Tasmanian Certificate of Education External Assessment 2016

CHEMISTRY (CHM415115)

PART 3 Time: 45 minutes

Candidate Instructions 1. You MUST make sure that your responses to the questions in this examination paper will show

your achievement in the criteria being assessed. 2. Answer ALL questions. Answers must be written in the spaces provided on the examination paper. 3. You should make sure you answer all parts within each question so that the criterion can be

assessed. 4. This examination is 3 hours in length. It is recommended that you spend approximately 45 minutes

in total answering the questions in this booklet. 5. The 2016 External Examination Information Sheet for Chemistry can be used throughout the

examination. No other written material is allowed into the examination. 6. A TASC approved calculator can be used throughout the examination. 7. All written responses must be in English. On the basis of your performance in this examination, the examiners will provide results on each of the following criteria taken from the course statement: Criterion 7 Demonstrate knowledge and understanding of properties and reactions of organic and

inorganic matter.

© Copyright for part(s) of this examination may be held by individuals and/or organisations other than the office of Tasmanian Assessment, Standards and Certification.

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Pages: 12 Questions: 8 Attachments: Information Sheet

Section Total: /40

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In calculations no credit can be given for incorrect answers unless they are accompanied by details of the working. Some credit will be given for unsimplified answers. Appropriate units must be included. Note: When candidates are asked to ‘show that’: • a candidate should calculate their own answer to the appropriate number of significant figures and

use this subsequently. • a candidate who is unable to determine the required value should use the value given by the

examiner in subsequent questions. A spare diagram for Question 14 has been provided for you to use if required.

Additional Instructions for Candidates

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Question 12 Complete the following table: (2 marks)

Atomic Number of atom/ion

Electron configuration Symbol

10 Ne* (excited neon atom)

11 Na

12 1s22s22p63s1

13 Al3+

Question 13 Two separate balloons are prepared. One balloon contains hydrogen gas and the other balloon contains oxygen gas. Each balloon contains 0.1 mole of gas at room temperature and pressure. (a) Which balloon of gas, if any, would have the larger volume? Explain. (2 marks)

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(b) Under high pressure conditions which gas will behave more like an ideal gas? Explain.

(2 marks) ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................

(c) Which balloon of gas, if any, would have molecules with a higher average speed? Explain. (2 marks) ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................

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Question 14 Consider each of the following elements and their ground state electron configuration. [A] represents a noble gas electron configuration and ‘n’ the principal quantum number. W [A]ns1 Y [A]ns2np3 X [A]ns2 Z [A]ns2np4 (a) What does the principal quantum number, n, represent? (1 mark)

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(b) Which of the elements has the highest electronegativity? (1 mark)

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(c) What is the formula of the compound formed between elements W and Z? (1 mark)

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(d) Of the most stable ions formed from the elements W and X, which ion would have a

larger diameter? Explain your choice. (2 marks)

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Question 14 continues.

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Question 14 (continued) (e) The first three of the successive ionisation energies for element Y are represented on

the diagram below.

(i) On the diagram show the next three ionisation energies of element Y. Exact values are not expected, only the general trend. (2 marks)

(ii) Explain the trend(s) you have shown. (2 marks) ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ...............................................................................................................................

SPARE DIAGRAM (if required)

0 1 2 3 4 5 6

Ioni

satio

n En

ergy

Ionisation Number

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0 1 2 3 4 5 6

Ioni

satio

n En

ergy

Ionisation Number

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Question 15 Why is calcium more reactive than magnesium, yet chlorine is more reactive than bromine? (3 marks) ................................................................................................................................................. ................................................................................................................................................. ................................................................................................................................................. ................................................................................................................................................. ................................................................................................................................................. ................................................................................................................................................. ................................................................................................................................................. ................................................................................................................................................. ................................................................................................................................................. Question 16 Consider the following chemical reactions represented in the flow chart below: (a) Complete the following table by naming the appropriate substance: (2 marks)

Substance Name Reagent 1

Reagent 2

Compound 1 Question 16 continues.

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CH3

CH3CHCH2OH

NaOH(aq)

NH3(g)

CH3

CH3CHCH2Br

CH3

CH3C = CH2

CH3

CH3CHCH2NH2

Reagent 1

Reagent 2

Compound 2

Compound 1

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Question 16 (continued) (b) Draw a structure to represent the addition polymer formed from Compound 2.

(1 mark) Question 17 Explain why benzene is represented as rather than alternating single and double bonds ie . (2 marks) ................................................................................................................................................. ................................................................................................................................................. ................................................................................................................................................. ................................................................................................................................................. .................................................................................................................................................

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Question 18 A Year 12 Chemistry student is preparing an ester made from butan-1-ol and ethanoic acid. The reaction does not proceed to completion. (a) Using structural formula, write a chemical equation to show the reaction occurring

between these two chemicals. As part of your answer indicate if any other chemicals are required and name the ester formed. (3 marks)

(i) other chemical(s) required, if any: ............................................................................................................................... ............................................................................................................................... (ii) name of ester formed: ............................................................................................................................... ...............................................................................................................................

(b) The instructions for the preparation include:

• After heating the mixture pour it into some water.

(i) The student notices that the mixture has separated into two layers, one of which

is an aqueous layer. Use bonding to explain why this separation occurs. As part of your answer indicate what organic compound(s) would be found in each layer. (3 marks)

............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... Organic compound(s) in aqueous layer: ...............................................................

Organic compound(s) in non-aqueous layer: ........................................................

Question 18 continues.

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Question 18 (continued) The instructions for the preparation continue:

• Pour the mixture into a small beaker containing a sodium carbonate solution, Na2CO3(aq). There will be some effervescence (fizzing).

(ii) Why is the mixture added to the sodium carbonate solution? Write a chemical

equation to support your answer. (2 marks) ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ...............................................................................................................................

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Question 19 Results from some chemical reactions and spectral analysis are used to identify three organic compounds – labelled compounds A, B and C. Initially the identity of compound A is investigated:

• Compound A has a neutral pH. • Compound A can be oxidised with acidified potassium permanganate solution. • Spectra of compound A:

(a) Use the information above to identify compound A. Give reasons for your answer.

(3 marks)

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(b) Compound B is an isomer of compound A. Draw the structural formula and name of

compound B. (1 mark)

Name of compound B: ................................................................................................... Question 19 continues.

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Question 19 (continued) The hydrocarbon compound C is a branched alkene containing one methyl side chain only. Some of the properties of compound C are: • Compound C reacts with steam to form two isomeric alcohols with molecular formula

C6H14O. Neither of these isomers was shown to be a primary alcohol. • When Compound C reacts with a suitable oxidiser, it splits into compounds A and B.

No other organic compounds are formed.

(c) Identify compound C, giving reasons for your answer. Draw the structural formula and name compound C as part of your answer. (3 marks)

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This question paper and any materials associated with this examination (including answer booklets, cover sheets, rough note

paper, or information sheets) remain the property of the Office of Tasmanian Assessment, Standards and Certification.