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7/29/2019 1275177781 2009 Chemistry Half Yearly
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HOMEBUSH BOYS HIGH SCHOOL
YEAR 11 PRELIMINARY
HALF YEARLY EXAMINATION
CHEMISTRY
2009
1 Hour
Student Name.Teacher..
GENERAL INSTRUCTIONS
Reading time 5 minutes
Working time 1 hour
Write using blue or black pen
Draw diagram and graphs using pencil Board approved calculators may be used
TOTAL MARKS 50
Section I 15 marks(Questions 1 15)
Section II 35 marks(Questions 16 - 23)
A Data Sheet and Periodic Table are provided with this paper
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Section I 15 marks
Attempt Questions 1 15. Allow about 15 minutes for this part.
Use the multiple choice answer sheet provided
____________________________________________________________________________
1. A mixture of ethanol and water can be separated by:
A centrifugation
B distillation
C decanting
D crystallisation
2. An atom has a mass number of 46 and an atomic number 26. The atom would be:
A iron with 20 neutrons
B iron with 40 neutrons
C zirconium with 20 neutrons
D zirconium with 40 neutrons
3. The following table represents the chemical composition of:
A the biosphere
B the hydrosphere
C the atmosphere
D the lithosphere
4. Which of the following elements is classified as a monatomic molecule?
A nitrogen
B oxygenC fluorine
D neon
5. Atoms of element Q contains 16 protons, atoms of element R contain 9 protons.
Which one of the following gives the correct formula and bonding type for a compound of Q and R?
A Q2R with ionic bonds
B Q2R with covalent bonds
C QR2 with ionic bonds
D QR2 with covalent bonds
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6. The following table contains a selection of cations and anions
Select the set ofCORRECT formulae
A SnSO4, NH4(PO4)3, Al(NO3)3B NH4NO3, Sn3(PO4)2, Al3(SO4)2C Sn3(PO4)2, NH4(SO4)2, Al(NO3)3D Al2(SO4)3, (NH4)3PO4, Sn(NO3)2
7. Which of the following is NOT a property of a solid non-metal?
A poor conductor
B malleable
C brittleD low melting point
8. A hard, rigid substance that would have a very high melting point and be a non-conductor of electricity
in the molten state would be:
A CO2B SiO2C PbO2D TiO2
9. Which of the following compounds would have the highest melting point?
A NaCl
B HCl
C CO2D SiCl4
10. Examine the crystal lattice below:
This compound would:
A be very hard
B have a low melting pointC conduct electricity well
D be easily distorted
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11. Examine the apparatus set up.
It was used by a student in an experiment to determine one
of the significant properties about chemical compounds.
This set up would most likely have been used to determine:
A the melting point of the compound
B the solubility of the compound
C the conductivity of the compound
D the stability of the compound when heated
Solder is a common alloy used in plumbing. Which metals are present in solder?
A brass and copper
B zinc and lead
C lead and tin
D tin and zinc
13. Which of the atom pairs with electron configurations below could form a covalent bond?
A 2,1 and 2,8,5
B 2,4 and 2,8,4
C 2,8,1 and 2,2
D 2,8,8 and 2,7
14. In which of the following do BOTH processes involve physical changes?
A burning coal; evaporating alcohol
B melting sugar; dissolving copper sulfate in water
C boiling water; forming rust on an iron nail
D heating copper carbonate; dissolving sugar in water
15. What type of bonding is shown by the structures given below?
IONIC COVALENT METALLIC
A X Y Z
B Y X Z
C Z X YD Y Z X
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Section II 35 marks
Attempt Questions 16 23. Allow about 45 minutes for this part.
____________________________________________________________________________
Question 16 (3 marks)
Calcium chloride absorbs moisture from the atmosphere. A 46.75 g sample of moist calcium chloride
was heated in a drying oven to remove all the water. The final mass of the sample was 19.08 g
a. Determine the percentage composition of water in the sample 2
b. Write the chemical formula for calcium chloride 1
Question 17 (5 marks)
a. Draw the Lewis electron dot diagram for the oxide ion 1
b. Draw the Lewis electron dot diagram for the oxygen molecule 1
c. What is the name of the compound ZnO? 1
d. Indicate how the formation of bonds in ZnO differ from the formation of bondsin 2
the O2 molecule?
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Question 18 (5 marks)
The table below lists the properties of five substances known to be magnesium, diamond, iodine,
potassium chloride and hydrogen chloride.
Property A B C D EMelting point (oC) 3880 -114 650 114 770
Solid conducts electricity No No Yes No No
Soluble in water No Yes Yes No Yes
Aqueous solution conducts
electricity
N/A Yes N/A N/A Yes
Use the information in the table to identify substances A, B, C, D & E andjustify (give a reason)
your answers
Question 19 (3 marks)
Write the formula for the following:
a. carbon monoxide........
b. ammonium hydroxide
c. sodium hydrogen carbonate
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Question 20 (7 marks)
During your course you performed a first hand investigation to compare the properties ofTWO elements
with the properties of the compound obtained by reacting these two elements.
a. Outline the experimental steps that were necessary for you to carry out this experiment. 5
Present the results you obtained in a table (use at least 1 set of results for each substance)
b. Identify TWO hazards in this experiment, and describe how you dealt with these hazardous 2
situations
Question 21 (3 marks)
Use a copy of the periodic table of the elements to name an element which has:
a) A valency of +2..
b) A valency of 1 and is found in period 4
c) A member of the actinide series..
d) An alkali metal.
e) a member of the Noble gases...
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f) a transition metal in the same period as iron
Question 22 (3 marks)
Write balanced chemical equations for the following reactions
a. Calcium carbonate reacts with hydrochloric acid to produce a salt, water and carbon dioxide 1
b. Zinc reacts with copper (II) sulfate to form copper metal and zinc sulfate 1
c. Reaction of magnesium with sulfuric acid will produce a salt and a gas 1
Question 23 (6 marks)
a. Write a balanced equation to show the electrolysis of water. (Include states) 1
b. Is electrolysis of water a chemical or physical change. Justify your answer 2
c. Compare the molecular changes that take place during the electrolysisof water with those that 3
occur during the boiling of water. Include one diagram to illustrate your answer
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