Practice Problems 3 Chapter 1 CHE 151
Graham/07
Express all answers in correct scientific notation and significant figures.
1. Convert 2.75 m to each of the following:
a.) mm b.) nm
2.75m x 1 mm = 2.75 x 103mm 2.75m x 1 nm = 2.75 x 109nm
10-3m 10-9m
c.) km d.) m
2.75m x 1 km = 2.75 x 10-3km 2.75m x 1 m = 2.75 x 106m
103m 10-6m
2. Convert 3.4 mg to each of the following:
a.) ng b.) kg
3.4mg x 10-3g x 1ng = 3.4 x 106ng 3.4mg x 10-3g x 1kg = 3.4 x 10-6kg
1mg 10-9g 1mg 103g
c.) cg d.) Mg
3.4mg x 10-3g x 1cg = 3.4 x 10-1cg 3.4mg x 10-3g x 1Mg = 3.4 x 10-9Mg
1mg 10-9g 1mg 106g
3. Convert 5.7 hours to each of the following:
a.) s b.) ms
5.7hrs x 60min x 60s = 2.1 x 104s 2.1 x 104s x 1ms = 2.1 x 107ms
1hr 1min 10-3s
c.) Ms d.) ps
2.1 x 104s x 1Ms = 2.1 x 10-2Ms 2.1 x 104s x 1ps = 2.1 x 1016ps
106s 10-12s
