Answer:
The electron cloud is mostly empty space
Answer:
Electric switch is commonly known as the key of an electric circuit.
Most reactions are exothemic. If the forward reaction of an equilibrium reaction is exothemic then the reverse reaction must be endothermic.
If a system in equilibrium is heated, it will move in exothermic direction to give out heat energy.
The earth all the way around is 196.9 million miles
