Answer the following question given this paragraph: 

Many chemical equations also include phase labels for the substances: (s) for solid, (ℓ) for liquid, (g) for gas, and (aq) for aqueous (i. , dissolved in water). Special conditions, such as temperature, may also be listed above the arrow. For example, 2NaHCO.


Q: Phase labels - and even special conditions - are sometimes included for the substances that are part of what?

 Choices:

- solid equations

- toxic equations

- carbon equations

- chemical equations

A:
chemical equations
