Practice Exam 1

Practice Exam 1 - 4/29/2008 3c2b1f50a44dbb73f10674d8ef06aef...

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5/7/2009 3c2b1f50a44dbb73f10674d8ef06aefa2e30a39c.doc Name _________________________________________________ This exams consists of three parts 1. One comic, only for your entertainment, worth = 0 pts 2. 25 multiple choice questions worth 4 pts each = 100 pts on pages 3 – 8 3. Descriptive questions/answers = 100 pts on the pages 10 – 13 Please allocate your time sufficiently to ensure you spend adequate time on all parts of the exam. All the information needed is given in the question/problems. In case you forgot, there are 6.02 x 10 23 pizzas in a mole of pizzas. Please select the most correct answer by your own assessment of the multiple choice question. If you answer a question, “I don’t know either ”, you may be subject to Delta College’s policy for grading fairness. Good luck! Chem 111 page 1 Alan Zombeck
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5/7/2009 3c2b1f50a44dbb73f10674d8ef06aefa2e30a39c.doc Chem 111 page 2 Alan Zombeck
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5/7/2009 3c2b1f50a44dbb73f10674d8ef06aefa2e30a39c.doc 1. A broad generalization based on many observations of relations between various pieces of observed data associated with natural phenomena that is broadly applicable to such data is called a. bull $#%* b the psychic hotline c. AZ’s jokes d. a scientific law e. if you got this far, you overlooked the correct answer, d. 2. Which response gives the correct number of significant figures for all three of the following measurements? 1) 7.103 cm 2) 0.00005 inch 3) 1.3400 x 10 - 4 dm 3 a. 3, 5, and 4 b. 3, 1, and 3 c. 4, 1, and 3 d. 4, 1, and 5 e. 4, 5, and 5 3. How many cubic inches are in 1.00 dm 3 ? 1 in = 2.54 cm. a. 61.0 in 3 b. 155 in 3 c. 394 in 3 d. 1.64 x 10 4 in 3 e. 383 x 10 2 in 3 4. The percentage of nitrogen in urea, CO(NH 2 ) 2 a. 14.00% b. 23.33% c. 31.81% d. 46.67% Chem 111 page 3 Alan Zombeck
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5/7/2009 3c2b1f50a44dbb73f10674d8ef06aefa2e30a39c.doc 5. An empty volumetric flask, weighing 60.42 grams, weighed 309.60 grams when filled with water. After emptying the water and drying the flask, it was filled with ethylene glycol. It now weighed 338.72 grams. What is the specific gravity of the ethylene glycol if the density of water is 1g/mL? a. 0.8048 b. 0.9140 c. 1.094 d. 1.1169 e. 1.2424 6. Which one of the following is NOT correctly associated with Dalton’s Atomic Theory a) Matter consists of tiny particles called atoms b) Atoms are indestructible. c) The atoms of one particular element are all identical in mass and other properties d) The atoms of different elements differ in mass and other properties e) none of the above, they are all correct 7. Naturally occurring engrium, En, has the following composition. 1 4 7
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Practice Exam 1 - 4/29/2008 3c2b1f50a44dbb73f10674d8ef06aef...

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