Kitchen faucet? If so, the sprayer attaches to the underside of the faucet in the middle.
There is no hot water inlet in a water heater. There is a cold inlet and a hot outlet. Yes it can be connected to the hot outlet depending on the jurisdiction. Check the plumbing codes in your area to be sure.
Water can be hot or cold if you want
Clean the screen in the end of the spout.
Yes you often can. This topic has been written about here http://www.whitegoodshelp.co.uk/wordpress/can-you-connect-a-dishwasher-to-the-hot-water-supply/
HOT rises COLD sinks
Hot water is less denser than cold water and has a greater temperature.
Hot water is less denser than cold water and has a greater temperature.
Cold water
I think not because cold water is heaver than hot water and hot water rises to the top and cold drops to the bottom.
hot. it is cold when it condensates.
If you let hot water cool down, it will become cold water.
that happens because cold water is heavier than hot water.