Where do oxidation and reduction half reactions take place in a voltaic cell? Which electrode loses mass and which gains mass when a voltaic cell is in operation?

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).

In an exothermic reaction at equilibrium, what is the effect of lowering the temperature? a. the reaction makes more products. b. the reaction makes more reactants. c. the reaction is unchanged.