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Do we need to know formulas for certain chemical compounds like Ammonium? One of the homework problems asked to draw a lewis structure with ammonium and another element but did not give you (NH4+). Will we need to know this for the midterm and if so which others should I memorize? I know he said to know H2O and CO2 but is ammonium included and which others?
I wouldn't go out of your way to memorize anything, personally. If you're expected to know it, it's because we have used it so many times and encountered it so repetitiously that it would be hard not to know it (like water, carbon dioxide, etc.) Plus, most questions usually give the formula.
most questions on the exams will give the chemical formula. however, if you would like to memorize some of the chemical formulas, there is a chart in the fundamentals section of the textbook of the main ones you should know.
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