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I don't know how the reaction is impacted, but my TA said that you should get in the habit of doing it because it'll be important in the future. So, I'm assuming that it's important to do on tests as well.
I asked this question in a Step up session today and the UA told me that in most problems where we have to write chemical equations, the state will be explicitly given. But if it is not just try your best to guess because it may be worth a very small amount of points
The state will usually be given to you in the problem (ex: 25ml of precipitate means solid, NaOH dissolved in water means aqueous). When we do acids/bases and solubility equilibria especially, you'll become familiar with which compounds dissociate in water (nitrates, acetates, compounds with group 1 elements, sulfates, etc.) and which don't (most carbonates and phosphates, etc), so that'll help you distinguish between the states better. For now, just use what's given in the problem.
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