Which of these is the subject of study in thermodynamics A. energy changes
B. only physical changes
C. only chemical changes
D. structure of atoms and molecules

The fact that the total amount of energy in a system remains constant is a(n)

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.

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate