If hydrogen gas and oxygen react with enough of heat they produce steam. a. Write the equation and balance if needed. b. If you have 250 g of steam, how many grams of hydrogen and oxygen were needed to react to produce this amount of steam?

27 drag each label to the correct location on the image. a particular exosolar system has five planets in total: a, b, c, d, and e. the table lists the orbital periods of these planets in days. planet orbital period (days) a 600 b 80 c 1,000 d 500 e 100 move each planet to its orbit in the system.