University:
Kentucky State University
Course:
CHE 101 | General Chemistry I
Academic year:

2020
Views:

223

Pages:

6
Author:

elongeaborblid

CHAPTER 1 1. What is the length of 1.85 kilometre in units of micrometre with the correct number of significant figures? A) 1.85 * 10-9 B) 1.85 * 109 C) 2 * 10-5 D) 1.85 * 106 E) 2 * 10-6 2. The SI units for length and amount of substance respectively are: A) meter and gram B) kilo meter and mole C) kg and mole D) meter and mole 3. Convert 50 Pm3 to Am3: A) 5 * 10-5 B) 5 * 105 C) 5 * 10-7 D) 5 * 10-2 E) none of the above P a g e 2 | 45 4. Convert 40 (ng/cm3) to (pg/dm3): A) 4 * 107 B) 4 * 108 C) 4 * 109 D) 4 * 104 5. The density in (g/mol) of a metal piece that has a volume of 1.68 cm3 and amass of a 52.8 g is: A) 10 B) 21 C) 31.4 D) 0.1212 6. How many significant figures are there in 0.3070? A) 6 B) 5 C) 4 D) 3 7. Which of the following is an intensive property? A) length B) area C) density D) energy P a g e 3 | 45 8. How many significant figures does the result of the following operation contain? (8.52010 * 7.9) A) 2 B) 3 C) 4 D) 5 E) 6 9. The result of (3.8621 * 1.5630) – 5.98 is properly written as: A) 0.06 B) 0.05646 C) 0.056462 D) 0.0565 E) 0.056 10. The agreement of a particular value of measurement with the true value is called: A) significance B) certainty C) precision D) error E) accuracy P a g e 4 | 45 11. Which of the following represents a chemical change: A) melting of solid H2O B) separation of H2O molecule into its atoms C) Evaporation of liquid H2O D) Mixing H2O with oil E) condensation of H2O vapor 12. Which of the following is an extensive property? A) mass B) temperature C) boiling point D) density 13. Convert 77oF to Kelvin scale. A) 245 K B) 452 K C) 298 K D) 195 K 14. Which of these is an example of a physical change? A) corrosiveness of acid B) apples when exposed to air, turn brown C) lead becomes a liquid when heated to 601oC D) burning of wood P a g e 5 | 45 15. Round the following number (0.0084977) into 4 digits with writing the answer in scientific notation. A) 8.4977 * 10-3 B) 8.4977 * 103 C) 8.498 * 10-3 D) 8.497 * 103 E) 8.5 * 103 16. Perform the following mathematical operation and express the result in the appropriate number of significant figures: ((2.085 * 4.1) – 1.13) = ? A) 7.4185 B) 7.419 C) 7.42 D) 7.4 E) 7.0 17. The SI temperature unit is: A) oC B) oF C) K D) both A & B E) both A & C P a g e 6 | 45 18. Accuracy is defined as: A) a measure of how often an experimental value can be repeated. B) the closeness of a measured value to the true value. C) the number of significant figures used in a measurement. D) none of the above. 19. Which of the following equalities is wrong? A) 1.35 micrometres = 1.35 * 103 millimetres B) 7.43 * 10-2 nanometre = 7.43 * 10-8 millilitres C) 3.5 kilograms = 3.5 * 106 milligrams D) 1.89 * 104 decilitter = 1.89 * 103 litter 20. The speed of a car is 32.0 miles/hour. What is its speed in m/s? (given 1 mile = 1609 m) A) 14.3 B) 16.1 C) 18.8 D) 20.6 P a g e 7 | 45

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