Which of the following statements is correct? 2. Both compounds and mixtures can be separated by physical means.
b. Compounds can be separated by physical means, but mixtures cannot.
c. Mixtures can be separated by physical means, but compounds cannot.
d. Neither compounds nor mixtures can be separated by physical means.

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.)

What is the oxidation state of an individual bromine atom in nabro3?

What is the difference between a substance "getting wet" and "being dissolved" in a liquid at the particulate level?