옥스토비 일반화학 5판 해답 #1
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- 2008.12.10
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- 2008.01
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1
CHAPTER 1 - THE ATOMIC NATURE OF MATTER
1-1. Table salt - Heterogeneous mixture of mostly sodium chloride and small amounts of
other substances.
Wood - Heterogeneous mixture of tree cells, themselves mixtures of water and
many thousands of substances.
Mercury - A substance and an element.
Air - Homogeneous mixture of gases.
Water - A substance that is a compound with the molecular formula H2O.
Lemonade (fresh squeezed)- Heterogeneous (because of the pulp from the lemon) mixture of water and
dissolved substances.
Sodium chloride - A substance that is a compound with the formula NaCl.
Ketchup - Heterogeneous mixture of oil, tomato sauce, vinegar (itself a mixture of
water and acetic acid) and seasoning.
1-3. Some examples are: Warm water and a small amount of ice
Liquid in a seltzer bottle right after the bottle is opened
1-5. If the sample is 99.89% Si by mass, then it is 100.00 - 99.89 = 0.11% C by mass. This is equal
to a mass fraction of 0.0011. The mass of C in the 10.0 g sample is then:
mass C = 10.0 g sample 0.11 g C
100 g sample
× = 0.011 g C
1-7. The burning of paper yields many products. A few form the solid ash that remains. But most, in
particular carbon dioxide and water vapor, are gases. They comprise the rest of the mass.
1-9. The law of the conservation of mass says that the mass of the system before reaction must equal
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