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Grade 8 Chemistry model exam, 2012 E.C. (2020)

A model exam set in 2012 E.C. to prepare Grade 8 students for the Chemistry ministry exam, in the same format. It is practice, and it is not the ministry paper itself. Every question comes with the correct answer and a worked explanation.

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  • Every Grade 8 student

    Who sits it

  • 2012 E.C. model exam

    Exam year

  • 58 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 2

In Ethiopia caustic soda is manufactured in

  1. A.Addis Ababa
  2. B.Zeway
  3. C.Wenji
  4. D.Awash Melkasa
Show the answer and explanation

Answer: B Zeway

Why

In Ethiopia, caustic soda (sodium hydroxide) is produced industrially by the Caustic Soda Share Company located in Zeway (Ziway).

Question 3

Which properties of substance is measurable?

  1. A.color
  2. B.odor
  3. C.taste
  4. D.density
Show the answer and explanation

Answer: D density

Why

Density is a quantitative (measurable) physical property, whereas color, odor, and taste are qualitative properties.

Question 4

A chemical change is characterized by:-

  1. A.energy change is involved
  2. B.no change in composition
  3. C.no change in the mass of the substance is involved
  4. D.the change is easy to reverse
Show the answer and explanation

Answer: A energy change is involved

Why

A chemical change always involves an exchange of energy (either absorbed or released) and produces new substances with a change in composition.

Question 5

What is the formula name of CU2O\mathrm{CU_2O}?

  1. A.Copper (II) oxide
  2. B.copper peroxide
  3. C.Copper (I) oxide
  4. D.copper (III) oxide
Show the answer and explanation

Answer: C Copper (I) oxide

Why

In Cu2O\mathrm{Cu_2O}, oxygen has an oxidation state of -2, meaning each copper atom has an oxidation state of +1, which is named Copper (I) oxide.

Question 6

What does “X” represent in the following reaction? Al2O3+2NaOH→X+H2O\mathrm{Al_2O_3 + 2NaOH \rightarrow X + H_2O}

  1. A.Al(OH)3\mathrm{Al(OH)_3}
  2. B.AlH3\mathrm{AlH_3}
  3. C.Al2O3⋅H2O\mathrm{Al_2O_3 \cdot H_2O}
  4. D.NaAlO2\mathrm{NaAlO_2}
Show the answer and explanation

Answer: D NaAlO2\mathrm{NaAlO_2}

Why

When amphoteric aluminum oxide reacts with sodium hydroxide, it forms sodium aluminate and water: Al2O3+2NaOH→2NaAlO2+H2O\mathrm{Al_2O_3 + 2NaOH \rightarrow 2NaAlO_2 + H_2O}.

Question 7

Substances that take part in a chemical reaction is called?

  1. A.subscript
  2. B.products
  3. C.reactants
  4. D.None of the above
Show the answer and explanation

Answer: C reactants

Why

Reactants are the starting substances that enter into and take part in a chemical reaction to form products.

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Is this the real Grade 8 ministry exam?

No. It is a model exam set in 2012 E.C. (2020) to prepare students for the ministry exam, in the same format. Our set holds 58 of its questions, each with its answer and a worked explanation.

Where are the real ministry exam papers?

The Grade 8 ministry exam papers we hold are on the exam papers page, listed by year beside the model exams.

Can I download this model exam as a PDF?

Yes, and it is free. The question paper is one file and the answer key with its worked explanations is another, so you can try it first. Print them, or keep them on your phone for revision when there is no data.

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