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Introductory Chemistry: Atoms First, 5e (Russo/Silver) Chapter 2 The Numerical Side of Chemistry 2.1 Multiple-Choice Questions 1) Identify the exact number. A) a number of coins B) the diameter of a coin C) the radius of a coin D) the mass of a coin Answer: A Section: Section 2.1 Learning Outcome: 2.1 Explain what an exact number is and what a measured number is. Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills. 2) Identify the piece of glassware that provides the least precise volume measurement of a liquid. A) beaker B) graduated cylinder C) buret D) pipette Answer: A Section: Section 2.1 Learning Outcome: 2.3 Explain why measured numbers always have uncertainty associated with them. Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills. 3) Which of the following represents an estimated measurement? A) A calendar week has 7 days. B) The U.S. national debt is 6 trillion dollars. C) There are 50 states in the United States of America. D) My bank account contains 19 dollars and 26 cents. Answer: B Section: Section 2.1 Learning Outcome: 2.1 Explain what an exact number is and what a measured number is. Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills. 4) For the measured value 6.73 pounds, what is the degree of uncertainty? A) +/- 10 pounds