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When water bo...

Question

When water boils, its molecules start moving faster and many of them escape from water. Is boiling a chemical or a physical change?

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Solution

Boiling of water is a physical change because in boiling only the form of water is changed.
It changes from liquid to gaseous state.

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Q. Question 1 (d)
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d. Boiling of water to form steam

Classify the following as a physical or a chemical change :

(a) Drying of wet clothes

(b) Manufacture of salt from seawater.

(c) Butter getting rancid

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Q. State whether the following statements are true or false. Rewrite the false ones correctly.
(a) All irreversible changes are chemical changes.
(b) A liquid can sublime.
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(d) The melting of ice is a physical change.
(e) The souring of milk is a periodic change.
(f) The flowering of trees is a periodic change.
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(h) The breaking of glass tumbler is a chemical change because it is irreversible.
(i) Boiling, evaporation and condensation are physical changes.

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