are composed of two or more covalently bonded atoms.
a). elements
b)molecules

Compare and contrast physical changes with chemical changes.

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

When hydrochloric acid reacts with potassium hydroxide solution, the following reaction occurs. hcl (aq) + koh (aq) h2o (l) + kcl (aq) the reaction gives off heat energy, so it is an reaction.