Any guys have T i k t o k on here

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

How many miles of water are produced if 5.43 mol pbo2 are consumed

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?