Component

Component: Chemical Monitoring and Management

Question 11

Question 11

Written Paper Section I Question 11 - 2002 HSC

Substance emitted in a higher level by a car engine burning fuel with insufficient air compared with an engine with a correct fuel to air ratio

Question 11

Question 11

Written Paper Section I Question 11 - 2001 HSC

Reason why chlorine is used to treat local water supplies

Question 12

Question 12

Written Paper Section I Question 12 - 2002 HSC

Most effective method for removing oxides of nitrogen produced by the combustion of coal

Question 12

Question 12

Written Paper Section I Question 12 - 2001 HSC

Purpose of the atomic absorption spectrophotometer

Question 13

Question 13

Written Paper Section I Question 13 - 2002 HSC

Major advantage of the development early in the 20th century of the Haber Process for producing ammonia

Question 13

Question 13

Written Paper Section I Question 13 - 2001 HSC

Likely reason for variation in results of a chemical analysis of a sample of fertiliser

Question 14

Question 14

Written Paper Section I Question 14 - 2002 HSC

Given a standard graph and an equation for the chemical process, select a graph correctly comparing the yield of ammonia at two different temperatures.

Question 14

Question 14

Written Paper Section I Question 14 - 2001 HSC

Most effective design for a microscopic membrane filter to purify contaminated water

Question 15

Question 15

Written Paper Section I Question 15 - 2002 HSC

Given a table of results of chemical tests for some cations and anions, select a conclusion consistent with a table of results when an unknown solution was tested.

Question 15

Question 15

Written Paper Section I Question 15 - 2001 HSC

Identification of results consistent with the presence of a cation in a solution

Student Responses (15)

Band 5/6 response 1 Band 5/6 response 2 Band 5/6 response 3 Band 4/5 response 1 Band 4/5 response 2 Band 4/5 response 3 Band 3/4 response 1 Band 3/4 response 2 Band 3/4 response 3 Band 2/3 response 1 Band 2/3 response 2 Band 2/3 response 3 Band 1/2 response 1 Band 1/2 response 2 Band 1/2 response 3

Question 22-24

Question 22-24

Written Paper Section I Question 22-24 - 2001 HSC

22. Justify the procedure used to prepare an ester in a school laboratory and include relevant chemical equations. 23(a) State Brönsted-Lowry's definition of a base. (b) Calculate the molar mass of a base in a household cleaning agent. 24(a) State a use of ammonia other than as a cleaning agent. (b) State the effect on the yield of the Haber Process when ammonia is liquefied. (c) Explain why it is essential to monitor temperature and pressure inside the reaction vessel when producing ammonia.

Student Responses (16)

Exemplary response 1 Band 5/6 response 1 Band 5/6 response 2 Band 5/6 response 3 Band 4/5 response 1 Band 4/5 response 2 Band 4/5 response 3 Band 3/4 response 1 Band 3/4 response 2 Band 3/4 response 3 Band 2/3 response 1 Band 2/3 response 2 Band 2/3 response 3 Band 1/2 response 1 Band 1/2 response 2 Band 1/2 response 3

Question 24

Question 24

Written Paper Section I Question 24 - 2002 HSC

Assess the impact of atomic absorption spectroscopy (AAS) on the scientific understanding of trace elements.

Student Responses (14)

Band 5/6 response 1 Band 5/6 response 2 Band 5/6 response 3 Band 4/5 response 1 Band 4/5 response 2 Band 4/5 response 3 Band 3/4 response 1 Band 3/4 response 2 Band 3/4 response 3 Band 2/3 response 1 Band 2/3 response 2 Band 2/3 response 3 Band 1/2 response 1 Band 1/2 response 2

Question 25

Question 25

Written Paper Section I Question 25 - 2010 HSC

Describe the relationship between dissolved oxygen and biochemical oxygen demand. Explain why it is important to monitor both in natural waterways.

Student Responses (16)

Exemplary response 1 Band 5/6 response 1 Band 5/6 response 2 Band 5/6 response 3 Band 4/5 response 1 Band 4/5 response 2 Band 4/5 response 3 Band 3/4 response 1 Band 3/4 response 2 Band 3/4 response 3 Band 2/3 response 1 Band 2/3 response 2 Band 2/3 response 3 Band 1/2 response 1 Band 1/2 response 2 Band 1/2 response 3

Question 25

Question 25

Written Paper Section I Question 25 - 2002 HSC

(a) Provide the systematic name of the CFC illustrated. (b) Identify the bonding within the ozone molecule, using a Lewis electron-dot diagram. (c) Discuss how CFCs damage the ozone layer, using relevant equations.

Student Responses (15)

Band 5/6 response 1 Band 5/6 response 2 Band 5/6 response 3 Band 4/5 response 1 Band 4/5 response 2 Band 4/5 response 3 Band 3/4 response 1 Band 3/4 response 2 Band 3/4 response 3 Band 2/3 response 1 Band 2/3 response 2 Band 2/3 response 3 Band 1/2 response 1 Band 1/2 response 2 Band 1/2 response 3

Question 25-27

Question 25-27

Written Paper Section I Question 25-27 - 2001 HSC

25. Explain the need for monitoring the products of a chemical reaction such as combustion. 26(a) Draw a graph using a fixed scale and data about lead concentrations. (b) Use the graph to interpret data. (c) State an hypothesis to account for variation in lead concentration observed. 27. Use a graph showing how ozone concentration changes with altitude to compare the environmental effects of the presence of ozone in the upper and lower atmosphere.

Student Responses (16)

Exemplary response 1 Band 5/6 response 1 Band 5/6 response 2 Band 5/6 response 3 Band 4/5 response 1 Band 4/5 response 2 Band 4/5 response 3 Band 3/4 response 1 Band 3/4 response 2 Band 3/4 response 3 Band 2/3 response 1 Band 2/3 response 2 Band 2/3 response 3 Band 1/2 response 1 Band 1/2 response 2 Band 1/2 response 3

Question 26

Question 26

Written Paper Section I Question 26 - 2002 HSC

(a) Describe a test to determine whether a given sample of water is 'hard' or 'soft'. (b) Given the concentration of magnesium carbonate in a sample of hard water, calculate the mass, in mg, of magnesium carbonate in 150mL of this sample.

Student Responses (16)

Exemplary response 1 Band 5/6 response 1 Band 5/6 response 2 Band 5/6 response 3 Band 4/5 response 1 Band 4/5 response 2 Band 4/5 response 3 Band 3/4 response 1 Band 3/4 response 2 Band 3/4 response 3 Band 2/3 response 1 Band 2/3 response 2 Band 2/3 response 3 Band 1/2 response 1 Band 1/2 response 2 Band 1/2 response 3

Question 27

Question 27

Written Paper Section I Question 27 - 2002 HSC

Describe the physical and chemical processes needed to purify and sanitise a town water supply.

Student Responses (14)

Band 5/6 response 1 Band 5/6 response 2 Band 5/6 response 3 Band 4/5 response 1 Band 4/5 response 2 Band 4/5 response 3 Band 3/4 response 1 Band 3/4 response 2 Band 2/3 response 1 Band 2/3 response 2 Band 2/3 response 3 Band 1/2 response 1 Band 1/2 response 2 Band 1/2 response 3

Question 29

Question 29

Written Paper Section I Question 29 - 2010 HSC

(a) Assumptions made in a flowchart of the process to determine the amount of sulfate in a sample of lawn fertiliser. Explain how the assumptions affect the validity of the process. (b) Using the percentage composition of sulphate in the sample, determine the mass of the dried precipitate produced.

Student Responses (15)

Band 5/6 response 1 Band 5/6 response 2 Band 5/6 response 3 Band 4/5 response 1 Band 4/5 response 2 Band 4/5 response 3 Band 3/4 response 1 Band 3/4 response 2 Band 3/4 response 3 Band 2/3 response 1 Band 2/3 response 2 Band 2/3 response 3 Band 1/2 response 1 Band 1/2 response 2 Band 1/2 response 3

Question 31

Question 31

Written Paper Section I Question 31 - 2010 HSC

(a) Calculate the percentage of total dissolved solids in a filtered sample of dam water. Describe a chemical test to determine the presence of chloride ions in the sample. (b) Name an ion other than chloride that commonly pollutes waterways. Identify its source and the effect of its presence on water quality.

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