Do all energy transfers lead to a phase change

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

Which statement describes james chadwick’s discovery.

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.