Which of the following provides the best evidence that a chemical change is taking place? A. metal object becomes shorter when it is cooled. B. Steam rises from the surface of a liquid. C A liquid forms as a solid object melts. D. A flame burns on the surface of a solid.​

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) in an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

What is the value of keq for the reaction expressed in scientific notation?

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?