How many NESA Chemistry questions cover Conducting Investigations?

AusGrader has 4 NESA Chemistry questions on Conducting Investigations, all with instant AI grading and detailed marking feedback.

NESA (HSC) Chemistry — Conducting Investigations Questions & Answers | AusGrader

Q30

Phosgene is used in industry as a starting material to synthesise useful polymers. Phosgene ( $\text{Cl}_2\text{CO}$ ) is a gas at room temperature and is highly toxic.

Q30a

2 marks

Justify a suitable precaution when using phosgene.

Phosgene is dangerous to the environment because it is toxic. Therefore, it is important to ensure it does not leak from the reaction vessel, which requires constant monitoring.

Marking Criteria

Descriptor	Marks
Justifies a named precaution	2
Provides any relevant information	1
None of the above	0

Q30b

3 marks

Phosgene is synthesised by the reaction of carbon monoxide (CO) and chlorine ( $\text{Cl}_2$ ) in the gas phase.

\text{Cl}_2(g) + \text{CO}(g) \rightleftharpoons \text{Cl}_2\text{CO}(g)

Explain why an excess of carbon monoxide and a catalyst are used in the industrial synthesis of phosgene.

The use of a catalyst saves time and money because it increases the rate of reaction by lowering the activation energy. The use of a large excess of CO causes the equilibrium to shift to the products side, therefore improving the yield of phosgene.

Marking Criteria

Descriptor	Marks
Explains the use of a catalyst AND Explains the use of a large excess of CO	3
Describes how BOTH features affect the reaction but does NOT link cause and effect OR Explains how one feature affects the reaction	2
Provides any relevant information	1
None of the above	0

NESA Chemistry Conducting Investigations

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