Explained how natural factors have changed the surface and atmosphere of the Earth over time?

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

What does the symbol (–hfus) indicate in a phase change?

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]