Transcript
WORKSHEET
(Chapters 1, 2 & 3)
1. Use scientific notation to round 76376.15 to 4 sig. figs. 7.638 x 104
2. Convert 0.0010070 to scientific notation. 1.0070 x 10-3
3. How many significant figures are there in 0.001040? 4
4. Convert 1.002 x 10-3 to decimal form notation. 0.001002
5. Convert 5.65 in3 to cm3 (2.54 cm = 1 in). 92.6
6. Convert 124 g to g and express using scientific notation. 1.24 x 108
7. Convert 158K to °F (3 significant figures) -175
8. Volume (L) of 1.340 kg of a liquid (density = 2.67 g/cm3)? 0.501
9. Fill in the boxes in the table below, giving only the symbol, mass number and charge for the species. Please write all your species in the same form as the example provided.
Species 75As3- 59Ni2+ 127I1- 197Au3+
Protons 33 28 53 79
Neutrons 42 31 74 118
Electrons 36 26 54 76
Net Charge -3 +2 1- 3+
10. A graduated cylinder has a mass of 35.778 g. A student adds 18.651 g of toluene, which has a density of 0.867 g/mL.
(a) What is the volume of toluene in the graduated cylinder? [21.512 mL]
(b) A second student adds an additional 13.661 mL of toluene. What is the new mass of toluene in the cylinder? [30.495 g]
(c) A third student carefully submerges a metal cylinder into the toluene.The measured volume increases by 3.826 mL and the total mass of cylinder and toluene rises to 99.647. What is the density of the metal cylinder?
[8.723 g/mL]
11. A measurement was taken three times. The correct measurement was
68.1 mL. Determine whether each set of the measurements is precise, accurate, neither or both.
(a) 78.1 mL, 43.9 mL, 2 mL?? probably a typo
(b) 68.1 mL, 68.2 mL, 68.0 mL accurate and precise
(c) 98.0 mL, 98.2 mL, 97.9 mL inaccurate, but precise
(d) 72.0 mL, 60.3 mL, 68.1 mL inaccurate and imprecise
12. Determine the volume of the liquids in the following graduated cylinders.
Each tool measures mL.
25.2 36.8 5.49 14.9
13. Naturally occurring europium (Eu) consists of two isotopes with masses of 151 and 153 amu. If the average mass of europium is 151.97 amu, what are the relative abundances of the two isotopes?
[51.5% Eu-151 and 48.5% Eu- 153]
14. Titanium has 3 common isotopes: Ti-46, Ti-47, and Ti-50. If Ti-50 has an abundance of 45.3% and the average atomic mass of titanium is 47.90 amu, calculate the relative abundances of Ti-46 and Ti-47.
[50% Ti-46 and 4.7% Ti-47]
