A student observed that when sodium hydroxide was dissolved in water the temperature of the water increased what should the student conclude about the dissolving of sodium hydroxide?

Can someone me with 6 to 10 plz this is for masteries test.

In medium-sized stars such as the sun, nuclear fusion almost always means the fusing of nuclei to form , but larger stars can produce elements as heavy as

Acertain atom has 22 protons and 19 electrons. this atom loses an electron. the net charge on the atom is now 4+1+01-4-. if this same atom with 22 protons and 19 electrons were to gain 3 electrons, the net charge on the atom would be 3+2+02-3-.