How many QCAA Chemistry questions cover Properties and structure of organic materials?

AusGrader has 271 QCAA Chemistry questions on Properties and structure of organic materials, all with instant AI grading and detailed marking feedback.

QCAA (QCE) Chemistry — Properties and structure of organic materials Questions & Answers | AusGrader

Q7

2021

QCAA

Paper 1

1 mark

Q7

1 mark

Identify which molecule is an amide.

A

CH $_3$ CH $_2$ CN

B

CH $_3$ CH $_2$ NH $_2$

C

NH $_4$ CH $_3$ COO

D

CH $_3$ CONHCH $_3$

Q9

2024

QCAA

Paper 1

1 mark

Q9

1 mark

Polytetrafluorethene (PTFE) has a higher melting point than polypropene (PP) due to the

A

C–F bonds being non-reactive.

B

fluorine atoms forming stable C–F covalent bonds.

C

dispersion forces between closely packed fluorocarbon chains.

D

dipole–dipole interaction between fluorine and carbon atoms within the fluorocarbon chain.

Q21

2022

QCAA

Paper 1

4 marks

Q21a

2 marks

Identify whether 2-bromopropane is a saturated or unsaturated compound. Explain your reasoning.

2-bromopropane is saturated because it contains only single bonds.

Marking Criteria

Descriptor	Marks
Identifies 2-bromopropane is saturated	1
Indicates 2-bromopropane contains only single bonds	1

Q21b

2 marks

Determine whether 2-bromopropane is a primary, secondary or tertiary halogenoalkane. Explain your reasoning.

2-bromopropane is a secondary halogenoalkane, because the carbon that the bromine is attached to two carbon atoms.

Marking Criteria

Descriptor	Marks
Determines 2-bromopropane is a secondary halogenoalkane	1
Explains that the bromine (halogen) is bonded to a carbon that is attached to two other carbon atoms	1

Q25

2024

QCAA

Paper 1

3 marks

Q25

Maltose is a disaccharide formed when two monomers of $\alpha$ -glucose are joined.

Q25a

1 mark

Identify whether $\alpha$ -glucose is an aldose or ketose monosaccharide.

Descriptor	Marks
Identifies that glucose is an aldose monosaccharide	1

Q25b

2 marks

Distinguish between $\alpha$ -glucose and $\beta$ -glucose.

$\alpha$ -glucose has its OH group attached on the opposite side of the carbon ring (trans) to the CH $_2$ OH group, while $\beta$ -glucose has its OH group attached on the same side of the ring (cis) as the CH $_2$ OH group.

Marking Criteria

Descriptor	Marks
Identifies that $\alpha$ -glucose has its OH group and CH $_2$ OH group attached to opposite sides of ring (trans)	1
Identifies that $\beta$ -glucose has its OH group and CH $_2$ OH group attached on the same side of the ring (cis)	1

Q1

2023

QCAA

Paper 2

2 marks

Q1

2 marks

Polylactic acid (PLA) and low-density polyethylene (LDPE) are both used to produce plastic wrapping film.

Plastic	Composition	Density (g/cm $^3$ )	Tensile stress (MPa)	Elongation (%)	Degradation rate
PLA	plant-based	1.24	60	6	slow
LDPE	petrochemical-based	0.92	12	148	none

Analyse the data to discuss one advantage and one disadvantage of using PLA rather than LDPE to produce plastic wrapping film.

Advantage:

Disadvantage:

Advantage: An advantage is that PLA is plant based, therefore it uses (renewable) natural resources while LDPE is produced from non-renewable fossil fuels.
Disadvantage: PLA has less % elongation than LDPE, therefore PLA would stretch less.

Marking Criteria

Descriptor	Marks
identifies an advantage of using PLA using data	1
identifies a disadvantage of using PLA using data	1

QCAA Chemistry Properties and structure of organic materials

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