Exam1 - Version 215 Exam 1 Sutcliffe (53120) 1 This...

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Unformatted text preview: Version 215 Exam 1 Sutcliffe (53120) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. THIS EXAM SHOULD ONLY BE TAKEN BY THOSE IN THE 2-3PM SECTION!! 001 10.0 points What is the electronic configuration of yt- trium (symbol Y)? 1. 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 10 4 p 6 5 s 2 4 d 1 correct 2. 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 5 s 2 5 p 1 3. 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 5 s 3 4. 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 4 p 6 3 d 10 3 f 3 5. 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 4 d 3 Explanation: 002 10.0 points Convert 217 ounces to kilograms. 1. 0.00765 kg 2. 6.15 kg correct 3. 1570 kg 4. 0.163 kg 5. 2 . 99 10- 5 kg 6. 7650 kg 7. 29.9 kg 8. 1 . 57 10 9 kg 9. 6 . 15 10 6 kg Explanation: 217 ounces 1 lb 16 oz 1 kg 2 . 205 lb = 6 . 15079 kg 003 10.0 points Which element exists as a diatomic molecule in its most stable state? 1. water 2. sulfur 3. boron 4. hydrogen correct 5. phosphorus Explanation: H, N, O, F, Cl, Br, and I all exist in nature as diatomic molecules. Note: Water isnt even an element; it is a compound. 004 10.0 points The electron configuration 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 could represent 1. none of the ions or atoms mentioned. 2. a neutral atom of Ar. 3. any of the ions or atoms mentioned. cor- rect 4. a Cl- ion. 5. a K + ion. Explanation: 005 10.0 points An electron in a 3 d orbital could have which of the following quantum numbers? 1. n = 3; = 1; m = 2 2. n = 3; = 3; m = 1 3. n = 3; = 0; m = 0 4. n = 3; = 1; m =- 1 5. n = 3; = 2; m = 0 correct Version 215 Exam 1 Sutcliffe (53120) 2 6. n = 2; = 2; m = 6 7. n = 3; = 2; m =- 3 Explanation: 3 refers to the principal quantum number n . d corresponds to the subsidiary quantum number = 2. Since = 2, m could be- 2 ,- 1 , , 1 or 2. 006 10.0 points How many protons are present in one Ca 2+ ion? 1. 18 2. 20 correct 3. 19 4. 21 5. 22 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. Calcium has an atomic number of 20. 007 10.0 points Which of the following atoms has the largest radius? 1. K correct 2. Si 3. Br 4. Mg 5. Li Explanation: Radii tend to increase to the left of and down the periodic table. Across a period, towards the right, the number of protons increases, but the num- ber of shells does not. This increased positive charge pulls electrons to the nucleus. There- fore across a period atomic radii decreases....
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This note was uploaded on 12/11/2009 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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Exam1 - Version 215 Exam 1 Sutcliffe (53120) 1 This...

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