What happens in a hydrogen-oxygen fuel cell? A) Water is broken apart into hydrogen and oxygen. B) Hydrogen is oxidized and forms water. C) Oxygen gas is given off as a byproduct. D) Hydrogen gas is given off as a byproduct.

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy

Which is true concerning the products and reactants of photosynthesis and cellular respiration? a. the products of photosynthesis are sugars and the reactants of cellular respiration are starches. b. the products of photosynthesis are reactants in cellular respiration. c. oxygen is needed for photosynthesis and is given off in cellular respiration.

State the effect on the concentration of the clo- ion when there is a decrease in the concentration of the oh- ion