UNIT 7 REVIEW

 

Part 1 Write the formulas for the following compounds:

1.) chromium (III) acetate Cr(C2H3O2)3

2.) silver iodide AgI

3.) calcium perchlorate Ca(ClO4)2

4.) carbon disulfide CS2

5.) zinc hydroxide Zn(OH)2

6.) cesium phosphide Cs3P

7.) ammonium sulfate (NH4)2SO4

8.) copper (I) oxide Cu2O

 

Part 2 Name the following compounds:

9.) LiNO3 lithium nitrate

10.) PCl3 phosphorus trichloride

11.) ZnCO3 zinc carbonate

12.) Pb(CrO4)2 lead (IV) chromate

13.) AlF3 aluminum fluoride

14.) NiS nickel (II) sulfide

15.) NH4NO3 ammonium nitrate

16.) K3N potassium nitride

 

Part 3 Determine the oxidation number and percent composition of the underlined element in the compound:

17.) K2C2O4 (2.+1) + (2.x) + (4.-2) = 0

2 + 2x -8 = 0

X = +3

24 x 100 = 14.4 % C
166.2

18.) Ca(ClO)2 (1.+2) + (2.x) + (2.-2) = 0

2 + 2x -4 = 0

X = +1

71 x 100 = 49.6 % Cl
143.1

 

Part 4 Solve the following problems:

19.) Benzoic acid is a compound used as a food preservative. The compound contains 68.8 % carbon, 4.95 % hydrogen, and 26.2 % oxygen. What is the empirical formula for benzoic acid? If the molar mass of the molecular formula is 122 g/mole, what is the molecular formula? Empirical & Molecular Formula = C7H6O2

20.) A hydrated sample of cobalt (II) chloride has a mass of 29.7 grams. Once all of the water has evaporated from the sample, 16.2 grams of anhydrous salt remain. What is the empirical formula for this hydrate?

CoCl2 . 6 H2O

 

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