Which of the following is a correct formula unit of an ionic compound?
al203
ca20
mgoh
nacl2

List the two type of transporst that the cell in orde to transport molecules acroos the membrane

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

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?