Scientists made the following two observations about emission spectra Each Element has a unique emission spectrum
Atoms emit energy only at specific wavelengths
Describe how the Bohr model explains both of these obersavations

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?

What type of context clue you understand the meaning of  quandary?