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HCC CHEM 161 - WORKSHEET

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J. Muench WORKSHEET #3 ___________________ CHEM 161 name 1. Decide whether the following compounds are molecular (M) or ionic (I). a. Mg3N2 b. ClF3 c. Cr2O3 d. Al(ClO3)3 e. V2O5 f. P2O5 g. IF5 h. (NH4)2S 2. Write the correct formula for a compound formed between each of the ions. a. K+ and S-2 b. Sr+2 and Br- c. Fe+3 and O-2 d. Ni+2 and NO3- e. Al+3 and SO4-2 f. Li+ and PO4-3 3. Name the following - remember how you classified these in Q#1. a. Mg3N2 e. V2O5 b. ClF3 f. P2O5 c. Cr2O3 g. IF5 d. Al(ClO3)3 h. (NH4)2S 4. For each of the names, provide the correct formula. a. iron(III) nitrate e. sulfur trioxide b. silver oxide f. copper(I) oxide c. carbon disulfide g. zinc bicarbonate d. potassium chromate h. ammonium perchlorateJ. Muench 5. Calculate the Molar Mass to the nearest 0.1g for: a. MgBr2 b. V(NO3)3 c. phosphorus pentafluoride d. manganese(II) hydroxide 6. Determine the following quantities. Remember to use significant figures. Note – you will need to determine the formula from the name FIRST. a. the mass of 0.0876 moles of potassium chromate. b. the number of moles in 3.55g of iron(III) nitrate. c. the number of molecules of sulfur trioxide in 0.750g of sulfur trioxide. d. the mass of 2.52 x 1021 molecules of phosphorus tribromide. e. the number of O atoms in 3.00g of glucose, C6H12O6.J. Muench 7. What is the mass percent of each of the elements in the compound Calcium phosphate? Note – you will need to determine the correct formula FIRST. 8. A compound is found to contain 29.08% Na, 40.58% S, and 30.34% O by mass. What is the empirical formula for this compound? 9. The compound Terephthalic Acid is used in the manufacture of plastics. The compound contains only the elements C, H, and O. Elemental Analysis shows that it is 57.8% C and 3.6% H by mass. If the MW of this compound is 166g/mol, then what is the molecular formula for Terephthalic Acid? 10. An oxychloride compound, NaClOx, where x is to be determined, is known to contain 33.33% Cl. What is the subscript x? Hint: determine the moles of Cl first and then use the fact that the mole ratio of Na to Cl is 1:1 in the formula.J. Muench 11. Combustion analysis of 12.01g of a compound containing C, H, and O produced 14.08g of CO2 and 4.32g of H2O. Find the empirical formula for this compound. 12. Balance the following simple reactions. a. ___ Al(OH)3 + ___H2SO4 ___ H2O + ___Al2(SO4)3 b. __P4O10 + __H2O __H3PO4 c. ___ C6H5OH + ___O2 ___CO2 + ___H2O d. ___ (NH4)2Cr2O7 ___ Cr2O3 + ___ H2O + ___ N2 e. ___ Mg + ___ Fe2O3 ___ MgO + ___ Fe 13. Match the following to their classification. a. CH3 – C CH ____Alkane b. CH3 – CH2 – CH2 ____ Cycloalkane c. CH2 – CH2 ____ Alkene CH2 – CH2 d. CH3 – CH = CH2 ____ AlkyneJ. Muench 14. Match the organic molecule to the functional group. ____ CH3CH2OCH2CH3 a. alcohol ____ CH3CCH2CH2CH3 b. ketone O ____ CH3CH2C–H c. carboxylic acid O ____ CH3CH2NH2 d. aldehyde ____ CH3CHCH3 e. amine OH ____ CH3CH2CH2C–OH f. ether


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