Choose the correct statements.
a. the noble gases are very unstable.
b. in the world, elements are usually in their pure form.
c. eight electrons in the outer shell is the most stable configuration.
d. a chemical bond is a strong attractive force between atoms.

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

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.

How does the viscosity of magma change as magma cools?