Which of the following are not single-displacement reactions?
A. Fe (s) + 2HCl (aq) -> FeCl2 (aq) + H2 (g)
B. Na2S (aq) + 2HCl (aq) -> 2NaCl (aq) + H2S (g)
C. KOH (aq) + HNO3 (aq) -> H20 (l) + KNO3 (aq)
D. Ca (s) + 2H2O (l) -> Ca(OH)2 (aq) + H2 (g)

Sugar is dissolved in water. which is the solute? sugar neither both water

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?

Light waves can move through , but they travel fastest when they move through a(n) .