How many grams of sodium metal are needed to generate 4. 00 l of hydrogen from water.

Compare and contrast physical changes with chemical changes.

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?

Acontrol during an experiment. might change remains constant does not exist does change