An early method of producing hydrogen gas was passing steam through red-hot iron pipes according to the reaction

3 fe (s) + 4 h2o (g) → fe3o4 (g) + 4 h2 (g)

how many liters of hydrogen gas at stp can be created by reacting 15.3 g of iron?

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

One similarity and one difference between an element and a mixture of elements

Match the following items. match the items in the left column to the items in the right column. 1. general or nonspecific observation best fit curve 2. educated guess quantitative 3. when two variables change in the same direction, one remaining larger than the other by the same factor theory 4. "measured" observation control 5. standard, reference data, or experiment qualitative 6. a presently accepted explanation of how something happens law 7. a statement that explains what something does under the same conditions hypothesis 8. a curve drawn to average the data's deviations direct relationship