A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution. Calculate the mass percent of KBr in the solution if the density is 1.12 g/mL.

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?

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas