Sound travels at a rate of 340 m/s in all directions through air. matt rings a very loud bell at one location, and steve hears it some time later at his location 450 meters to the south. how long did it take the sound to travel from the bell to steve's location?
0.76 s
1.3 s
150,000 s
790 s

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

Which position represents spring in the southern hemisphere? a) b) c) d)

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false