When a chemical reaction is at equilibrium,
the concentration of each reactant and the
concentration of each product must be
(1) constant
(2) variable
(3) equal
(4) zero

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

Which of the following is the best explanation why some reactions appear to stop before all the reactants are converted to products? the reaction goes to completion. the reaction reaches equilibrium and the products stop being formed. the reversible reaction occurs at the same rate. the limiting reactant prevents the forward reaction occurring.