Question

Solid iodine , contaminated with salt was heated until the iodine sublimed.The violet vapour was then cooled to yield a pure solid. Solid iodine and zinc metal powder were mixed and ignited to give a white powder

Answer 1

Answer:

the iodine vaporising is a physical change i.e. solid>gas

then cooling to solid is another physical change i.e. gas>solid

since the iodine and salt were only mixed and not in a compound together there is no chemical change.

solid iodine and zinc powder mixed and ignited causes a chemical change because when something is ignited it reacts with oxygen and a new compund is formed.

Explanation:

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