Give reasons for the following.
1. A metal spoon is heated at one end and the heat is felt at the other end after a while.
2. The bottom of a cooking utensil is blackened while its inner part is made shining.
3. Two thin blankets layered together are warmer than one thick blanket.
4. Ice wrapped in a wire gauze placed in water does not melt even when the water boils.
5. Outer surface of the inner wall and inner surface of the outer wall of a thermos flask are silvered.
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