Write the chemical formula of the following compounds.

1. Lead (II) chloride ______________________
2. Iron (III) oxide ______________________
3. Tin (IV) chloride ______________________
4. Chromium (III) sulfide ______________________
5. Manganese (III) chloride ______________________
6. Copper (I) oxide ______________________
7. Cobalt (III) selenide ______________________
8. Zinc chloride ______________________
9. Nickel (II) chloride ______________________
10. Iron (II) bromide ______________________
    Write the proper chemical name of the following compounds.
11. Fe2S3 ______________________
12. SnO2 ______________________
13. CuCl2 ______________________
14. CoBr3 ______________________
15. Hg2O ______________________
16. FeO ______________________
17. PbCl4 ______________________
18. CrF3 ______________________
19. CuO ______________________
20. PbS ______________________
    Write the classical name of the following compounds.
21. Fe2O3 ______________________
22. Cu2O ______________________
23. CrF3 ______________________
24. PbO2 ______________________
25. Co2S3 ______________________