Final-solutions - Version 124 Final sutcliffe (52380) 1...

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Unformatted text preview: Version 124 Final sutcliffe (52380) 1 This print-out should have 45 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points How many - and -bonds, respectively, are there in acrolein (CH 2 CHCHO)? 1. 7 and 1 2. 4 and 2 3. 7 and 2 correct 4. 5 and 4 5. 5 and 2 Explanation: C H H C H C H O b b b b 002 10.0 points Which statement is TRUE about O 2 ? 1. It would be expected to have a shorter bond length than B 2 . correct 2. It is diamagnetic. 3. It has four electrons in 2 p orbitals. 4. It has a bond order of 3. Explanation: 003 10.0 points What happens when energy is added to a sample of ice at 0 C? 1. None of the other answers is correct. 2. The temperature of the sample decreases while the ice melts. 3. The temperature of the sample increases while the ice melts. 4. The sample remains solid and its temper- ature decreases. 5. The temperature of the sample remains constant while the ice melts. correct Explanation: Energy is being added, so the process is endothermic. Energy is required to melt a solid. As energy is added the temperature remains constant until all of the solid has melted to a liquid. 004 10.0 points One of the following does NOT represent the ground state electron configuration for an atom. Which one? 1. [Ar] 4 s 2 3 d 6 2. [Ar] 4 s 1 3 d 7 correct 3. [Ar] 4 s 1 3 d 5 4. [Ar] 4 s 2 3 d 10 4 p 3 5. [Ar] 4 s 1 Explanation: 005 10.0 points Balance the equation ? As 2 S 3 +? O 2 ? As 4 O 6 +? SO 2 , using the smallest possible integers. What is the sum of the coefficients in the balanced equation? 1. 18 correct 2. 21 3. 16 Version 124 Final sutcliffe (52380) 2 4. 17 5. 20 Explanation: A balanced equation has the same num- ber of each kind of atom on both sides of the equation. We find the number of each kind of atom using equation coefficients and com- position stoichiometry. For example, we find there are 4 As atoms on the reactant side: ? As atoms = 2 As 2 S 3 2 As 1 As 2 S 3 = 4 As The balanced equation is 2 As 2 S 3 + 9 O 2 As 4 O 6 + 6 SO 2 , and has 4 As, 6 S and 18 O atoms on each side. ? sum coefficients = 2 + 9 + 1 + 6 = 18 006 10.0 points A double bond 1. is more polar than a single bond. 2. has a smaller bond order than a single bond. 3. has more electrons in anti-bonding or- bitals than in bonding orbitals. 4. has a longer bond length than a single bond. 5. has a higher bond order than a single bond. correct Explanation: Double bonds are stronger than single bonds so they have a higher bond order than single bonds. 007 10.0 points How many protons are present in one cop- per(II) ion? 1. 28 2. 31 3. 26 4. 27 5. 30 6. 29 correct Explanation: The atomic number of an element is equal to the number of protons in that elements nucleus. The number of protons defines an el- ement and cannot be changed without chang- ing the element....
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Final-solutions - Version 124 Final sutcliffe (52380) 1...

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