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Chemical change test with answers for grade 7 science (free PDF download)

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Quick answer: A physical change alters the shape, size or state of a material without making a new substance, while a chemical change makes new substances with different properties. This grade 7 science test on chemical change has 8 questions worth 20 marks, to do in 45 minutes: defining the changes, classify three changes and signs and boiling. The mark scheme is on a separate page; free printable PDF.

Chemical change test with answers for grade 7 science (free PDF download)

Also, this test checks the difference between physical and chemical changes, the signs of a reaction and word equations. Also, you have 45 minutes and 20 marks. Then, write full sentences for explanations and use the full names of substances in equations.

Level: Grade 7 science (Year 8 · Class 7) · Curriculum: MS-PS1-2

Time: 45 minutes · 8 questions · Total: 20 marks · Calculator allowed

Question 1 Defining the changes (2 marks)

  1. Define a physical change. (1 mark)
  2. In addition, define a chemical change. (1 mark)

Question 2 Classify three changes (3 marks)

Classify each change as physical or chemical.

  1. Afterwards, grinding pepper into powder. (1 mark)
  2. Toasting a slice of bread until it turns brown. (1 mark)
  3. In addition, wax melting in a warm room. (1 mark)

Question 3 Signs and boiling (2 marks)

  1. Moreover, state two signs that a chemical change may have happened. (1 mark)
  2. Explain why bubbles in boiling water are not a sign of a chemical change. (1 mark)

Question 4 Word equation (3 marks)

Sulfur burns in oxygen to make sulfur dioxide.

  1. Also, write the word equation. (2 marks)
  2. Then, state which substance is the product. (1 mark)

Question 5 Heating sugar (3 marks)

A student heats white sugar in a test tube, as shown.

A test tube with white sugar being heated by a flame; the sugar turns brown then black, water droplets collect on the cooler upper wall of the tube and a brown smoke with a burnt smell risesWater droplets on the cool upper wallBrown smoke, burnt smellBlack solid left at the bottomStart: white sugar crystalsAfter heating: black solidBunsen flame
Sugar heated in a test tube.
  1. Then, state two observations that show a chemical change. (2 marks)
  2. State whether the black solid can be turned back into sugar by cooling. (1 mark)

Question 6 Dissolving or burning (3 marks)

Explain why dissolving salt in water is a physical change but burning wood is a chemical change. (3 marks)

Question 7 Metals in acid (2 marks)

In addition, three metal strips are placed in dilute hydrochloric acid. Strip P fizzes and shrinks. Afterwards, strip Q shows no change. Moreover, strip R fizzes slowly.

  1. Moreover, state which strips undergo a chemical change. (1 mark)
  2. Explain your answer. (1 mark)

Question 8 A rusting nail (2 marks)

Ibrahim in Kano says that rusting is a physical change because the nail still looks like a nail. Explain why he is wrong. (2 marks)

See the chemical change test answers and mark scheme

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