South Carolina State University
Department of Biological and Physical Sciences
General Chemistry I, C 150, Homework Chapter 2 s05ch2
Show all work
Name:
1. Which of the following statements is not an idea from Dalton's Atomic Theory?
a. An element is composed of extremely small indivisible particles called atoms.
b. All atoms of a given element have identical properties which differ from those of all other elements.
c. Atoms can only be transformed into atoms of another element by nuclear reactions.
d. Compounds are formed when atoms of different elements combine with each other in small whole-number ratios.
e. The relative numbers and kind of atoms are constant in a given compound.
2. Atoms consist principally of what three fundamental particles?
a
.
e
lectrons, positrons, and neutrons
b
.
e
lements, positrons, and neutrons
c
.
e
lements, protons, and neutrons
d
.
e
lectrons, protons, and molecules
e
.
e
lectrons, protons, and neutrons
3. Which of the following statements is incorrect?
a
.
A
molecule is the smallest particle of a compound that can have a stable independent
e
xistence.
b
.
M
olecules that consist of more than one atom are called polyatomic molecules.
c
.
T
he atomic number of an element is defined as the number of neutrons in the nucleus.
d
.
M
olecules of compounds are composed of more than one kind of atom.
e
.
T
he charge on an electron is negative, and the charge on a proton is positive.
4. How many atoms are in a sulfuric acid molecule?
5. If a sample of propane, C3H8, contains a total of 6.0 × 103 atoms of carbon, how many molecules of
propane are in the sample?
6. A compound contains only calcium and fluorine. A sample of the compound is
determined to contain 2.00 g of calcium and 1.90 g of fluorine. According to the Law of Definite Proportions, how
much calcium should another sample of this compound contain if it contains 2.85 g of fluorine?
7. What is the correct classification for SCN-?
8. Each response below lists an ion by name and by chemical symbol or formula. Also each ion is classified
as monatomic or polyatomic and as a cation or anion. Which response contains an error?
a
.
h
ydroxide monatomic anion
b
.
c
arbonate polyatomic anion
c
.
a
mmonium polyatomic cation
d
.
m
agnesium monatomic cation
e
.
s
ulfite polyatomic anion
