Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced. ) Mg(s) Cu2 (aq) → Cu(s) Mg2 (aq) Mg2 (aq) 2 e- → Mg(s) E° = -2. 38 V Cu2 (aq) 2 e- → Cu(s) E° = 0. 34 V.

What reaction is taking place? 02 + c3h8 = h20 + co2

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.)

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table