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Grade 12 Chemistry entrance exam, 2007 E.C. (2015)

Real questions from the Grade 12 university entrance exam in Chemistry, as students sat it in 2007 E.C. Every question comes with the correct answer and a worked explanation.

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  • Natural science stream

    Who sits it

  • 2007 E.C. (2015)

    Exam year

  • 71 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

According to valence bond theory. Which orbitals on bromine atoms overlap in the formation of the bond in Br2\mathrm{Br_2}?

  1. A.3s
  2. B.3P
  3. C.4s
  4. D.4P
Show the answer and explanation

Answer: D 4P

Why

Bromine has the valence electron configuration 4s² 4p⁵, so each bromine atom has one half-filled 4p orbital that overlaps with the other to form the single covalent bond in Br₂.

Question 2

The type of compound that is most likely to contain a covalent bond is one that is

  1. A.A solid metal
  2. B.Composed of only non-metals
  3. C.Composed of a metal from the far left and a non-metal from far right of the periodic table
  4. D.Held together by the electrostatic forces between oppositely charged ions.
Show the answer and explanation

Answer: B Composed of only non-metals

Why

Covalent bonds form primarily between non-metal atoms through the sharing of electron pairs, whereas bonds between metals and non-metals are typically ionic.

Question 3

The first step of the scientific method involves

  1. A.Forming a hypothesis
  2. B.Making observations.
  3. C.Performing an experiment.
  4. D.Predicting the result of an experiment
Show the answer and explanation

Answer: B Making observations.

Why

The scientific method typically begins with making observations about a phenomenon, which then leads to asking questions and formulating a hypothesis.

Question 4

The process of solute particles being surrounded by solvent particles is known as

  1. A.Saturation
  2. B.Agglomeration
  3. C.Solvation
  4. D.Dehydration
Show the answer and explanation

Answer: C Solvation

Why

Solvation is the process in which solute ions or molecules are surrounded and stabilized by solvent molecules (called hydration when the solvent is water).

Question 5

Which one of the following represents an acceptable possible set of quantum numbers (in the order n, l, mlm_l, msm_s) for an electron in an atom?

  1. A.2, 1, 0, 0
  2. B.2, 0, 2, +1/2
  3. C.2, 1, -1, 1/2
  4. D.2, 0, 1, -1/2
Show the answer and explanation

Answer: C 2, 1, -1, 1/2

Why

For n = 2, l can be 1, ml can range from -1 to +1 (so -1 is allowed), and ms can be +1/2. The other options violate quantum number rules: spin cannot be 0 (A), and when l = 0, ml must be 0 (B and D).

Question 6

Of the three types of radioactivity characterized by Rutherford, which of the following are particles?

  1. A.γ\gamma - rays
  2. B.β\beta - rays
  3. C.α\alpha - rays and β\beta - rays
  4. D.α\alpha - rays, β\beta - rays, and γ\gamma - rays
Show the answer and explanation

Answer: C α\alpha - rays and β\beta - rays

Why

Alpha rays (helium-4 nuclei) and beta rays (high-speed electrons) are particle radiation, whereas gamma rays are high-energy electromagnetic waves.

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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)2006 E.C. (2014)2005 E.C. (2013)

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Are these the real 2007 E.C. Chemistry entrance exam questions?

Yes. They come from the national university entrance exam in Chemistry that students sat in 2007 E.C. (2015). Our set holds 71 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 2007 E.C. paper as a PDF?

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