How much energy is required to heat 2kg of ice from -5°c to 0°c

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

what is the question here. i think you messed up.