1. Solar energy
List the advantages and disadvantages of using solar energy

2. Advantages and disadvantages

3. Solar energy

4. Photosynthesis
An endothermic process in which green plants use light energy to produce stored chemical energy in the form of carbohydrates, such as glucose.

5. How does this happen?
What allows photosynthesis to take place is the green pigment chlorophyll that contains a system of alternating single and double bonds.

7. Why is chlorophyll green?
The resonance occurring within the molecule absorbs nearly all colors of visible light except green, which is reflected back.

8. It’s the resonance within conjugated structures that absorb light energy.
The green pigments of the chlorophyll molecule absorbs red and blue light, and reflects back green.
This is the energy that fuels the process of photosynthesis.

9. Question

10. Solution

13. Practice:

14. Practice:

15. Chromophore

22. Photosynthesis

23. Biofuels

24. Questions

25. Answers

26. Advantages of ethanol
What are the advantages and disadvantages of using ethanol as a fuel?

27. Advantages and disadvantages of using ethanol as a fuel

30. Biofuels

31. Biofuels
What are the advantages and disadvantages of using biofuels?

32. Biofuels

33. Vegetable oils

34. Transesterfication
The vegetable is reacted with ethanol or methanol in the presence of sodium hydroxide or a strong acid and a less viscous fuel is made