Chem 1075 Take Home Problem Set #1 Name_________________________
Due_____________
NOTE: An In-Class Quiz will be at the beginning of class on the due date covering these same concepts.
1. Write the following decimal numbers in scientific (exponential) notation:
a) 63,000,000,000______________ b) 0.00210 ________________ c) 79,000________________
2. Write the following as decimal numbers:
a) 7.52 x 10 9______________ b) 8.3 x 10– 2________________ c) 2.3 x 10–10_________________
3. How many significant figures are in the following measurements?
a) 5.602mm_____ b) 2000km______ c) 45.00miles_____ d) 0.00009Mm____ e) 0.040m_____
4. Round the following numbers to the number of significant digits requested:
The number Rounded to Would be
86039.921935 4 sig figs
532.810358 3 sig figs
60182.031 2 sig figs
0.00492925 3 sig figs
5. Indicate whether the following would be measured or exact numbers:
a) 4 trees__________ b) 79 in__________ c) 2.54 cm in 1 inch__________ d) 72.3mL________
6. Perform the following calculations and express to the proper number of significant figures:
a) 941 x 0.0678 = ______________ b) 65.3134 + 9.54 = _______________
c) 61.00 / 0.09 = __________________ d) 88.78 – 16.48 = _______________
7. Complete the following metric conversions( show set up):
a) Convert 0.955Mg to g:
b) Convert 39.66 L to dg:
c) Convert 13000 cm to pm:
8. How many inches would be in 82.5km? (1 in = 2.54 cm)
9. How many milligrams would be in 4.75lbs? (1 kg = 2.2 lbs)
10. If a 67.32g sample of rock was found to contain 3.45g of iron, what would the %iron be in the rock sample?
11. If water is composed of 88.79% oxygen and 11.21% hydrogen by mass, then how many grams of oxygen are found in 250g of
water? How many grams of hydrogen would be in that same sample of water?
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