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solution6_pdf - goins(jmg3964 Post-lab 1 Lyon(51215 This...

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goins (jmg3964) – Post-lab 1 – Lyon – (51215) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This assignment is due at 8:00AM on the day of your next lecture class. 001 10.0 points Which of the following is a safe lab procedure? 1. Wear safety goggles when heating chemi- cals. correct 2. All of these are safe. 3. Carry out experiments you do not under- stand. 4. None of these is safe. 5. Remove your safety goggles to check a flame. 6. Work alone in the lab. Explanation: 002 10.0 points An important rule to follow in class is to 1. follow your teacher’s instructions. cor- rect 2. be very popular in your lab group. 3. eat lots of healthy snacks during lab. 4. get to lab early so you can start before class. Explanation: 003 10.0 points The density of ethyl alcohol is 0.790 g/mL. How many liters are in 1507 grams of ethyl alcohol? (Use significant digits.) 1. 1.190 L 2. 1.19 L 3. 1.91 L correct 4. 1.907 L Explanation: 004 10.0 points If acid is splashed on your lab partner, imme- diately do which of the following? 1. Wipe them off with a paper towel. 2. Wrap them in the fire blanket. 3. Flush the area with lots of water. cor- rect 4. Spray them with the fire extinguisher. Explanation: 005 10.0 points Assume the same temperature and pressure for both volumes of water. Compare the densities of 1 liter of water with a bathtub-full of water. The density of 1 liter of water is 1. the same as for a bath-tub full. correct 2. greater than for a bath-tub full. 3. less than for a bath-tub full. Explanation: 006 10.0 points Which of the following is a chemical change? 1. Sulfur dioxide is formed when sulfur com- bines with oxygen. correct 2. Ice forms in a pond. 3. A candle melts. 4. A rock is eroded by the wind. Explanation: 007 10.0 points
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goins (jmg3964) – Post-lab 1 – Lyon – (51215) 2 A liquid has a density of 0 . 89 g / mL. What would be the mass of a 56 mL sample of this liquid? 1. 50 g correct 2. 63 g 3. 0.063 g 4. 16 g 5. 0.016 g 6. 0.020 g Explanation: 008 10.0 points Consider the following properties: I) The boiling point of ethanol is 78 C. II) Objects made of silver become tar- nished. III) The red color of rubies is due to the presence of chromium ions.
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