Clear zone — margin trimmed off after completion of assessment
Book of books used
Question and response book
Chemistry SEE
SEE 1
Time allowed
• Perusal time — 20 minutes
• Working time — 180 minutes
General instructions
• Answer all questions in this question and response book.
• Write using black or blue pen.
• QCAA-approved calculator permitted.
• QCAA formula and data book provided.
• Planning paper will not be marked.
Section 1 (20 marks)
• 3 short response questions
Section 2 (40 marks)
• 1 extended response question
External assessment 2021
of
LUI School code
School name
Given name/s
Family name
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Section 1
Instructions
• If you need more space for a response, use the additional pages at the back of this book.
– On the additional pages, write the question number you are responding to.
– Cancel any incorrect response by ruling a single diagonal line through your work.
– Write the page number of your alternative/additional response, i.e. See page … – If you do not do this, your original response will be marked.
• This section has three questions and is worth 20 marks.
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QUESTION 1 (7 marks)
Refer to Stimulus 1 in the stimulus book.
a) Calculate the concentration of ammonium hydroxide (NH4OH) in Cleaning solution A.
Show your working. [3 marks]
Concentration = mol L–1 (to three decimal places)
b) Determine which cleaning solution was used to collect the data for the titration curve.
Explain your reasoning. [2 marks]
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c) Use the data to identify if there is a relationship between ammonium hydroxide
concentration and pH. Consider the measurement uncertainty in your response. [2 marks]
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QUESTION 2 (8 marks)
Refer to Stimulus 2 in the stimulus book.
a) Determine which class of compound is least soluble in water. Justify your response. [2 marks]
b) Infer how chain length affects the boiling point and solubility of organic compounds.
Justify your response using evidence from the table. [4 marks]
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c) Predict the approximate boiling point of 1-hexanol. Justify your response. [2 marks]
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QUESTION 3 (5 marks)
Refer to Stimulus 3 in the stimulus book.
a) Sequence the metals from weakest to strongest reducing agent. [2 marks]
Weakest
Strongest 1.
2.
3.
4.
5.
6.
b) Determine the identity of Metal X. Justify your decision using two pieces of evidence
from the stimulus. [3 marks]
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Section 2
Instructions
• Respond in paragraphs consisting of full sentences.
• This section has one question and is worth 40 marks.
QUESTION 4 (40 marks)
Refer to Stimulus 4 in the stimulus book.
To investigate the claim that biodiesel produced from ethanol is ‘greener’ than biodiesel produced from methanol, a research question was developed.
Research question: How is the atom efficiency of biodiesel production affected by the type of alcohol (methanol or ethanol) used in the transesterification reaction?
a) Identify how the research question links to the claim. [3 marks]
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b) Analyse the data in Figures 1–5 to discuss how reaction time, alcohol-to-oil molar ratio, catalyst concentration and oil volume affect atom efficiency.
Use your findings to determine optimal reaction conditions for the methanol and
ethanol reactions. [24 marks]
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c) Draw a justified conclusion linked to the research question. Consider three limitations
of the evidence in your response. [5 marks]
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d) Use the findings from Questions 4b) and 4c) to evaluate the claim that biodiesel produced from ethanol is ‘greener’ than biodiesel produced from methanol.
Discuss the quality of evidence and suggest one way the investigation could be
extended to improve the evidence. [6 marks]
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e) Identify a new research question that is specific and relevant to the claim. [2 marks]
END OF PAPER
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ADDITIONAL PAGE FOR STUDENT RESPONSES
Write the question number you are responding to.Do not write outside this box.
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ADDITIONAL PAGE FOR STUDENT RESPONSES
Write the question number you are responding to.Do not write outside this box.
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ADDITIONAL PAGE FOR STUDENT RESPONSES
Write the question number you are responding to.Do not write outside this box.
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ADDITIONAL PAGE FOR STUDENT RESPONSES
Write the question number you are responding to.Clear zone — margin trimmed off after completion of assessment
© State of Queensland (QCAA) 2021
Licence: https://creativecommons.org/licenses/by/4.0 | Copyright notice: www.qcaa.qld.edu.au/copyright — lists the full terms and conditions, which specify certain exceptions to the licence.|
Attribution: © State of Queensland (QCAA) 2021
