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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
An example of a chemical change is:
  • A
    Formation of clouds
  • B
    Glowing of an electric light
  • ✓
    Dropping sodium into water
  • D
    Dissolving of salt in water
✓

Answer

Correct option: C.
Dropping sodium into water
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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