Question

Explain why calcium metal after reacting with water starts floating on its surface. Write the chemical equation for the reaction. Name one more metal that starts floating after some time when immersed in water.

Answer 1

Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of metal.

Ca(s) + 2H2O(l)------> Ca(OH)2 + H2(g)

Magnesium reacts with hot water & starts floating due to the bubbles og hydrogen gas sticking to its surface.

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Answer 2

$\huge\underline{\tt{\blue{Answer ↓}}}$

ᴄᴀʟᴄɪᴜᴍ sᴛᴀʀᴛs ғʟᴏᴀᴛɪɴɢ ʙᴇᴄᴀᴜsᴇ ᴛʜᴇ ʙᴜʙʙʟᴇs ᴏғ ʜʏᴅʀᴏɢᴇɴ ɢᴀs ғᴏʀᴍᴇᴅ sᴛɪᴄᴋ ᴛᴏ ᴛʜᴇ sᴜʀғᴀᴄᴇ ᴏғ ᴍᴇᴛᴀʟ.

$\sf\pink{Ca(s) + 2H₂O(l) → Ca(OH)₂ + H₂(g)}$

ᴍᴀɢɴᴇsɪᴜᴍ ʀᴇᴀᴄᴛs ᴡɪᴛʜ ʜᴏᴛ ᴡᴀᴛᴇʀ ᴀɴᴅ sᴛᴀʀᴛs ғʟᴏᴀᴛɪɴɢ ᴅᴜᴇ ᴛᴏ ᴛʜᴇ ʙᴜʙʙʟᴇs ᴏғ ʜʏᴅʀᴏɢᴇɴ ɢᴀs sᴛɪᴄᴋɪɴɢ ᴛᴏ ɪᴛs sᴜʀғᴀᴄᴇ.

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