Which statement is true about ionic compounds?
they are made up of many large molecules that are bonded together.
they are made up of atoms of only one type of element.
they are made up of particles that are arranged in a repeating pattern.
they are made up of a random ratio of elements that are bonded together.

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.

Avariable that is not being directly tested during an experiment should be

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules