Page 9 - Big Ideas Year 10 sciPAD 2025

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SCIPAD - BIG IDEAS - BOOK 2
NATURE OF THE ATOM
(g) A plant growing is a

change because 




(j) Metal rusting is a

change because 




(h) BBQ’ing a sausage is a

change because 




(k) Cheese melting is a

change because 




(i) A snowflake forming is a

change because 




(l) Baking a muffin is a

change because 




2. Zinc oxide is a white powder that when heated turns into a yellow powder without melting.
If you weigh a sample of white zinc oxide, then heat it until it turns yellow and weigh it
again, you will find it has exactly the same mass. When the yellow zinc oxide is allowed to
cool down, it turns back into a white powder.
(a) Outline whether this is an example of a physical change or a chemical change.

(b) Justify your answer to (a) by explaining why you think it is a physical or chemical
change. 






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