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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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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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


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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Name a metal element and account for a use of this metal element in terms of its

physical properties.

Marks

3


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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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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chem prelim mid year 2010

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