Photosensitive chemicals, bahan fotopeka

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Photosensitive chemicals, bahan fotopeka

  1. 1. Molekul pewarna akan menyerap tenaga cahaya Warna pakaian akan menjadi pudar (fade)
  2. 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. 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. 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. 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. 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. 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

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