1. Molekul pewarna akan
menyerap tenaga cahaya
Warna pakaian akan
menjadi pudar (fade)

2. Perubahan Kimia yang Disebabkan
oleh Tenaga Cahaya
 Molekul yang terurai kepada bahan yang
lebih ringkas?
 This is what we called chemical changes.
 Other examples?
- plants?
- Photograph Films
- C:UsersCompaqDesktop4PMP5.7 &
5.8photosynthesis.rm

3. Photograph Films
 Containing coating made of photosensitive
material (bahan fotopeka)
- (Mengandungi salutan yang dibuat daripada
bahan fotopeka)
 Materials undergo chemical reactions when
exposed to light.
(bahan yang berlaku tindak balas kimia apabila
terdedah kepada cahaya)

4.  Examples photosensitive materials:
- Silver bromide (Argentum bromida)
Silver bromide Silver + bromin
C:UsersCompaqDesktop4PMP5.7 & 5.8Cool
Science- Silver Chloride Photochemistry.flv
Others:
1. Silver chloride
2. Silver Iodide

5. Photosensitive Chemicals
 Hydrogen peroxides
 Silver nitrates
 Silver chlorides
- Should be stored in opaque containers.
- WHY????
 light cannot pass through the container
No light penetration
To prevent chemical reactions inside container

6. Use energy wisely!
Gunakan tenaga dengan bijak!
 Jimat tenaga elektrik = jimat bahan api fosil.
 Energy saving = Save fossil fuels
 WHY should save fossil fuels?
- Limited, cannot be replaced and last longer
(Terhad, tidak boleh diganti dan akan tahan
lebih lama)
- Help preserve environment (membantu
mengekalkan alam sekitar)
 Also money saving

7. Battery
 Disposed in proper way.
 Help comfort you if using electronic device.
 Electronic device using battery makes you
more mobile.
 Smaller cell helps more smaller electronic
devices built such as
- Portable calculator
- Laptop
- Handphone