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Grade 12 Chemistry entrance exam, 2016 E.C. (2024), Tigray

Real questions from the Grade 12 university entrance exam in Chemistry, as students sat it in 2016 E.C. Every question comes with the correct answer and a worked explanation. This is the paper sat in Tigray in 2016 E.C. The year's other papers are listed further down.

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  • Natural science stream

    Who sits it

  • 2016 E.C. (2024), Tigray

    Exam year

  • 71 questions with answers

    In this set

Try questions from this paper

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

The number of significant figures obtained by addition of 300.53 and 2.507 is:

  1. A.7
  2. B.5
  3. C.6
  4. D.4
Show the answer and explanation

Answer: B 5

Why

When adding numbers, the result must be rounded to the same number of decimal places as the measurement with the fewest decimal places. Adding 300.53 (two decimal places) and 2.507 (three decimal places) gives 303.037, which rounds to 303.04, containing 5 significant figures.

Question 2

Digits that make measurements certain plus one of uncertain values are known as _____.

  1. A.scientific notation
  2. B.decimal places
  3. C.significant figures
  4. D.conversion factors
Show the answer and explanation

Answer: C significant figures

Why

Significant figures are defined as the digits in a measured value that are known with certainty plus one final digit that is uncertain or estimated.

Question 3

Which one of the following is the CORRECT description of uncertainty in measurements? It is used that exact number is

  1. A.whose values are known exactly
  2. B.accurate number
  3. C.certain number
  4. D.whose values known inexactly
Show the answer and explanation

Answer: A whose values are known exactly

Why

Exact numbers are those whose values are known exactly, such as counted values (e.g., 12 eggs in a dozen) or defined quantities, and they have zero uncertainty.

Question 4

The spontaneous emission of high-energy radiation and particles is said to be:

  1. A.Radioisotope
  2. B.Radioactive decay
  3. C.Radioactivity
  4. D.Radioactive radiation
Show the answer and explanation

Answer: C Radioactivity

Why

Radioactivity is defined as the spontaneous emission of high-energy radiation and particles from unstable atomic nuclei.

Question 5

"Both the position and the momentum of an electron in atom cannot be determined at the same time", this is the statement of the:

  1. A.Bohr's theory
  2. B.de-Broglie's statement
  3. C.Planck's theory
  4. D.Heisenberg's uncertainty principle
Show the answer and explanation

Answer: D Heisenberg's uncertainty principle

Why

Heisenberg's uncertainty principle states that it is fundamentally impossible to determine simultaneously both the exact position and momentum of a subatomic particle like an electron.

Question 6

Which of the following is CORRECT according to Hund's rule?

  1. A.The lowest energy electron configuration for degenerate orbitals is the one with the maximum number of unpaired valence electrons
  2. B.No two electrons in a multi-electron atom have the same set of four quantum numbers; principal, secondary, magnetic and spin
  3. C.The most stable atomic structures are those in which the electrons are in the lowest energy orbitals available
  4. D.Electrons in an atom move in a circular orbits called stationary states and have a dual nature, particle and wave
Show the answer and explanation

Answer: A The lowest energy electron configuration for degenerate orbitals is the one with the maximum number of unpaired valence electrons

Why

According to Hund's rule, for degenerate orbitals, the lowest energy (most stable) electron configuration is the one with the maximum number of unpaired electrons with parallel spins.

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The other Chemistry papers of 2016 E.C.

2016 E.C. (2024)2016 E.C. model exam

Chemistry papers from other years

2018 E.C. (2026)2018 E.C. (2026), version 12018 E.C. (2026), version 22018 E.C. (2026), version 42017 E.C. (2025)2017 E.C. (2025), round 12017 E.C. (2025), version 22015 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)2006 E.C. (2014)2005 E.C. (2013)

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Are these the real 2016 E.C. Chemistry entrance exam questions?

Yes. They come from the national university entrance exam in Chemistry that students sat in 2016 E.C. (2024). 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 2016 E.C. paper as a PDF?

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