When two atoms of 2h (deuterium) are fused to form one atom of 4he (helium), the total energy evolved is 3.83 × 10-12 joules. what is the total change in mass (in kilograms) for this reaction?

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water

Which substance—wood or silver—is the better thermal conductor? a thermal conductor is a material that requires very little heat energy to change its temperature. explain your answer.

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!