the international system of units (si) is a revision of the 1. system. there are 2. si base units. in si, the base unit of length is the 3.
the space taken up by a cube that is 10 cm on each edge is one 4. a measure of the pull of gravity on an object of given mass is its 5. the mass of one cubic centimeter of water at 4°c is one 6. scientists commonly use two equivalent units of temperature, the degree 7. and the the 9. and the 10. are common units of energy.

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.