When a nutrient moves, with the help of a carrier, from an area of higher solute concentration into an absorptive cell where the concentration is lower, this is called .a. phagocytosis. b. passive diffusion. c. facilitated diffusion. d. active 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.)

To calculate the molarity of a solution, you need to know the moles of solute and the

Give one example of a pure (exact) number and of an estimated (measured) number.