Ibuprofen, a well-known non-steroidal anti-inflammatory drug, has chirality. only the s enantiomer has anti-inflammatory activity (although the r enantiomer is converted slowly by the body into the s enantiomer). add wedge-and-dash bonds to complete the perspective structures of the two stereoisomers of ibuprofen.

b. atoms in metallic solids are not arranged in a regular pattern

explanation:

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.