What is the molality of a solution that has been prepared by mixing 52.1 g of sodium chloride with 479 g of water

List four observations that indicate that a chemical reaction may be taking place

Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?

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?