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Grade 12 Chemistry entrance exam, 2006 E.C. (2014)

Real questions from the Grade 12 university entrance exam in Chemistry, as students sat it in 2006 E.C. Every question comes with the correct answer and a worked explanation.

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  • Natural science stream

    Who sits it

  • 2006 E.C. (2014)

    Exam year

  • 73 questions with answers

    In this set

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Answer each question yourself before opening the answer. The explanations point to the exact place in the textbook, so you know which page to reread when you miss one.

Question 1

Which of the following is NOT a conjugate acid-base pair?

  1. A.HNO3/NO3−\mathrm{HNO_3/NO_3^-}
  2. B.H2SO4/HSO4−\mathrm{H_2SO_4/HSO_4^-}
  3. C.NH3/NH2−\mathrm{NH_3/NH_2^-}
  4. D.H3O+/OH−\mathrm{H_3O^+/OH^-}
Show the answer and explanation

Answer: D H3O+/OH−\mathrm{H_3O^+/OH^-}

Why

A conjugate acid-base pair must differ by exactly one proton (H+). H3O+ and OH- differ by two protons, as the conjugate base of H3O+ is H2O, and the conjugate base of H2O is OH-.

Question 2

Which of the following is correct?

  1. A.1L=1dm3\mathrm{1L=1dm^3}
  2. B.1L=10dm3\mathrm{1L=10dm^3}
  3. C.10L=1dm3\mathrm{10L=1dm^3}
  4. D.1L=1m3\mathrm{1L=1m^3}
Show the answer and explanation

Answer: A 1L=1dm3\mathrm{1L=1dm^3}

Why

By definition of metric units of volume, 1 liter (L) is exactly equal to 1 cubic decimeter (dm^3).

Question 3

Commercially, liquid vegetable oils are converted to solid fats such as margarine by:

  1. A.Hydrogenation
  2. B.Hydration
  3. C.Saponification
  4. D.Oxidation
Show the answer and explanation

Answer: A Hydrogenation

Why

Catalytic hydrogenation adds hydrogen across carbon-carbon double bonds in unsaturated liquid vegetable oils, raising their melting point to produce semi-solid or solid fats like margarine.

Question 4

What is the chemical name for Aspirin?

  1. A.Acetyl salicylic acid
  2. B.Salicylic acid
  3. C.Methyl salicylate
  4. D.Sodium salicylate
Show the answer and explanation

Answer: A Acetyl salicylic acid

Why

Aspirin is the common trade name for acetylsalicylic acid, which is synthesized by the acetylation of salicylic acid.

Question 5

Which of the following statement(s) is (are) true of an ideal liquid-liquid solution? I. It obeys PV = nRT II. It obeys Raoult's law III. Solute-solute, solvent-solvent, and solute-solvent interactions are very similar. IV. Solute-solute, solvent-solvent, and solute-solvent interactions are quite different.

  1. A.I, II and III
  2. B.I, II and IV
  3. C.II and III
  4. D.II and IV
Show the answer and explanation

Answer: C II and III

Why

An ideal solution obeys Raoult's law over all concentrations because the intermolecular forces between unlike molecules (solute-solvent) are identical in strength to those between like molecules (solute-solute and solvent-solvent). PV = nRT is the ideal gas law, not applicable to liquids.

Question 7

In a reaction, A + B →\rightarrow product, the rate is doubled when the concentration of B is doubled, and the rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled, the rate law for the reaction can be written as:

  1. A.Rate = K[A][B]
  2. B.Rate = K[A][B]2^2
  3. C.Rate = K[A]2^2[B]
  4. D.Rate = K[A]2^2[B]2^2
Show the answer and explanation

Answer: C Rate = K[A]2^2[B]

Why

Doubling [B] doubles the rate, meaning the reaction is first-order with respect to B. Doubling both [A] and [B] increases the rate by a factor of 8 (2^x × 2^1 = 8), which gives x = 2, so the rate law is Rate = k[A]^2[B].

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Chemistry papers from other years

2018 E.C. (2026)2017 E.C. (2025)2016 E.C. (2024)2015 E.C. (2023)2014 E.C. (2022)2013 E.C. (2021)2012 E.C. (2020)2011 E.C. (2019)2010 E.C. (2018)2009 E.C. (2017)2008 E.C. (2016)2007 E.C. (2015)2005 E.C. (2013)

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Are these the real 2006 E.C. Chemistry entrance exam questions?

Yes. They come from the national university entrance exam in Chemistry that students sat in 2006 E.C. (2014). Our set holds 73 of its questions, each with its answer and an explanation that points back to the textbook.

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Can I download the Chemistry 2006 E.C. paper as a PDF?

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