Ex. 2 Answer the questions 1. What is electrolysis?
2. How is this process achieved?
3. Is this method used in biology or in chemistry?
4. What happens with ions when the salt is in its solid state?
5. What metals are active?
Ex. 3 Rewrite the following sentences in Passive 1. We can electrolyze aqueous solutions.
2. I reduced water.
3. I have obtained interesting results.
4. Yesterday I measured the concentration.
5. I am calculating molecular mass now.
6. We were submersing en electrically conductive solution in electrodes.
7. This salt makes this substance active.
Ex. 4 Rewrite the following sentences in Active 1. Water has been added to this solution by me.
2. The substances were analyzed by us three days ago.
3. The salt was being heated by Jane.
4. This reaction must be studied by the students.
5. Has this substance been obtained by you?
6. This concentration was measured by him yesterday.
7. Can redox reactions be studied by her next time?
Ex. 5 Put the questions to the bold-typed words 1. It is determined by the following rules.
2. Water wasn’t oxidized.
3. This metal is reduced at the cathode. 4. A molten salt may be electrolyzed in the solution.
5. Electrons are received by the cathode.
6. These shells were filled by electrons.
7. The salt is made electrically conductive by the mobility of ions.
Ex. 6 Correct the mistakes in the sentences 1. Acid has been obtain by me.
2. Who was these methods studied by?
3. Hydrocarbons are mainly uses in petrochemical industry.
4. Electrons is supply by electrodes.
5. The physical state are determined by molecular mass.
6. Volume and molecular mass was measured by us last week.
7. How has molarity bee calculated?
8. Water can is demineralized at high temperature.
