Based on the balanced equation Cu(s) 1 Cl2(g) CuCl2(s) (a) How many moles of copper will be required to react with 0.5 mol of chlorine

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.)

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Connect the whole numbers on the periodic table to indicate what they represent?