Chem 152L Final Review Key Fa10

Chem 152L Final Review Key Fa10 - KEY Final Exam Review...

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KEY Brinton, MC Chem 152L Final Exam Review Instructions: Use dimensional analysis wherever appropriate! Include all units in your set-up and answer, pay attention to significant figures, and show your work! No work = no credit!! 1. What is the metric system base unit of each for the following types of measurements? length meter (m) volume liter (L) mass gram (g) temperature degree Celsius (ºC) 2. The metric system uses prefixes to indicate powers of ten relative to a base unit. Using prefixes, give the metric unit corresponding to each of the following powers of 10. 10 9 meters = 1 gigameter (Gm) 10 -1 meter = 1 decimeter (dm) 10 6 meters = 1 megameter (Mm) 10 -2 meter = 1 centimeter (cm) 3. Describe the procedure for lighting a Bunsen burner safely using a match. 1. Make sure everything is hooked up correctly, that tubing is intact, and the gas is off. 2. Light the match and hold it next to the stem of the burner, slightly below the opening. 3. Turn on the gas and slowly raise the lit match up until the gas catches. (If the flame goes out before the gas catches fire, turn off the gas and allow any built up gas in the area to dissipate before trying again.) 4. Once the burner is lit, adjust the flame height and color to achieve a hot flame. 4. Describe how you should be dressed, from head to feet, when performing lab experiments. Head: You should wear safety goggles and tie back long, loose hair. Upper body: Wear a moderately close-fitting (i.e., not baggy) shirt that covers your shoulders and stomach. Sleeves should be at least T-shirt length. Lower body: Wear long pants, or shorts or a skirt that goes at least to your knees. Feet: Wear closed-toe shoes that cover your entire foot.
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KEY Brinton, MC Chem 152L 5. A rectangular solid has a mass of 110.786 g and has the following dimensions: 3.63 cm by 5.48 cm by 4.19 cm. Calculate the density of the solid. m = 110.786 g V = l × w × h = 3.63 cm × 5.48 cm × 4.19 cm = 83.349156 cm 3 = 83.3 cm 3 3 g 3 cm m 110.786 g 1 32996 V 83.3 cm D . = = = = 1.33 3 g cm 6. Explain how weighing by difference can be used to find the mass of a particular volume of liquid. Weighing by difference is a technique for finding the mass of a substance (usually liquid) in a container. First the empty container is weighed. Then a particular volume of liquid is added and the combined mass of the container and liquid is found. To find the mass of the liquid alone, the mass of the container is subtracted from the combined mass. (mass of container + mass of liquid) – (mass of container) = mass of liquid 7. State the physical quantity (e.g., length, mass, etc.) expressed by the following units. 8. State the significant figures in each of the following measurements. 9.
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This note was uploaded on 01/31/2011 for the course CHEM 152 taught by Professor Selchau during the Fall '10 term at Miramar College.

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Chem 152L Final Review Key Fa10 - KEY Final Exam Review...

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