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2001

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(c) Describe the Bohr model of the atom, and identify ONE merit and ONE 5

limitation of the model.

(d) (i) Name a transition element. 1

(ii) Outline a first-hand investigation to demonstrate the colour changes of a 2

named transition element as it changes in oxidation state.

(iii) Describe a safety risk associated with the procedure outlined in part (ii), 3

and suggest a safe work practice to minimise the risk.

(e) With reference to TWO pigments, explain how the metallic components produce 7

colour.

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2002

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2003

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2004

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(c) Assess the usefulness of distinguishing tests for carbohydrates and metal ions 7

used in the school laboratory, compared with technology used by forensic

chemists in laboratories, for the same purposes.

(d) During your practical work you performed a first-hand investigation to identify

the range of solvents that may be used for chromatography to separate and

identify mixtures.

(i) Define the term chromatography. 1

(ii) Outline the procedure used in your investigation, and describe the results 3

obtained.

(iii) Describe precautions used to prevent contamination of forensic samples, 4and explain why they are needed.

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2005

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2006

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2007

(e) You have performed a first-hand investigation to observe the flame colour of a

number of different cations.

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(i) Outline the procedure you used to identify the Sr2+ ion. 2

(ii) Identify a risk associated with this procedure. 1

(iii) Explain how the flame colour of the Sr

2+

ion relates to electron3

excitation and emission spectra.

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2008

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2009

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2010

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2011

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