Methane is a gas that trap the sun's energy within the earth's atmosphere and is known as a a. greenhouse gas b. ozone gas c. unnatural gas d. gas produced by plants

Equal volumes of h2 and o2 are placed in a balloon and then ignited. assuming that the reaction goes to completion, which gas will remain in excess? 2h2 + o2 → 2h2o a. both are in equal proportion b. oxygen c. water d. hydrogen