Which of the following do food chemists determine using thermochemistry?

A) the energy release during photosynthesis
B) how certain bacteria harness solar energy
C) the energy content of food
D) the energetics of living organisms
D)

Element before carbon on the periodic table

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.

What four properties do all waves have in common