How many unpaired electrons are in a: a. zinc atom 0 correct: your answer is correct. b. nitrogen atom 3 correct: your answer is correct. c. chlorine atom 1 correct: your answer is correct. d. nickel atom 0 incorrect: your answer is incorrect. submit answer?

The reaction q+r2=r2q is found to be first order in r2 and

What type of electromagnetic radiation has a shorter wavelength than blue light

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.)