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Question

An example of a chemical change is:
  1. formation of clouds
  2. glowing of an electric light
  3. dissolving of salt in water
  4. dropping sodium into water

A
formation of clouds
B
dropping sodium into water
C
glowing of an electric light
D
dissolving of salt in water
Solution
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Chemical changes involve chemical reactions and the creation of new products. Typically, a chemical change is irreversible.
Examples are:
  1. Dropping sodium into water
  2. combustion (burning) of wood
  3. metabolism of food in the body
  4. cooking an egg
  5. digesting sugar with the amylase in saliva
  6. baking a cake
  7. electroplating a metal
  8. explosion of fireworks
  9. rotting bananas
  10. grilling a hamburger
  11. milk going sour

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