Worksheet #2 Chem 110 New Book
1. Express the following number in scientific notation:
145,000,000,000 =
34,000 =
0.000067 =
0.00335 =
2. Perform the following calculations and write the answer with
the proper number of significant figures (digits).
(3.5 x 10^{-4})(2.4 x 10^{5}) =
(2.733 x 10^{9})(5.7 x 10^{4}) =
4 x 10^{4}
-------- =
2 x 10^{-2}
3. What fraction of a liter (L) is a milliliter (mL)?
4. How many grams of water are contained in a kilogram of water?
5. Calculate the density of a liquid if 25 mL of the liquid has a
mass of 35 g.
6. What is the weight in newtons of a small apple having a weight
of 0.25 lb?
7. How much energy in joules (J) is required to lift the apple
described in #6 one meter high?
8. If two objects having different temperatures are places in
contact with each other, what is likely to happen?
9. Suppose you would like to heat 1.0 L of water in a pot from 25 ^{°}C
(room temperature) to 96 ^{°}C. Calculate the amount of heat in joules (J)
necessary to do this.
10. Suppose you are heating the water described in #9 using a gas
stove. Calculate the amount of natural gas in cubic feet that
must be burned to heat the water assuming that the burning on one
cubic foot of natural gas produces 10^{6} J of heat.
11. Perform the following conversions:
1.000L = ___________ mL
27.5 mL = ___________ L
1.83 mg = ___________ g
20.0 kg = ___________ mg
5.0 fl oz = ___________ mL (Note: 355 mL = 12.00 fl oz)
1.0 L H_{2}O = ___________ g H_{2}O
34 g H2SO4 = ___________ mL H_{2}SO_{4}
(Note:density of H_{2}SO_{4} is 1.84 g/mL)