Question

Give reasons why the following are considered as physical changes.
1. An iron is magnetized.
2. Butter is melted.
3. A fruit is dried.
4. Iron expands on heatin
5. Carbon dioxide is liquefied to give liquid carbon dioxide.​

Answer 1

Answer:

These all are considered a physical change as , in all of these there physical properties are same, we can reverse the process for ex = we can freeze melted butter.

Answer 2

Answer:

1ꜱᴛ ᴀɴꜱᴡᴇʀ- Magnetization of iron is a physical change because its chemical properties remain same, no new substances are formed and this is a reversible ᴄʜᴀɴɢᴇ

2ɴᴅ ᴀɴꜱᴡᴇʀ- Thus, melting of butter is a reversible process. No change in the chemical composition occurs when it is melted. Thus, melting of butter is a physical process because the physical appearance of the butter changes, the change is visible to eyes, the change can be reversed and no chemical change occurs.

3ʀᴅ The drying of fruits means water will be evaporated from it. Therefore it is a physical change. Any change that occurs without altering the chemical composition is called a physical change.

4ᴛʜ. Expansion and contraction of aetal on heating and cooling are physical changes because the expansion and contraction does not causes any chemical changes in a metal and also contraction and expansion does not produces any other element with different chemical properties.

5ᴛʜ- ɪ ᴅᴏɴᴛ ᴋɴᴏᴡ