How is the climate in san francisco, california different from wichita, kansas

When will le chatelier's principle come into effect? at the beginning of a reaction, when there are only reactants when a reaction has reached chemical equilibrium when a catalyst is added to a reaction mixture when a reaction is occurring but not yet at equilibrium

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

Which statement best describes the flow of energy in this scenario