Скачать или смотреть Exercise Investigative questions new book 9th chemistry chapter 5 Energetics

TEXT BOOK PAGE NUMBER: 82
Note: In this video the wordings are same as in the text book. Write Headings on your book. Notes are in description.
✍️ Exercise Investigative Questions

i. Why is it essential to cook some of the food items while others we can eat without cooking?
• Some foods contain harmful bacteria or toxic substances that are destroyed only by cooking, while others like fruits can be eaten raw as they are naturally safe and easily digestible.

ii. Why do fireworks look spectacular? What type of chemical compounds undergo chemical reactions during this activity?
• Fireworks produce colorful lights due to the combustion of metal salts like strontium (red), barium (green), and sodium (yellow). These undergo exothermic reactions producing heat, light, and sound.


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