When water solidifies to ice, then heat is ___.
Removed
Absorbed
Unchanged
First removed, then absorbed
When water solidifies to ice, then heat is evolved.
When a mixture of iron powder and sulphur powder is heated strongly to form iron sulphide, then heat energy is :
(a) released (b) first absorbed and then released
(c) absorbed (d) neither absorbed nor released
When water at 0∘C freezes to form ice at the same temperature of 0∘C, then it :
(a) absorbs some heat (b) releases some heat
(c) neither absorbs nor releases heat (d) absorbs exactly 3.34×105 J/Kg of heat
Why does ice at 00C have a better cooling effect than water at 00C?