2. Given below are a number of changes. Identify each of them as physical or chemical change.
a) When a whisked egg is heated, it scrambles.
b) When a candle is lit, the wax melts.
c) When a piece of coal is burnt, it turns to ash.
d) When jelly cubes are heated, they melt.
e) When wood is kept in contact with water for a long time, it rots.
f) When the sun shines on a puddle of water, the water evaporates.
Answers
Answer:
a chemical change
b physical changes
c chemical change
d physical change
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Answer:
Explanation:
a)A scrambled egg before heat is applied is still a raw egg, the white and yolk are just interspersed. That's a physical change.
b)On heating, candle wax gets melted. Since it again turns into solid wax on cooling. So, the melting of wax and vapourisation of melted wax are physical changes.
c)Burning of coal is a chemical change. When coal is burnt, the chief component, carbon is changed to carbon dioxide. This process cannot be reversed.
d)The melted ice cube may be refrozen, so melting is a reversible physical change.
e)when wood come in contact with water for a long time it rot.it is chemical change.
f)The evaporation of water is a physical change. When water evaporates, it changes from the liquid state to the gas state, but it is still water; it has not changed into any other substance.