Question

Explain why calcium metal after reaching with water starts floating on its surface . write the chemical equation for this reaction

Answer 1

It reacts rapidly with water that it comes in touch and forms calcium hydroxide and releases hydrogen ions. This is because Calcium is more reducing by giving out electrons more readily than hydrogen and more metallic. The hydrogen bubbles that come out of water stick to the surface of Calcium.

Ca + 2H2O -> Ca(OH)2 + H2

Answer 2

$\huge\underline{\tt{\orange{« Answer »}}}$

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

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

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

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