Question

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answer please
also answer correct​

Answer 1

❁Required Answer:

$\fbox{ \underline \pink{i)boiling \: of \: water}}$

❁Explanation:

i) boiling of water

• Water can easily boiled. It changes only state not molecules when it becomes heat

ii) burining of woods

• burning of woods are chemical change and new substances are formed. for ex while we are buring the woods the ash will come.

iii) cooking an egg

• once if we boiled egg , it cannot come back to raw material. similarly , these subjstances are formed new with different properties.

iv) tarnishing silver

• once if we polised a spoon it cannot come back to original substances and it form a new substance.

Definition:

• when a substances can be revisible and not a new substances is physical change
• when a substances cannot be revisible and formed a new substances is chemical change