1. A sample of oxygen has a volume of 2.1 L when the pressure is 375 torr, what is the volume when the pressure is 663 torr?

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 prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules