Which of the questions below is scientific? O A. Are copper statues more attractive than stainless-steel statues? B. Why is copper a better electrical conductor than iron? C. How much does a kilogram of copper cost? O D. How much copper wire is used in building a house?​

Type the letter that represents the correct location for each particle type below.

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.)

What is formed when amino acids form long chains or polymerize