Calculate the specific heat capacity of a substance with a mass of 10 grams that absorbs 250 J of heat while changing temperature by 20 Celcius

Theoretically, which metal should be the most reactive? hydrogen lithium francium fluorine

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.

Why is the melting of ice a physical change ?