UNIT 7 REVIEW

Part 1 – Write the formulas for the following compounds:

1.) chromium (III) acetate

2.) silver iodide

3.) calcium perchlorate

4.) carbon disulfide

5.) zinc hydroxide

6.) cesium phosphide

7.) ammonium sulfate

8.) copper (I) oxide

Part 2 – Name the following compounds:

9.) LiNO₃

10.) PCl₃

11.) ZnCO₃

12.) Pb(CrO₄)₂

13.) AlF₃

14.) NiS

15.) NH₄NO₃

16.) K₃N

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

17.) K₂C₂O₄

18.) Ca(ClO)₂

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?

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 ^. ___ H₂O

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