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Yes. It's important in future calculations and it's always good practice to begin doing it when it isn't necessary.
It doesn't affect the equation itself but it may be good to know so you can visualize the experiment and sometimes elements change states if you have multiple equations that are linked together. Also, as we learn more it may be important when we expand balancing equations into greater concepts that relate to states of matter, but it's not entirely necessary.
Like Jordan said, even if it won't affect the results of your chemical equation you should add them to get into the habit for future, more complex chemical reactions. It also helps me understand how the reactions are occurring and how the molecules interact.
If the problem doesn't directly tell you the states of the reactants or products, you can determine it based on the reaction knowing if the reaction occurs in an aqueous solution. Most products from reactions in aqueous solutions are also aqueous. If you know that one of the products is a precipitate from the precipitation reaction, it would be solid because precipitates are due to compounds being insoluble in water.
PranaviKolla3G wrote:Also, what are all the shorthand notations for the states of matter? (ex: for solids, it is (s))
For solids (s), Aqueous Solutions (aq), Liquids (l), and Gases (g)
In what instances would a molecule be liquid as opposed to aqueous? What are some examples of molecules besides water that are in the state of pure liquid and not aqueous?
Maya Beal Dis 1E wrote:In what instances would a molecule be liquid as opposed to aqueous? What are some examples of molecules besides water that are in the state of pure liquid and not aqueous?
An ionic compound will usually react in solution, so those are, for the most part, written as aqueous; NaCl, CuSO4, etc. Off the top of my head I can't recall any equations that use substances other than water in the liquid state, but some fuel reactions for rockets and such rely on liquid hydrogen and oxygen for propulsion. I think nitrogen has been used the same way as well, but don't quote me on that...
As far as I know, we won't work with many reactions like that, though. Reactions in aqueous solution seem to be much more prominent.
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