaction
7. Any change that alters a substance without changing it into another
substance is a(n)
8.
is anything that has mass and takes up space.
9. A reaction that releases energy in the form of heat is called a(n)
10. A(n)
absorbed.
11. A chemical reaction is also referred to as a(n)
is a reaction in which
energy
is
12. A(n)
a chemical reaction.
is a solid formed from a solution during
13.
is the study of the properties of matter and
how matter changes.
OPearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved…
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