Pure substances and mixtures – practice for Years 8–9

Sample questions on Pure substances and mixtures with the right answer and a worked solution, from easy to hard. In the Pickles Academy app a child gets new questions of the same kind every time, so they can't just learn the answers by heart.

Subject

Chemistry

Year

Years 8–9

Curriculum area

Mixtures

Question types: Pure substance or mixture?

Sample questions

1. Question 1 Easy

   Which of these is a pure substance?

   1. A) iron
   2. B) smoke
   3. C) granite
   4. D) salt solution
   5. E) vinegar
   Show the solution

   Answer: A) iron

   How it works: iron – pure substance; smoke – heterogeneous mixture; granite – heterogeneous mixture; salt solution – homogeneous mixture; vinegar – homogeneous mixture

2. Question 2 Normal

   Which of these is a heterogeneous mixture (with visible parts)?

   1. A) pure gold
   2. B) oxygen
   3. C) distilled water
   4. D) granite
   5. E) salt solution
   Show the solution

   Answer: D) granite

   How it works: pure gold – pure substance; oxygen – pure substance; distilled water – pure substance; granite – heterogeneous mixture; salt solution – homogeneous mixture

3. Question 3 Hard

   Which of these is a homogeneous mixture (the same throughout)?

   1. A) sand in water
   2. B) carbon dioxide
   3. C) sodium chloride
   4. D) salt solution
   5. E) sand with iron filings
   Show the solution

   Answer: D) salt solution

   How it works: sand in water – heterogeneous mixture; carbon dioxide – pure substance; sodium chloride – pure substance; salt solution – homogeneous mixture; sand with iron filings – heterogeneous mixture

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