Write an tonic equation for the hydrolysis reactions of $ZnC{l}_2$ and $N{a}_{2}C{O}_3.$ Predict the pH of the solution $($equal $7,$ greater than $7,$ less than$7).$

Write the equation for the reaction:

$Zn+H_{2}S{O}_4(diluted)$

Identify the oxidizing and reducing agents in the equation above. Determine the EMF value using the standard reduction potential table.

$5.$ Write a balanced molecular equation for the Red$-$Ox reaction, hydrolysis of the salt and metal reaction with hydrolysis product:

$Co+Cu(N{O}_3{)}_2$

$6.$A galvanic cell is set up as follows:

$Zn|Z{n}^{2+}(0\mathrm{.}001\frac{\text{m}\text{o}\text{l}}{L})||C{u}^2(0\mathrm{.}1\frac{\text{m}\text{o}\text{l}}{L})|Cu.$ Write the equations for the half reactions and calculate the theoretical voltage produced by this cell.

$7.$Steel plate is in contact with zinc. Give the scheme of electrochemical corrosion in acidic medium and write equations for the reactions that oceur $($anode and cathode reactions$).$

$8.$ Classify following polymers as natural or synthetic cellulose, polystyrene, starch, polypropylene.

$9.$ Please indicate the $3$ key areas of crude oil uses.

$10.$ Is polypropylene is a biodegradable polymer?