Physical and chemical changes – practice for Years 8–9

Sample questions on Physical and chemical changes 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

Chemical reactions

Question types: Physical or chemical change?

Sample questions

1. Question 1 Easy

   Which is a physical change (no new substance is made)?

   1. A) milk going sour
   2. B) natural gas burning
   3. C) grape juice fermenting
   4. D) silver tarnishing
   5. E) ice melting
   Show the solution

   Answer: E) ice melting

   How it works: milk going sour – chemical change; natural gas burning – chemical change; grape juice fermenting – chemical change; silver tarnishing – chemical change; ice melting – physical change

2. Question 2 Normal

   Which is a chemical change (a new substance is made)?

   1. A) grinding coffee
   2. B) sugar dissolving in water
   3. C) bending a wire
   4. D) wax setting
   5. E) natural gas burning
   Show the solution

   Answer: E) natural gas burning

   How it works: grinding coffee – physical change; sugar dissolving in water – physical change; bending a wire – physical change; wax setting – physical change; natural gas burning – chemical change

3. Question 3 Hard

   Which is a physical change (no new substance is made)?

   1. A) wood burning
   2. B) bending a wire
   3. C) baking bread
   4. D) silver tarnishing
   5. E) grape juice fermenting
   Show the solution

   Answer: B) bending a wire

   How it works: wood burning – chemical change; bending a wire – physical change; baking bread – chemical change; silver tarnishing – chemical change; grape juice fermenting – chemical change

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