1. General Chemistry Principles & Modern Applications 9 th Edition Petrucci/Harwood/Herring/Madura Chapter 3 Chemical Compounds Dr. Travis D. Fridgen Memorial University of Newfoundland © 2007 Pearson Education

2. In the box to the right is (choose the best answer), Acetylsalicylic acid (aspirin) 1.a formula unit of the ionic compound acetylsalicylic acid. 2. a molecular model of the molecular compound acetylsalicylic acid. 3. a structural formula for the ionic compound acetylsalicylic acid. 4. a molecular formula for the molecular compound acetylsalicylic acid. 5. an ionic compound with the empirical formula C 9 O 4 H 8.

3. In the box to the right is (choose the best answer), Acetylsalicylic acid (aspirin) 1.a formula unit of the ionic compound acetylsalicylic acid. 2. a molecular model of the molecular compound acetylsalicylic acid. 3. a structural formula for the ionic compound acetylsalicylic acid. 4. a molecular formula for the molecular compound acetylsalicylic acid. 5. an ionic compound with the empirical formula C 9 O 4 H 8.

4. For the ball and stick model of naphthalene to the right, the empirical formula is 1. C 10 H 8 2. C 4 H 5 3. C 5 H 4 4. CH

5. For the ball and stick model of naphthalene to the right, the empirical formula is 1. C 10 H 8 2. C 4 H 5 3. C 5 H 4 4. CH

6. For the ball and stick model of pyrimidine to the right, the molecular formula is: 1. C 4 N 2 H 4 2. C 2 N 2 H 2 3. C 2 NH 2 4. (CH) 4 N 2

7. For the ball and stick model of pyrimidine to the right, the molecular formula is: 1. C 4 N 2 H 4 2. C 2 N 2 H 2 3. C 2 NH 2 4. (CH) 4 N 2

8. The molar mass of a compound (choose the most correct answer) 1.is the mass of 6.022 x 10 23 molecules of the compound. 2. is the mass of 1 mole of molecules of the compound. 3. is the same as the formula mass of themolecule expressed in g mol -1. 4. All of the above. 5. both 1 and 2. Edgar Fahs Smith Collection University of Pennsylvania Library

9. The molar mass of a compound (choose the most correct answer) 1.is the mass of 6.022 x 10 23 molecules of the compound. 2. is the mass of 1 mole of molecules of thecompound. 3. is the same as the formula mass of the molecule expressed in g mol -1. 4. All of the above. 5. both 1 and 2. Edgar Fahs Smith Collection University of Pennsylvania Library

10. Without doing detailed calculations or using a calculator, which of the following has the greatest number of oxygen atoms? 1.0.5 moles of oxygen. 2.6.022 x 10 23 molecules of water. oxygen water glycerol acetic acid 4.0.5 moles of glycerol. 3.0.25 moles of acetic acid.

11. Without doing detailed calculations or using a calculator, which of the following has the greatest number of oxygen atoms? 1.0.5 moles of oxygen. 2.6.022 x 10 23 molecules of water. oxygen water glycerol acetic acid 4.0.5 moles of glycerol. 3.0.25 moles of acetic acid.

12. Without the use of a calculator, the molar mass of ethanol, shown to the right, is 1. 29 u 2. 45 u 3. 45 g mol -1 5. 46 g mol -1 4. 46 u 1 H 1.00794 6 C 12.011 8 O 15.9994

13. Without the use of a calculator, the molar mass of ethanol shown to the right is 1. 29 u 2. 45 u 3. 45 g mol -1 5. 46 g mol -1 4. 46 u 1 H 1.00794 6 C 12.011 8 O 15.9994

14. In one mole of the compound acetone (or propanone), (CH 3 ) 2 CO, how many grams of carbon and hydrogen are there? 1. 12 g C, 1 g H 2. 12 g C, 3 g H 3. 24 g C, 3 g H 4. 24 g C, 6 g H 5. 36 g C, 6 g H 1 H 1.00794 6 C 12.011 8 O 15.9994

15. In one mole of the compound acetone (or propanone), (CH 3 ) 2 CO, how many grams of carbon and hydrogen are there? 1. 12 g C, 1 g H 2. 12 g C, 3 g H 3. 24 g C, 3 g H 4. 24 g C, 6 g H 5. 36 g C, 6 g H 1 H 1.00794 6 C 12.011 8 O 15.9994

16. Given the molecular formulas of glucose and dihydroxyacetone to the right, which of the following statements is false? dihydroxyacetone C 3 H 6 O 3 glucose C 6 H 12 O 6 1.The highest percentage by mass is that of oxygen for both molecules. 2. The empirical formulas for both molecules is CH 2 O. 3. The percentages by mass of C and O are the same as in carbon monoxide, CO. 4. The lowest percentage by mass is that of H. 5. There are twice as many hydrogen atoms as oxygen atoms in both molecules.

17. Given the molecular formulas of glucose and dihydroxyacetone to the right, which of the following statements is false? dihydroxyacetone C 3 H 6 O 3 glucose C 6 H 12 O 6 1.The highest percentage by mass is that of oxygen for both molecules. 2. The empirical formulas for both molecules is CH 2 O. 3. The percentages by mass of C and O are the same as in carbon monoxide, CO. 4. The lowest percentage by mass is that of H. 5. There are twice as many hydrogen atoms as oxygen atoms in both molecules.

18. Which of the following compounds has the highest percentage of carbon by mass? chloromethane 1. 2-iodoopropane 3. difluoromethane 4. chloroethane 2. 9 F 18.9984 17 Cl 35.4527 35 Br 79.904 53 I 126.904 17 7A

19. Which of the following compounds has the highest percentage of carbon by mass? chloromethane 1. 2-iodoopropane 3. difluoromethane 4. chloroethane 2. 9 F 18.9984 17 Cl 35.4527 35 Br 79.904 53 I 126.904 17 7A

20. The oxidation number for N in nitric acid, HNO 3, is 1. 1 2. 2 3. 3 4. 4 5. 5

21. The oxidation number for N in nitric acid, HNO 3, is 1. 1 2. 2 3. 3 4. 4 5. 5

22. acetic acid AB In acetic acid shown to the right, (choose the best answer) 1.The carbon labeled “A” has a more positive oxidation state than the one labeled “B” 2. The carbon labeled “B” has a more positive oxidation state than the one labeled “A” 3. Both carbon atoms have the same oxidation state. 4. Cannot assign oxidation states to these carbon atoms.

23. acetic acid AB In acetic acid shown to the right, (choose the best answer) 1.The carbon labeled “A” has a more positive oxidation state than the one labeled “B” 2. The carbon labeled “B” has a more positive oxidation state than the one labeled “A” 3. Both carbon atoms have the same oxidation state. 4. Cannot assign oxidation states to these carbon atoms.

24. Potassium dichromate is used in breathalyzers. When it comes in contact with alcohol vapor it turns from orange to green. It is an ionic compound where the polyatomic anion has the formula Cr 2 O 7 2-. What is the chemical formula for potassium dichromate? POTASSIUM DICHROMATE 1. KCr 2 O 7 2. K(Cr 2 O 7 ) 2 3. K 2 Cr 2 O 7 4. K 2 (Cr 2 O 7 ) 3 5. K 3 (Cr 2 O 7 ) 2

25. Potassium dichromate is used in breathalyzers. When it comes in contact with alcohol vapor it turns from orange to green. It is an ionic compound where the polyatomic anion has the formula Cr 2 O 7 2-. What is the chemical formula for potassium dichromate? POTASSIUM DICHROMATE 1. KCr 2 O 7 2. K(Cr 2 O 7 ) 2 3. K 2 Cr 2 O 7 4. K 2 (Cr 2 O 7 ) 3 5. K 3 (Cr 2 O 7 ) 2

26. Sodium phosphate is an active component in some constipation medicines and enemas. The chemical formula for sodium phosphate is 1. NaPO 4 2. Na 2 PO 3 3. Na 2 PO 4 4. Na 3 PO 4 5. Na 3 (PO 4 ) 2

27. Sodium phosphate is an active component in some constipation medicines and enemas. The chemical formula for sodium phosphate is 1. NaPO 4 2. Na 2 PO 3 3. Na 2 PO 4 4. Na 3 PO 4 5. Na 3 (PO 4 ) 2

28. A B The names of the two structural isomers to the right are: 1. A: 2-ethyl butane, B: 1,2-dimethyl butane 2. A: 3-ethyl butane, B: 2,3-dimethyl butane 3. A: 3-methyl pentane, B: 2,3-dimethyl butane 4. A: 3-methyl pentane, B: 2-isopropyl propane 5. A: butyl ethane, B: 2-isopropyl propane

29. A B The names of the two structural isomers to the right are: 1. A: 2-ethyl butane, B: 1,2-dimethyl butane 2. A: 3-ethyl butane, B: 2,3-dimethyl butane 3. A: 3-methyl pentane, B: 2,3-dimethyl butane 4. A: 3-methyl pentane, B: 2-isopropyl propane 5. A: butyl ethane, B: 2-isopropyl propane

30. A C B D Which of the following compounds to the right are structural isomers? 1. A and C only. 2. B and D only. 3. A, B and C only. 4. A, C and D only. 5. All are structural isomers.

31. A C B D Which of the following compounds to the right are structural isomers? 1. A and C only. 2. B and D only. 3. A, B and C only. 4. A, C and D only. 5. All are structural isomers.

32. Upon complete combustion, some organic compounds can yield a greater mass of H 2 O than CO 2. 1. True 2. False

33. Upon complete combustion, some organic compounds can yield a greater mass of H 2 O than CO 2. 1. True 2. False