Which of the following describe physical properties and which describe chemical properties of methane( principal component of gas) 1.) Methane is lighter (less dense) than air 2.)Methane has a higher fuel value(energy produced per gram) than any other fossil fuel 3.)Methane can be liquified for transport by shop if it cooled to 109K 4.)Liquified methane is over 300 times denser than methane gas at is boiling

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States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.