Chem 101 - General Chemistry I » Spring 2021 » Chapter 2 Homework Quiz
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Question #1
J.J. Thompson discovered
A.
the electron
B.
neutons
C.
the proton
Question #2
The nucleus of an atom usually contains ___.
A.
neutrons
B.
protons and neutrons
C.
neither protons nor neutrons
D.
protons
Question #3
The element with atomic number 53 always contains
A.
26 protons and 27 neutrons
B.
26 neutrons and 27 protons
C.
53 neutrons
D.
53 protons
Question #4
The atomic number of an atom is equal to its number of protons.
A.
TRUE
B.
FALSE
Question #5
The element with atomic number 53 is ___.
A.
iron
B.
indium
C.
iridium
D.
iodine
Question #6
The number of protons in an atom is known as its ___.
A.
mass number
B.
atomic mass
C.
molecular mass
D.
atomic number
Question #7
Naturally occurring neon exists as three isotopes. 90.51% is Ne-20 with a mass of 19.99 amu, 0.27% is Ne-21 with a mass of 20.99 amu, and 9.22% is Ne-22 with a mass of 21.99 amu. What is the atomic mass of neon?
A.
20.99 amu
B.
62.97 amu
C.
20.18 amu
D.
10.00 amu
Question #8
CO is made up of ___________ (# of C) which is ________ (element name) and _______ (# of O) which is ______________ (element name)
A.
one, Cobalt, none, oxygen
B.
one, Cadmium, one, oxygen
C.
one, Carbon, one, oxygen
D.
one, Cadmium, one, osmium
Question #9
The formula of a compound that expresses the smallest whole-number ratio of the atoms present is called the empirical formula.
A.
TRUE
B.
FALSE
Question #10
Stereo (or spatial isomers) are considered molecules with ___________
A.
kinds and number of atoms but a different arrangement of these atoms
B.
kinds and number of atoms, with the same connections but a different 3 dimensional arrangement
C.
molecular formula but with a different overall charge
D.
number of electrons and protons but a different number of neutrons
Question #11
Which of the following is a metalloid?
A.
tin
B.
aluminum
C.
iodine
D.
bromine
E.
tellurium
Question #12
The symbol Fe stands for the element
A.
iron
B.
tin
C.
fluorine
D.
francium
E.
fermium
Question #13
The symbol for the element copper is
A.
Cm
B.
Cu
C.
Ce
D.
Cl
E.
C
Question #14
Write the symbol for lead. ______________
A.
Pb
B.
Ld
C.
Le
Question #15
Would K2O be classified as ionic or covalent?
A.
ionic
B.
covalent
Question #16
Ions can be formed from atoms by losing or gaining electrons. Select the alternative that states the correct number of protons, neutrons, and electrons in 3517Cl−1735Cl− .
A.
17 protons, 18 neutrons, 16 electrons
B.
17 protons, 18 neutrons, 18 electrons
C.
18 protons, 17 neutrons, 19 electrons
D.
17 protons, 36 neutrons, 17 electrons
Question #17
The carbonate ion has the formula CO32–. Which of the following is the correct formula for sodium carbonate?
A.
Na3(CO)2
B.
Na2(CO3)2
C.
Na2CO3
D.
NaCO3
Question #18
The total number of ions present in iron(II) carbonate is
A.
2
B.
4
C.
1
D.
3
Question #19
Which of the following formulas is incorrect?
A.
AlBr3
B.
CaNO3
C.
Li2O
D.
MgS
Question #20
A potassium atom is converted to a potassium ion when the atom
A.
loses one electron
B.
loses two electrons
C.
gains one electron
D.
gains two electrons
Question #21
The substance ClO3– is best described as
A.
a polyatomic molecule
B.
a polyatomic ion
C.
a mixture
D.
a molecule
Question #22
The correct formula for ammonium dichromate is
A.
NH4CrO4
B.
NH4(CrO4)2
C.
NH4(Cr2O7)2
D.
(NH4)2Cr2O7
Question #23
Which of the following is the correct formula for diphosphorus hexachloride?
A.
P2Cl6
B.
P4Cl6
C.
P2Cl7
D.
P3Cl6
Question #24
What would the prefix be for the P in the PCl4?
A.
tetra
B.
mono
C.
tri
D.
di
Question #25
The binary compound PCl3 is called _____.
A.
monophosphorus trichloride
B.
phosphorus trichloride
C.
triphosphorus chloride
D.
phosphorus chloride
Question #26
Which compound’s name ends in -ate?
A.
KClO3
B.
KCl
C.
KClO
D.
KClO2
Question #27
The correct formula for hypochlorous acid is _____.
A.
HClO5
B.
HClO
C.
HCl
D.
HClO3
Question #28
HNO3(aq) is named
A.
nitrous acid
B.
hydronitrous acid
C.
hydronitric acid
D.
nitric acid
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