Energy that enters or leaves a system during a chemical reaction comes from A. the building and breaking of chemical bonds.
B. the conversion of mass to energy.
C. heat absorbed from the surroundings.
D. the kinetic energy of electron motion.

Which of the following pressures is equal to 760 mm hg? 2.0 atm 101.3 pa 101,300 kpa 101,300 pa

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

Which compound contain an iron with a 3+ charge