Based on the understanding of the way the metals are placed in the activity series, the student correctly predicted the outcome of four reactions. According to the student, which reactions are most likely to take place? Select all that apply. A. Zn and CuSO4
B. Ag and CuSO4
C. Fe and ZnSO4
D. Mg and ZnSO4

Which other elements contain the same number of outer electrons as sodium

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.)

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?