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7/25/2019 Chem Prelim Mid Year 2010
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General Instructions
Reading time - 5 minutes
Working time - 1 hour
Write using black or blue pen. Draw
diagrams using pencil.
Calculators may be used
A Periodic Table is provided at the back of
this paper
Write your name and teachers name on this
cover page and on the
Multiple Choice Answer Sheet.
Total Marks = 50
Part A Pages 2 - 5
Multiple Choice -15 marks
Questions 1 - 15 (1 mark each)
Allow about 20 minutes for this section
Part B Pages 6 - 11
Written Responses - 35 marks
Attempt questions 16 23
Allow about 40 minutes for this section
Exam Requirements
1 exam paper
Periodic Table (Detach from back of exam)
Multiple Choice Answer Sheet (Detach from back of exam)
WRITE ALL ANSWERS IN THE APPROPRIATE SPACES PROVIDED IN THE
EXAMINATION PAPER
2010 Year 11
Mid Year Examination
Preliminary Chemistry
S T R A T H F I E L D G I R L S H I G H
S C H O O L
Name:
Teacher : Ms Gulline Ms DoddCircle your teachers name
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Part A: Questions 1 15 Multiple Choice Questions (ONE mark each)
Total =15 marks
Allow about 20 minutes for this partUse the Multiple Choice Answer Sheet attached to the back of this paper to record your
answers to this section. You may remove this answer sheet.
For each question, select the alternative (a), (b), (c) or (d) that best answers the
question. Place a cross X in the box on the Multiple Choice Answer sheet that
corresponds to this answer.
1. Which of the following contains only pure substances?
(a)
oxygen, steel, salt(b)
silver, steel, sodium
(c)
water, nitrogen, aluminium
(d)
water, air, salt
2. The following table lists some properties of four elements.
Element Melting point (C) Boiling point (C)
P 1410 3267
Q -7 59
R 321 767S -101 -34
Which of the elements listed is bromine?
(a)
P
(b)
Q
(c)R
(d)S
3. A substance that consists of molecules containing one atom is
(a) argon
(b)calcium
(c) chlorine
(d)water
4. A typical atom of phosphorus has
(a)15 protons, 31 neutrons and 15 electrons
(b)31 protons, 15 neutrons and 31 electrons
(c)
15 protons, 16 neutrons and 16 electrons(d)15 protons, 16 neutrons and 15 electrons
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5. The best way to separate a mixture of cooking oil and water to obtain both
components of the mixture is to
(a)
distil the mixture.(b)evaporate the mixture.
(c)
filter the mixture.
(d)use a separating funnel.
6. Which property distinguishes an element from a compound?
(a) Each element has unique properties
(b)
Elements are pure substances
(c)Elements have a fixed composition
(d)
Elements cannot be decomposed by chemical or physical means
7. What is shown in the diagram?
(a)An element
(b)A compound
(c)A mixture of compounds
(d)A mixture of an element and a compound
8.
From the positions of gallium and selenium in the periodic table, the formula for
gallium selenide should be
(a) GaSe
(b)
GaSe3
(c) Ga2Se3
(d)
Ga3Se2
9. Milk is an example of a mixture found in the
(a)Lithosphere
(b)Atmosphere
(c)Biosphere
(d)Hydrosphere
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10.Which of the following elements is a semi-metal?
(a)
Barium
(b)
Germanium(c)
Manganese
(d)
Iodine
11.
Which of the following is a chemical change?
(a)
Dissolving iodine in ethanol
(b)
Melting lead
(c)Burning magnesium ribbon
(d)
Evaporating salt water
12.Identify the group below in which all of the substances have covalent bonds.
(a)Oxygen, water, sodium chloride
(b)Oxygen, carbon dioxide, water
(c)Sodium chloride, barium oxide, potassium fluoride
(d)Oxygen, calcium oxide, hydrogen chloride
13.In which of the following is the valency of the chromium ion +3?
(a)CrCl2
(b)Cr2O3
(c)CrO2
(d)CrO3
14.
In the first twenty elements on the periodic table, the number of elements that areliquids and gases at 25C are
Liquid elements Gaseous elements
(a) 0 8
(b) 0 7
(c) 1 7
(d) 2 11
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15.In the following table, the substance which is most likely to be metallic is:
Melting point(C) Boiling point(C) Electrical conductivityin liquid state Electrical conductivityin solid state
(a) 660 2467 Yes Yes
(b) 113 445 No No
(c) 801 1465 Yes No
(d) -219 -183 No No
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Part B Questions 16 23
Total 35 marks
Write your answers in the spaces provided on this question paper.
Allow about 40 minutes for this part
Question 16 (3 marks)
The table below shows the effect of heating an element and a compound.
SubstanceAppearanceof substance
at 25C
Observation when
substance is heated in a
test tube in a Bunsen
burner flame
Observation when
heated substance in the
test tube is cooled back
to 25C
A Pink solid Forms a black solid Black solid remains.
B Yellow solid Forms a dark yellow
liquid
Yellow solid reforms.
Based on the information in the table, classify each of the substances A and B as an
element or a compound and justify your classification.
Marks
3
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Question 17 (4 marks)
A student was provided with a mixture of iron (II) oxide, marble chips and sodium
sulfate. She was also supplied with the following information about the properties
of the three components which made up the mixture.
ComponentAppearance of
substance
Melting
point (C)
Solubility in
water
Density
(g/cm3)
Iron (II) oxidePowdered
black solid1360 insoluble 5.7
Marble chips
Large round
white /brown
pieces
1339 insoluble 2.7
Sodium sulfatePowdered
white solid884 soluble 2.7
Describe a procedure that the student could use to separate this mixture in the
science laboratory and recover each of the components.
Marks
4
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Question 18(6 marks)
A chemist heated a sample of magnesium in a flask containing chlorine gas. The
magnesium reacted with the chlorine gas to form a compound.
(a) Name and write the formula of the compound formed.
(b) Explain the formation of this compound. Use Lewis electron dot diagrams
to support your answer.
Marks
2
4
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Question 19 (4 marks)
In your course you performed a first-hand investigation to decompose a carbonate
and identify the products formed.
(a) Identify the carbonate that was used in your investigation.
(b) Outline the process used to decompose the carbonate.
(c) Name ONE of the products of this process and describe the test that you usedto identify this product.
Marks
1
1
2
Question 20 (5 marks)
Complete the diagram below to show the decomposition of water.
Explain the difference in the energy required to decompose water compared to theenergy required to evaporate water.
2
3
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Question 21 (3 marks)
Name a metal element and account for a use of this metal element in terms of its
physical properties.
Marks
3
Question 22 (6 marks)
Chlorine gas reacts with calcium to form the compound calcium chloride.
Chlorine gas will also react with nitrogen to form nitrogen trichloride.
(a) Write the chemical formula for nitrogen trichloride.
(b) Describe the properties of melting point and electrical conductivity for the
compound nitrogen trichloride.
(b) Explain why calcium chloride will conduct electricity in the molten state
(melted), however, it does not conduct electricity as a solid.
1
2
3
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Question 23 (4 marks)
In your chemistry course you have used models to demonstrate substances or
processes. With reference to one model that you have used, discuss the advantages
and disadvantages of using models in Chemistry.
Marks
4
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STRATHFIELD GIRLS HIGH SCHOOL
PRELIMINARY CHEMISTRY
MID YEAR EXAMINATION 2010
MULTIPLE CHOICE ANSWER SHEET
Name:____________________________________________________
Teacher : Ms Dodd Ms Gulline
Circle your teachers name
Select the alternative A,B,C or D that best answers the question. Fill in the response by
placing a cross (X) in the box corresponding to the chosen alternative.
A B C D
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