CHAPTER 7.1 - COMPOSITION OF AIR SCIENCE DLP.pptx

science dlp form 1

1. 7.1 - COMPOSITION OF AIR Science KSSM Form 1 Chapter 7 : Air

2. LEARNING STANDARDS: 7.1.1 - Plan ways to determine and record the composition of air. Science KSSM Form 1 by #CikguEmyRoziana 7.1.2 - Synthesise the composition of air from a pie chart. 7.1.3 - Justify the importance of oxygen, nitrogen, carbon dioxide and inert gases in daily life. 7.1.4 - Appreciate the carbon cycle and the oxygen cycle in maintaining the composition of gases in the air. 7.1.5 - Solve problems when there is/are interferences to the oxygen and the carbon cycle.

3. Where is the air??

4. We can feel the air

5. atmosphere Layer of air = atmosphere Consist of many gases ( eg : nitrogen, oxygen, carbon dioxide, inert gas) Also contain dust, water vapour , microorganism AIR

6. What are the contents of air? Science KSSM Form 1 by #CikguEmyRoziana

7. BRAIN TEASER What is the relationship between the water vapour content in the air and formation of cloud and rain? Science KSSM Form 1 by #CikguEmyRoziana

8. Some sicknesses such as fever are caused by microorganisms in the air. Science Exploration Science KSSM Form 1 by #CikguEmyRoziana

9. Activity 7.1 Textbook Page 197 Science KSSM Form 1 by #CikguEmyRoziana

10. Activity 7.1 Textbook Page 197 Science KSSM Form 1 by #CikguEmyRoziana

11. EXPERIMENT: TO DETERMINE THE PERCENTAGE OF OXYGEN IN THE AIR 5 4 3 2 1 Water level increase to the level marked 1. It shows that composition of oxygen is 1/5 or 21% of the air.

12. The water rose to one fifth of the gas jar. One fifth of the air contains oxygen (about 20%). Only the oxygen in the air is used for burning candles. Results of Activity 7.1 Science KSSM Form 1 by #CikguEmyRoziana

13. Air is a mixture because the components can be separated by a physical method, which is fractional distillation. Is Air A Mixture? Science KSSM Form 1 by #CikguEmyRoziana

14. Fractional distillation is separation of a liquid mixture into fractions with different boiling points through boiling and condensation. Science Exploration Science KSSM Form 1 by #CikguEmyRoziana

15. 1. What gas is the most contained in the air? What percentage? Science KSSM Form 1 by #CikguEmyRoziana

16. 2. Why is air a mixture? Science KSSM Form 1 by #CikguEmyRoziana

17. Respiration Combustion of rocket engine at high altitudes Welding and steel cutting Preparation of various compounds Oxygen Science KSSM Form 1 by #CikguEmyRoziana The Importance of Gases in Daily Life

18. Photosynthesis Production of carbonated drinks Fire extinguisher Carbon cycle Carbon dioxide Science KSSM Form 1 by #CikguEmyRoziana The Importance of Gases in Daily Life

19. Production of nitric acid and ammonia Nitrogen cycle Liquid nitrogen as cooling agent Nitrogen Science KSSM Form 1 by #CikguEmyRoziana The Importance of Gases in Daily Life

20. Helium is used to fill hot air balloons and weather balloons Neon gas is used in advertising lights Argon gas is used in light bulbs Inert Gas Science KSSM Form 1 by #CikguEmyRoziana The Importance of Gases in Daily Life

21. Carbon Cycle Science KSSM Form 1 by #CikguEmyRoziana

22. Carbon Cycle Science KSSM Form 1 by #CikguEmyRoziana Carbon cycle is the cycle that maintains the content of carbon dioxide in the air by continuously taking carbon dioxide from the air and returning it to the air. Carbon cycle begins when green plants absorb carbon dioxide through photosynthesis. Animals that eat the plants obtain carbon elements from them. When the plants and animals die, they decompose. Decomposition caused by bacteria and fungi in the soil releases carbon dioxide. Burning of fossil fuels that contain carbon like coal and petrol also releases carbon dioxide. During respiration, all plants and animals release carbon dioxide. These processes such as decomposition, combustion and respiration are balanced by photosynthesis.

23. Oxygen Cycle Science KSSM Form 1 by #CikguEmyRoziana

24. Science KSSM Form 1 by #CikguEmyRoziana Oxygen cycle is a continuous cycle that takes oxygen from the air and returns it to the air. Oxygen needed in respiration, rusting, combustion and decomposition is obtained from photosynthesis. Oxygen Cycle

25. 3. State two importance of carbon dioxide gas in daily life. Science KSSM Form 1 by #CikguEmyRoziana

26. Activity 7.2 Textbook Page 202 Science KSSM Form 1 by #CikguEmyRoziana

27. Our environment is being destroyed by human activities such as logging and the uncontrolled usage of pesticides in agriculture. This will increase the amount of carbon dioxide which interferes with natural cycles including the oxygen and carbon cycles. Global warming and the greenhouse effect are among the consequences of this interference. Ways to Prevent Interferences in the Oxygen and Carbon Cycles Science KSSM Form 1 by #CikguEmyRoziana

28. Avoid using excessive pesticides Prohibit illegal logging Do not burn forests Prevent excessive release of smoke from vehicles Reforestation Ways to reduce problems of interferences to the oxygen and carbon cycle Science KSSM Form 1 by #CikguEmyRoziana

29. 4. Give two ways to prevent interference in the oxygen and carbon cycle. Science KSSM Form 1 by #CikguEmyRoziana

30. 1. List the composition of air. 2. How can you identify oxygen and carbon dioxide? 3. What is the importance of carbon dioxide to plants? 4. What are the effects of the increase of carbon dioxide in the air to humans? 5. As a student who appreciates the importance of the carbon and oxygen cycles, suggest ways to ensure a balance of carbon dioxide and oxygen content in the air. FORMATIVE PRACTICE 7.1 PAGE 272 Science KSSM Form 1 by #CikguEmyRoziana

31. SUMMARY : Science KSSM Form 1 by #CikguEmyRoziana 7.1.1 - Plan ways to determine and record the composition of air. 7.1.2 - Synthesise the composition of air from a pie chart. 7.1.3 - Justify the importance of oxygen, nitrogen, carbon dioxide and inert gases in daily life. 7.1.4 - Appreciate the carbon cycle and the oxygen cycle in maintaining the composition of gases in the air. 7.1.5 - Solve problems when there is/are interferences to the oxygen and the carbon cycle.

32. THAT'S ALL, THANK YOU Science KSSM Form 1 by #CikguEmyRoziana