1 molar Hydrochloric acid has a theoretical (actual is pretty close too) of 0. The pH is defined as the negative logarithim to base 10 of the Hydrogen ion concentration.
So - log10[1] = 0
Battery acid being stronger than that has a pH of zero (actually slightly negative).
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When a substance changes from a liquid to a gas energy is absorbed. When a substance changes from a gas to a liquid energy is released.
Helium gas is a pure substance because it is made up of only one type of atom, specifically helium atoms.
It depends on what substance the gas is.
If the gas in the test tube is hydrogen, the substance inside would be hydrogen gas since the gas in the tube is hydrogen itself.
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