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Unit 1 Study Guide

# Unit 1 Study Guide - Unit 1 Study Guide 1 It is estimated...

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Unit 1 Study Guide 1. It is estimated that uranium is relatively common in the earth's crust, occurring in amounts of 4 g / metric ton. A metric ton is 1000 kg. At this concentration, what mass of uranium is present in 1.5 mg of the earth's crust? A) 6 nanograms B) 6 micrograms C) 6 milligrams D) 6e–5 g E) 6 centigrams 2. In 1928, 98.0 g of a new element was isolated from 660 kg of the ore molybdenite. The percent by mass of this element in the ore was: A) 150 % B) 6.6 % C) 98.0 % D) 1.5e–2 % E) 64.7 % 3. Which of the following metric relationships is incorrect? A) 1 microliter = 10 –6 liters B) 1 gram = 10 3 kilograms C) 10 3 milliliters = 1 liter D) 1 gram = 10 2 centigrams E) 10 decimeters = 1 meter 4. Which of the following is an example of a quantitative observation? A) The piece of metal is longer than the piece of wood B) Solution 1 is much darker than solution 2. C) The liquid in beaker A is blue. D) The temperature of the liquid is 60°C. E) At least two of the above (a-d) are quantitative observations. 5. A quantitative observation A) contains a number and a unit. B) does not contain a number. C) always makes a comparison. D) must be obtained through experimentation. E) none of these 6. Generally observed behavior which can be formulated into a statement, sometimes mathematical in nature, is called a(n) A) observation. B) measurement. C) theory. D) natural law. E) experiment. 7. The statement “The total mass of materials is not affected by a chemical change in those materials” is called a(n) A) observation. B) measurement. C) theory. D) natural law. E) experiment. 8. What is the measure of resistance an object has to a change in its state of motion? A) mass B) weight C) volume D) length E) none of these 9. Express 0.00560 in exponential notation. A) 5.60 × 10 3 B) 5.6 × 10 -3 C) 5.60 × 10 -3 D) 5.60 E) none of these 10. A titration was performed to find the concentration of hydrochloric acid with the following results: Trial Molarity 1 1.25 ± 0.01 2 1.24 ± 0.01 3 1.26 ± 0.01 A) both accurate and precise. B) accurate but imprecise. C) precise but inaccurate. D) both inaccurate and imprecise. E) accuracy and precision are impossible to determine with the available information. 11. Which of the following is the least probable concerning five measurements taken in the lab? A) The measurements are accurate and precise. B) The measurements are accurate but not precise. C) The measurements are precise but not accurate. D) The measurements are neither accurate nor precise. E) All of these are equally probable. 12. We generally report a measurement by recording all of the certain digits plus ____ uncertain digit(s). A) no B) one C) two D) three E) four 13. The amount of uncertainty in a measured quantity is determined by: A) both the skill of the observer and the limitations of the measuring instrument. B)

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Unit 1 Study Guide - Unit 1 Study Guide 1 It is estimated...

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