A student uses a device to measure a string. The units reported on the device are haggards, hg, and he measures the string to be 14.9 haggards. Using the following conversion factors, report the measurement in centimeters. 1hg = 2.3 zazzles: 1farb = 3.2 zazzles; 9.1 cm = 1 farbs

This question is about electrolysis. metal spoons can be coated with silver. this is called electroplating. suggest one reason why spoons are electroplated?

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 many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work