An object's mass is a measure of how much matter makes it up. An object's weight is a measure of the gravitational force that acts on it. An object's mass is always its weight.

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

Energy is released during which phase changes? check all that apply. boiling condensing depositing freezing melting subliming

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon