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Why do scientists use the International System of Units (SI)?

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

The arrangement of particles is most ordered in a sample of

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver