Predict what would happen to the percent yield (greater than, less than, no change) if the following occurred:

• the solid is not completely dry
• you reversed the volumes of the two liquids

explain

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.)

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.

Draw a line graph showing the relationship between temperature in kelvin as a function of kinetic energy.