What is molarity a measurement of? A. The concentration of a substance dissolved in a liquid
B. The grams of a substance dissolved in a liquid
C. The volume of liquid containing a dissolved substance
D. The number of moles of a dissolved substance

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

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.)

How does the viscosity of magma change as magma cools?