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I'm not an expert in Chemistry but I think the changes involving in this Figure 4 are the steel changing into rust, and harmful gases changing into safer new gases for physical changes. Also, they are the steam from the exhaust condensating into a white cloud, the explosion of the gasoline air mixture producing hot exhaust gases for chemical changes.

Hope it helps a lot!

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Q: Which of the changes described in Figure 4 grade 9 science textbook page 30 involve chemical and physical changes?
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