HSC Chemistry practice questions by module

Original questions for every module, with worked explanations and feedback on written answers.

Section I style	Multiple choice, worked or timed
Section II style	Short answers on a stimulus
Written answers	Read against the mark points, with your next step

Try 4 questions

Question 1

The graph shows the rates of the forward and reverse reactions for a reaction started with only reactants in a sealed flask at constant temperature. Which statement is true at 8 minutes?

Question 2

Three indicators: methyl orange changes from red to yellow between pH 3.1 and 4.4; bromothymol blue changes from yellow to blue between pH 6.0 and 7.6; phenolphthalein changes from colourless to pink between pH 8.3 and 10.0.
Indicator	pH range of colour change	Colour change as pH rises
methyl orange	3.1 to 4.4	red to yellow
bromothymol blue	6.0 to 7.6	yellow to blue
phenolphthalein	8.3 to 10.0	colourless to pink

Ethanoic acid is titrated with sodium hydroxide solution, and the equivalence point is at pH 8.7. Using the table, which indicator gives the most accurate end point?

Question 3

Solubility of four alcohols in water at 20 °C
Alcohol	Solubility (g per 100 g water)
methanol	mixes in all proportions
butan-1-ol	7.4
hexan-1-ol	0.59
octan-1-ol	0.054

The table shows the solubility of four alcohols in water at 20 °C. Which statement best explains the trend?

Question 4

Results of two tests on liquids X, Y and Z
Liquid	Bromine water	Acidified potassium dichromate
X	decolourised	stays orange
Y	stays orange-brown	turns green
Z	stays orange-brown	stays orange

Liquids X, Y and Z are hexane, hex-1-ene and hexan-1-ol, in some order. The table shows the results of two tests done at room temperature in the dark. Which identification is correct?

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Questions people ask

Are past HSC papers still useful?

Yes, for timing and question style: papers from 2019 on are set on the syllabus examined up to the 2028 HSC.