atar_2025 it depends on the type of reaction, but generally there are the following rules:
For thermochemical equations, the state of the reactant being combusted in excess o2 is specified on page 10 of the data book, water is a liquid, and O2 and CO2 are gases
For combustion reactions, the state of the substance being combusted in excess o2 is specified on page 10 of the data, book and water, O2 and CO2 are gases
If a substance is in solution with water, it is aqueous
also you should memorize the equations for photosynthesis, cellular respiration (i don't rlly know if you need to know it but just in case) and anaerobic fermentation
photosynthesis: 6H2O (l) + 6CO2 (g) ------> C6H12O6 (aq) + 6CO2 (g)
cellular respiration: C6H12O6 (aq) + 6O2 (g) --> 6CO2 (g) + 6H2O (l) + ATP/energy
anaerobic fermentation: C6H12O6 (aq) -----> 2C2H5OH (aq) + 2CO2 (g)
You should also know reactions involving acids and bases (covered in unit 1/2)
In general, there are reactant and product states associated with each type of reaction, you should especially make sure you know the form of thermochemical equations and combustion equations, as well as memorise the equations for photosynthesis, cellular respiration, and anaerobic fermentation, and know the form of reactions involving acids and bases.
