Chemistry Quiz Essay

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Grading Summary These are the automatically computed results of your exam. Grades for essay questions, and comments from your instructor, are in the "Details" section below. | Date Taken: | 8/26/2014 | Time Spent: | 03 min , 32 secs | Points Received: | 100 / 100 (100%) | | Question Type: | # Of Questions: | # Correct: | Multiple Choice | 10 | 10 | | | Grade Details - All Questions | Question 1. | Question : | An element crystallizes in a face-centered cubic lattice. If the length of an edge of the unit cell is 0.408 nm, and the density of the element is 19.3 g/cm3, what is the identity of the element? | | | Student Answer: | | Gold | | | | Silver | | | | Tungsten | | | | Copper | | | | Points Received: | 10 of 10 | | Comments: | | | | Question 2. | Question : | How manu unit cells share an edge? | | | Student Answer: | | 1 | | | | 3 | | | | 4 | | | | 8 | | | | Points Received: | 10 of 10 | | Comments: | | | | Question 3. | Question : | Which of the following compounds is likely to have the lowest melting point? | | | Student Answer: | | H2O | | | | He | | | | NaCl | | | | NH3 | | | | Points Received: | 10 of 10 | | Comments: | | | | Question 4. | Question : | Which of the following statements are incorrect? 1. | A liquid boils when its vapor pressure is equal to the pressure above its surface. | 2. | Above the critical pressure and critical temperature, only the solid phase of a pure substance can exist. | 3. | The gas, liquid, and solid phases can all coexist at the critical point. | | | | | | Student Answer: | | 1 only | | | | 2 only | | | | 3 only | | | | 2 and 3 | | | | Points Received: | 10 of 10 | | Comments: |

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