What is an advantage of batteries over mains power. What is an advantage of mains power over batteries

Describe the energy change involved in a chemical cell.

Explanation:

Batteries have a large advantage over other power sources by being ready to deliver on short notice – think of the quick action of the camera flash! There is no warm-up, as is the case with the internal combustion engine (ICE); battery power flows within a fraction of a second.

Batteries store energy reasonably well and for a long time. Primary batteries (non-rechargeable) hold more energy than secondary (rechargeable) and the self-discharge is lower. Lead-, nickel- and lithium-based batteries need periodic recharges to compensate for lost energy

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c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.