You are asked to determine the identity of an unknown liquid and can measure only one physical property. you heat a liquid and record the liquid turns to vapor at 100 celsius: this demonstrates which physical property?

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)