Honors Chemistry Fall Exam Review

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How do you know if something is a strong acid or a weak acid (and bases) without looking at the chart? Do we need to know how for the exam?
-Hinnah
There are six strong acids. You either memorize them or look at the chart. All other acids are weak. The chart will be on the Table Page of the exam. Strong bases are the soluble hydroxides -- also on the chart.
-- Dr G


In a calculation, if the element is something like H2 the gas rather than just H, do you use the molar mass for H (1.008) or would you double it and say the molar mass of H2 is 2.016?
- Jada
1.008 g is the atomic mass of the element; 2.016 is the molar mass of the molecule. It's H2 (the gas) in a balanced equation, so the molar mass of H2 is 2.016g/mole just like any other "formula" in the equation. If you're finding the molar mass of a compound and it's the atom, then you use 1.008 g/mole. You use 1.008 g/mole H when going from mass data or mass percent to formula, because then it's the atom, not the molecule. Hope that helps.
-- Dr G