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Changes Around Us Book Back Questions & Answers, Exercises, Solutions, Tests, Quizzes, Videos and Podcasts for Class 8 | Unit 5 | Chemistry | Science | Samacheer Kalvi – English Medium

8th Standard Samacheer Kalvi Chemistry New Book Back Questions & Answers: https://www.thelearning.app/samacheer-kalvi-english-medium/class-8/science-3/changes-around-us/exercises

Podcasts: https://www.thelearning.app/samacheer-kalvi-english-medium/class-8/science-3/changes-around-us/videos

Tests & Quizzes: https://www.thelearning.app/samacheer-kalvi-english-medium/class-8/science-3/changes-around-us/tests

Flash Cards: https://www.thelearning.app/samacheer-kalvi-english-medium/class-8/science-3/changes-around-us/flashcards

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00:00 Introduction
00:16 Fill in the blanks
04:25 True or false
05:38 Match the following
07:22 Match the following

Questions answered in this video –

1. Reactants ______.

2. Photosynthesis is a chemical reaction that takes place in presence of ______.

3. Iron objects undergo rusting when exposed to ______ and ______.

4. ______ is the basic material to manufacture urea.

5. Electrolysis of Brine solution gives ______ gases.

6. ______ is a chemical substance which alters the speed of a chemical reaction.

7. ______ is the enzyme responsible for browning of vegetables, fruits.

8. A chemical reaction is a temporary reaction

9. Change in colour may take place during a chemical reaction.

10. Formation of slaked lime from quicklime is a endothermic reaction.

11. CFC is a pollutant.

12. Browning of some vegetables and fruits is due to tannin formation.

13. Rusting

14. Electrolysis

15. Thermolysis

16. food

17. Catalysis

18. Rancidity

19. Ozone

20. Tarnishing

21. Yeast

22. Calcium Oxide

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