Which example does not involve knowledge of chemistry? a. a firefighter working to put out a fire b. a photographer developing color film c. an astronomer identifying the stars of a constellation d. a medical student learning how drugs work

The biosphere of the earth is made up of . a. inorganic b. organic

Benzonitrile (c6h5cn) is reduced to two different products depending on the reducing agent used. treatment with lithium aluminum hydride followed by water forms k, which has a molecular ion in its mass spectrum at 107 and the following ir absorptions: 3373, 3290, 3062, 2920, and 1600 cm-1. treatment with a milder reducing agent forms l, which has a molecular ion in its mass spectrum at 106 and the following ir absorptions: 3086, 2850, 2820, 2736, 1703, and 1600 cm-1. l shows fragments in its mass spectrum at m/z = 105 and 77. propose structures for k and l and choose an explanation for how this could be concluded.

How many moles of sulfur dioxide are in 2.26 × 10^33 sulfur dioxide molecules?