In the following pair, determine whether the two represent resonance contributors of a single species or depict different substances. If two structures are not resonance contributors, explain why? a. N¨−N≡N: and N¨=N=N:N¨=N=N: 
b. N¨−N≡N:N¨−N≡N: and N¨−N=N¨N¨−N=N ¨ 
c. N¨−N≡N:N¨−N≡N: and N¨−N¨−N¨N¨−N¨ −N¨

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

Give the set of reactants (including an alkyl halide and a nucleophile) that could be used to synthesize the following ether: draw the molecules on the canvas by choosing buttons from the tools (for bonds and charges), atoms, and templates toolbars, including charges where needed. ch3ch2och2ch2chch3 | ch3

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg