cho 27,2 gam phenyl axetat tác dụng với 500ml dung dịch NaOH 0,9M. Cô cạn dung dịch thu được m(g) chất rắn. Tính m

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

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?

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore