You are not expected to know this material before hand. The questions are intended to help you focus on material in the lesson. After you have studied the lesson you should be able to answer these and even more complicated questions. Energy is needed to break covalent bonds. Energy is released when a covalent bond is formed.
All covalent bonds are the same strength.
Compounds with weak bonds react quickly. The heat of reaction is always positive for an exothermic reaction. The Law of Conservation of energy says the energy in the universe is constant. A spontaneous reaction is one that produces an explosion 8. Entropy, S, increases when disorder increases.