Dựa vào phương pháp MC-LCA0 (thuyết sorbital phần tư M0), hãy so sánh bậc liên kết, độ bền liên kết, độ dải liên kết giữa: NO và NO; CN và CN Trong số các phần tử và ion trên, phần tư và ion nào có tính thuần tú, nghịch tử

Which statement about the stamps is correct?

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.)

Which three statements represent the benefits of performing experiments using computer simulations?