Chapter 3 Self-Test Questions
1. Rewrite these measurements in scientific notation:
a) 0.000758 ______________
b) 4,573,000 ______________
c) 0.3438 ________________
2. Give the number of significant figures in these measurements.
a) 0.042 L __________
b) 78.00 m _________
c) 320 g ____________
3. Round off the following numbers correctly.
a) Round off 8670 km to two significant figures _____________
b) Round off 0.01025 m to three sig. figs. ___________
c) Round off 7.013 g to three sig. figs. __________
d) Round off 0.003629 mm to three sig. figs. __________
4. List and define the SI prefixes you are required to memorize (p. 74).
5. Express 1.45 x 108 pm in mm.
6. Calculate the density of an 18.0g sample of a piece of metal has a volume of 3.2 mL. Give answer with correct units and sig. figs.
7. A sample of limestone is 25.3 % calcium, 30.3% oxygen and 7.4% carbon by mass. The rest is just “stuff,” that we are not interested in. A student finds a certain lump of this limestone has a mass of 275.6g.
a) Calculate the mass of calcium, oxygen and carbon in the limestone.
b) Calculate the mass of “stuff.”
