1. Observe the changes in paper burning. After burning the paper, are there any changes in its colour and texture? Does the process produce new matter? 3 What changes produce new matter in everyday life?
Burning objects may cause burns and even fires. Do not burn things on your own!
1
2
after burning
After paper burns, it becomes ash, water vapour and some gases.
Quick Check Paper burning produces / does not produce new matter.
2. Observe the changes of the iron nail. Does rusting produce new matter?
1
2
rusty iron nail
normal iron nail
3. Compare the characteristics of the iron nails in pictures 1 and 2 in part 2. Answer these questions. (1) Observe: Are there any differences in their colours? Which one is shiny? Which one is smoother? Which one is rougher? Activity Booklet 27
How else can you compare the normal iron nail with the rusty iron nail?
(2)
Test with a magnet: Which one is attracted to a magnet more easily?
When iron rusts, it produces / does not produce new matter. There is a small / big difference between rusty iron and normal iron. Quick Check
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