Unit 1: Introduction to Chemistry’s Measurement and Problem Solving
Part 1 – Assignment: Identifying Significant Figures
Indicate the number of significant figures in each measurement. Then circle the uncertain digit.
1. 679.98 g 5SF 2. 50 002 L 5SF 3. 4.000 m 4SF 4. 0.000 9 m 1SF
5. 3001 g 4SF 6. 3000 m 1SF 7. 0.000 400 m 3SF 8. 0.000 06 g 1SF
9. 10 001 m 5SF 10. 10 000 L 1SF 11. 100.001 g 6SF 12. 0.010 10 mg 4SF
13. 0.809 00 nm 5SF 14. 10 030 L 4SF 15. 0.000 300 4 dam 4SF 16. 34 578 pg 5SF
17. 40 908 mL 5SF 18. 5.80 hL 3SF 19. 0.009 00 km 3SF 20. 3000. kg 4SF
Unit 1: Introduction to Chemistry’s Measurement and Problem Solving
Part 2 – Assignment: Mathematical Operations and Significant Figures – 1
1. 69.4 m 2. 36.8 g 3. 1100 m2 (2sf) 4. 50 m/s (1sf)
5. 10 001 m 6. 10 000 m 7. 51.0 m/s (3sf) 8. 15.7 m
9. 20 m 10. 1000 g 11. 80 m2 (1sf) 12. 75 m2 (2sf)
13. 5 m 14. 300 g 15. 4002 g 16. 4500.0 m
17. 23.9 g
18. When adding you look at the place value – not the total number of significant figures.
Unit 1: Introduction to Chemistry’s Measurement and Problem Solving
Part 3 – Assignment: Mathematical Operations and Significant Figures – 2
1. 2.3 m/s2 2. 2400 s2 3. 2000 m 4. 10 m/s
5. 917 m2 6. 0.06700 days 7. 6.5 g 8. 10 g
9. 5.347 g 10. 100g
Unit 1: Introduction to Chemistry’s Measurement and Problem Solving
Part 4 – Assignment: Scientific Notation
1. b, c, e, g, h
2. a. 1.01 x 1028 b. 1.2 x 102 c. 9.87 x 10-12 d. 5.600007 x 10-11
e. 6.87 x 100 f. 1 x 109 g. 9.0 x 10-7 h. 7.002 x 108
3. 54.259 x 10-11 = 5.426 x 10-10 4. 0.539 x 10-4 = 5.390 x 10-5
5. 0.5529 x 1011 = 5.53 x 1010 6. 7.993x10-8 + 0.08883x10-8 = 8.08183 x 10-8 = 8.082 x 10-8
7. -9.087 x 10-6 8. 9.625 x 108
9. a. qual b. quant c. qual d. quant
10. (e), (d), (c), (f), (a), (b)
Unit 1: Introduction to Chemistry’s Measurement and Problem Solving
Part 5 – Assignment: Unit Conversions
1. 6x10-8 km 2. 45,200 cL 3. 2.56 km 4. 3.21x1014 pm
5. 84,937,000 nL 6. 3.8x1011 mm2 7. 5.7561x10=20 Mm3 8. 5.7x105 dm3
9. 29 m/s 10. 359 lb/ft3 11. 252 g/in2
Unit 1: Introduction to Chemistry’s Measurement and Problem Solving
Part 6 – Assignment: Density and Problem Solving
1. 19.30 g/cm3 2. 226 g 3. 1840 g 4. 5.43 g/cm3
5. 22.5 g/cm3 6. D = 2.50 so not Al 7. yes – same m & V 10. 514 g
Unit 1: Introduction to Chemistry’s Measurement and Problem Solving
Part 7 – Assignment: Accuracy & Precision
3. a. The free-thrower is both accurate and precise.
b. The free-thrower is inaccurate but is precise.
c. The free-thrower is neither accurate nor precise.
4. Lisa is inaccurate and imprecise. Lamont is both accurate and precise. Leigh Ann is
inaccurate but precise.
5. a. 3.102 g b. 0.014g c. 0.46% d. 0.058g e. 1.8%
6. a. 2% b. 2.2% c. 0.19%