Question
5. Give a few examples of chemical changes?
Answers
Bot
1. Digestion of food in human body
2. Burning of wood or coal
3. Rusting of iron
4. Cooking food
5. Baking a cake
6. Fermentation of grapes to make wine
7. Burning of gasoline in an engine
8. Photosynthesis in plants
9. Decomposition of organic matter
10. Electrolysis of water.
2. Burning of wood or coal
3. Rusting of iron
4. Cooking food
5. Baking a cake
6. Fermentation of grapes to make wine
7. Burning of gasoline in an engine
8. Photosynthesis in plants
9. Decomposition of organic matter
10. Electrolysis of water.
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Do you think a chemical and a physical change can happen at the same time? Why or why not?
Bot
Yes, a chemical and a physical change can happen at the same time. This is because during certain reactions, the substance undergoing change may experience both a chemical and physical change simultaneously. For example, when water freezes, a physical change occurs as its state changes from liquid to solid, but a chemical change also occurs as the individual water molecules arrange themselves into a crystalline structure with new physical and chemical properties. The occurrence of both changes simultaneously is not mutually exclusive and can happen together in some reactions.