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Hi Joanne Kang 3I! I agree with Alvaro Chumpitaz 4D that you should put the states if they're known and given in the problem. Sometimes, the states are kind of ambiguous. However there are some reactions for which we should know the states. Take for example combustion reactions. We know that a hydrocarbon will react with Oxygen and that Oxygen exists on Earth as a diatomic element (meaning that gaseous Oxygen = O) and that the products are water vapor (HO) and carbon dioxide (CO)—both of which are gases. If the reaction gives its reactants and products without the states, then it would be safe to omit the physical states. I hope this helps!
Try to include the states of the reactants and products if they are known. Sometimes it is helpful when determining the solute and the solvent of a solution or to figure out what solute is produced by a chemical reaction. This will help you determine different properties of the reactants and products, such as solubility. It also helps you identify what type of reaction is occurring. If the problem gives you a chemical equation without the states of matter, then you most likely don't have to include them.
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