Question

When two atoms of different elements come in contact, heat is given off and light is produced. Which of the following does this support?
A. The law of definite proportions
B. The law of conservation of energy
C. Dalton's atomic theory
D. The law of conservation of matter

Answer 1

B. The law of conservation of energy

Answer 2

The correct answer is B. The law of conservation of energy. The energy was in them and when the reaction came the energy was changed form, which is what the law of conservation of energy is, energy can't be created or destroyed, just like matter, it just changes form.