Karlheinz Brandenburg's work led to the invention of MP3 files. These files are now used to store music and
podcasts on digital devices such as computers and
smartphones
Which want or need was he most likely trying to meet when he developed this
wave technology?
O A Away to prevent the illegal recording and sharing of files over the
Internet
OBA way to make digital journalism interesting to a larger audience
C Away to make music files small enough to share easily over the
Internet
D A way to make museumstruments affordable to more people

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.

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules

Draw the lewis structure for the trisulfur s3 molecule. be sure to include all resonance structures that satisfy the octet rule.