A teacher mixes two clear liquids in a beaker. White solid particles form in the beaker fall to the bottom. What led the student to the observation that a chemical change took place?.

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.