11. Give formulas of the following compounds: Disulphur dichloride b. Tetraphosp

Question

11. Give formulas of the following compounds:

Disulphur dichloride   b. Tetraphosphorus trisulfide

      c.    Carbon disulfide         d. Sulfur trioxide

12. What are the name and formula of the anion of the corresponding to perbromic acid,    

       HBrO4?

13. Give the name and formula of the acid corresponding to bromate ion, BrO3-?

14. What is the chemical name of the substance?

MgSO4. 7H2O    b. Na2CO3.10 H2O    c. Na2SO4. 10H2O     d. FeSO4. 7H2O

15. The mineral gypsum has the chemical name, calcium sulfate dihydrate. What is the chemical

      formula of this substance?
16. Balance the following equations:
     a. H3PO3                               H3PO4   + PH3

   b. Ca   + H2O                    Ca(OH)2   +   H2

    c. Fe2(SO4)3 + NH3 + H2O                                        Fe(OH)3   + ( NH4)2SO4

     d. O2   +   PCl3                                     POCl3

    e. P4   +   N2O                          P4O6   +N2

     f. Sn + NaOH                         Na2SnO2 + H2

     g. CH3OH + O2                      CO2 + H2O

Explanation / Answer

11 (a) S2Cl2

(b) P4S3

© CS2

(d) SO3

(12) Perbromate ion, BrO4-

(13)

(14) MgSO4. 7H2O - Epsom, Magnesium Sulphate

Na2CO3.10 H2O – Sodiun carbonate decahydrate.

Na2SO4. 10H2O - Sodium Sulfate Decahydrate

FeSO4. 7H2O – Iron Sulphate heptahydrate

(15) CaH4O6S

(16) (a) 4H3PO3    => 3H3PO4   + PH3

(b) Ca   + 2H2O   =>   Ca(OH)2   +   H2

© Fe2(SO4)3 + 6NH3 + 6H2O       =>     2Fe(OH)3   + 3( NH4)2SO4

(d) O2   +   2PCl3  =>   2POCl3

(e) P4   +  6 N2O  =>   P4O6   + 6N2

(f) Sn + 2 NaOH    => Na2SnO2 + H2

(g) 2CH3OH + 3O2  =>   2CO2 + 4H2O

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