When comparing the two elements in and p , the larger element is based on periodic trends alone. when comparing the two elements sn and c , the larger element is based on periodic trends alone. when comparing the two elements si and cu , the larger element is based on periodic trends alone. when comparing the two elements br and ga , the larger element is based on periodic trends alone?

How air particles exert a pressure on the inside of the balloon

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.)

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?