Which of the following shows an exothermic reaction? O 2H2 + O2 + 2H20
O 2Na + Cl2 - 2NaCl + energy
O 2H20 + energy – 2H2 + O2
O 6CO2 + 6H20 + energy -C6H12O6 + 602

answer plsss

Which statement best describes the flow of energy in this scenario

Ineed ! i have no clue how to do this problem.

How many liters of ethylene glycol antifreeze (c2h6o2), with a density of 1.100 g/l, would you add to your car radiator containing 15.0 kg of water if you needed to protect your engine to - 21.5°c? for water, kf = 1.86°c m -1.