CHM113 Calculations in Chemistry
1. Express the following numbers in scientific notation:
a. 43,800
_________________________
b. 0.0000573
_________________________
2. Express the following numbers in standard/ordinary notation:
a. 8.903 x 106
_________________________
b. 4.892 x 10-3
_________________________
3. How many significant figures are in each of the following numbers?
a.
7.4
________
b.
1.40
________
c.
0.072
________
d.
0.1090
________
4. Write the following numbers in scientific notation and tell how many
significant figures are in each number:
a.
557 _______________________
and
________ sig figs
b.
0.064 ______________________
and
________ sig figs
c.
4,300 _______________________
and
________ sig figs
d.
382.0 _______________________
and
________ sig figs
e.
11,800,000 ____________________
and
________ sig figs
f.
0.007 _________________________ and
________ sig figs
5.
Evaluate the following expressions using your calculator and round
your answer to the appropriate number of significant figures.
Express answers scientific notation.
a.
(4.08 x 104)(6.033 x10-1) = ______________________________
b.
(2.03478 x 108)(8.57 x 10-10) = ___________________________
c.
(0.000360)(3.490 x 10-4)(56.45) = _________________________
d.
(851,000)(92,300,000)(27,000) = _________________________
6.
Evaluate each of the following and round the answer to the
appropriate number of significant figures:
a.
17.1+ 0.77 = ____________
b.
47.826 - 9.41 = ____________
c. 12.4 x 5.3 = _____________
d. 1.27 ÷ 3.1416 = _____________
e.
0.072 / 9.46
= _____________
f. (5.82 x 760 x 325) / (725 x 273) = _____________
g. (5.07 x 10-4)(8.51 x 10-2) / 2.9 = _____________