What are the diatomic molecules? - HOFBrINCl, Which law explains why reactions need to be balanced? - The law of conservation of mass, Which law explains why some reactions show a change in temp?  - The law of conservation of energy, How do you know a reaction of exothermic by a graph - if potential (chemical) energy is decreasing, How do you know if a reaction is endothermic? - If potential (chemical) energy is increasing, What is a combustion reaction? - When something reacts with oxygen to create water and carbon dioxide, What is a neutralization reaction? - when an acid and a base react to form water and a salt, What does pH measure? - The amount of hydrogen ions in the solution (more hydrogen ions= lower pH), what happens if an acid is added to a base? - The pH will decrease,

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