Chemical reactions 4 ESO

Watch this films and answer the questions
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1. What examples of chemical reactions do you see in the video?
2. How does the rust reaction take place as explain by the candle?

In the second video

1. What does the scientist do with iron?
2. What is the cause for breathing, rust and Blood being red?
3. What does the balloon explode?
4. List several plenomena which May happen during a chemical reaction