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

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.

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.

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

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

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

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

The molar mass of a compound (choose the most correct answer) 1.is the mass of x 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 All of the above. 5. both 1 and 2. Edgar Fahs Smith Collection University of Pennsylvania Library

The molar mass of a compound (choose the most correct answer) 1.is the mass of x 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 All of the above. 5. both 1 and 2. Edgar Fahs Smith Collection University of Pennsylvania Library

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

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

Without the use of a calculator, the molar mass of ethanol, shown to the right, is u u g mol g mol u 1 H C O

Without the use of a calculator, the molar mass of ethanol shown to the right is u u g mol g mol u 1 H C O

In one mole of the compound acetone (or propanone), (CH 3 ) 2 CO, how many grams of carbon and hydrogen are there? g C, 1 g H g C, 3 g H g C, 3 g H g C, 6 g H g C, 6 g H 1 H C O

In one mole of the compound acetone (or propanone), (CH 3 ) 2 CO, how many grams of carbon and hydrogen are there? g C, 1 g H g C, 3 g H g C, 3 g H g C, 6 g H g C, 6 g H 1 H C O

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.

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.

Which of the following compounds has the highest percentage of carbon by mass? chloromethane 1. 2-iodoopropane 3. difluoromethane 4. chloroethane 2. 9 F Cl Br I A

Which of the following compounds has the highest percentage of carbon by mass? chloromethane 1. 2-iodoopropane 3. difluoromethane 4. chloroethane 2. 9 F Cl Br I A

The oxidation number for N in nitric acid, HNO 3, is

The oxidation number for N in nitric acid, HNO 3, is

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.

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.

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 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

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 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

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

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

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

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

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.

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.

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

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