How many NESA Chemistry questions cover Nomenclature?

AusGrader has 58 NESA Chemistry questions on Nomenclature, all with instant AI grading and detailed marking feedback.

NESA Chemistry Nomenclature

5 sample questions with marking guides and sample answers · Avg. score: 55%

2023

NESA

1 mark

How many structural isomers have the molecular formula $\text{C}_3\text{H}_6\text{F}_2$ ?

2021

QCAA

Paper 1

1 mark

Identify which molecule is an amide.

CH $_3$ CH $_2$ CN

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

NH $_4$ CH $_3$ COO

CH $_3$ CONHCH $_3$

Q21

2025

NESA

2 marks

Q21

2 marks

Consider the following organic reaction.

$\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_3 + \text{Br}_2 \xrightarrow{\text{Reaction condition X}} \text{CH}_3\text{CH}_2\text{CHBrCH}_3 + \text{HBr}$

In the space provided, identify reaction condition X and name the organic product.

Reaction condition X	IUPAC name of organic product

Reaction condition X	IUPAC name of organic product
UV light	2-bromobutane

Marking Criteria

Descriptor	Marks
Correctly identifies both the reaction condition AND product	2
Correctly identifies either the reaction condition OR product	1
None of the above	0

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

2020

QCAA

Paper 2

17 marks

Compound A reacts with water to produce compound B and hydroxide ions.

$CH_3CH_2NH_2(aq) + H_2O(l) \rightleftharpoons C_2H_5NH_3^+(aq) + OH^-(aq)$
A B

Q5a

1 mark

Apply IUPAC rules to name compound A.

Descriptor	Marks
provides ethanamine	1

Q5b

2 marks

Identify the Brønsted-Lowry acids in the equation.

Descriptor	Marks
provides H $_2$ O(l)	1
provides C $_2$ H $_5$ NH $_3^+$ (aq)	1

Q5c

3 marks

A small amount of hydrochloric acid is added to the equilibrium mixture. Predict the effect of this on the concentration of compound A in the mixture. Explain your reasoning.

The hydrochloric acid (H $^+$ ) reacts with the OH $^-$ ions and decreases their concentration.
According to Le Ch telier’s principle, this will make the equilibrium position shift to the right to counteract decrease in OH $^-$ (products).
Therefore, the concentration of A will decrease.

Marking Criteria

Descriptor	Marks
indicates that [OH $^-$ ] will decrease	1
indicates that the equilibrium will shift right	1
indicates that A will decrease	1

Q5d

6 marks

Calculate the pH of a 2.0 M solution of compound A. State any assumptions. Show your working. ( $K_b = 5.6 \times 10^{-4}$ )
pH = ____ (to one decimal place)

[CH $_3$ CH $_2$ NH $_2$ ] = 2.0 - x $\approx$ 2.0 as 2.0 $\gg$ $K_b$

Let x = [C $_2$ H $_5$ NH $_3^+$ ] = [OH $^-$ ]

$K_b = \frac{[C_2H_5NH_3^+][OH^-]}{[CH_3CH_2NH_2]}$
$5.6 \times 10^{-4} = \frac{[x][x]}{[2.0]} = \frac{x^2}{2.0}$
$x^2 = 1.12 \times 10^{-3}$

x = 0.033466 = [OH $^-$ ]

pOH = -log [OH $^-$ ] = 1.475 $\approx$ 1.5

pH = 14 - 1.5 = 12.5
pH = 12.5 (to 1 decimal place)

Marking Criteria

Descriptor	Marks
indicates assumption to support [CH $_3$ CH $_2$ NH $_2$ ] $\approx$ 2.0	1
indicates [C $_2$ H $_5$ NH $_3^+$ ] = [OH $^-$ ]	1
shows substitution correctly performed	1
determines [OH $^-$ ] = 3.35 $\times$ 10 $^{-2}$	1
determines pOH	1
determines pH	1

Q5e

5 marks

Describe, using a balanced chemical equation, how Compound A could be made from bromomethane. Include relevant conditions and reagents in your response.

Heat CH $_3$ Br with KCN under reflux to produce CH $_3$ CN and KBr

CH $_3$ CN(aq) + 2H $_2$ (g) $\xrightarrow{\text{heat with Ni catalyst}}$ CH $_3$ CH $_2$ NH $_2$ (aq)

Marking Criteria

Descriptor	Marks
indicates CH $_3$ Br reacts with KCN to produce CH $_3$ CN and KBr	1
identifies reaction is heated under reflux in ethanol	1
indicates CH $_3$ CN reacts with H $_2$ (g) to produce CH $_3$ CH $_2$ NH $_2$	1
indicates heat and Ni/Pt/Pd catalyst required	1
represents one of the reactions as a balanced chemical equation	1

NESA Chemistry Nomenclature

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