chỉ dùng 1 thuốc thử, bằng phương pháp hóa học hãy nhận biết 4 dung dịch sau: k2so4, naoh, fecl3, h2so4

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?

In apex! a liquid heated beyond a certain temperature becomes

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?