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Chemistry Semester 1 Review Flashcards | StudBud
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Chemistry Semester 1 Review
Chemistry Semester 1 Review
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Review for semester exam for Chem 1
Flashcards
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Questions
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Answers
1
If aluminum has a density of 2.70 g/cc and a volume of 1.50 cc, what is the mass of aluminum?
2.7 g
1.8 g
1.5 g
4.05 g
2
Which of the following does not describe why atoms are electrically neutral?
net charge of zero
Same number of protons and neutrons
Same number of protons and electrons
none of the above
3
As it travels through space, electromagnetic radiation
exhibits wavelike behavior
varies in speed
releases photons
loses energy
4
Which one is a chemical property?
boiling point
texture
reactivity
density
5
How many Sig Figs are in 0.000305?
3
5
4
6
6
Which electron configuration is most stable?
3d44s2
3d54s1
3d34s3
3d24s4
7
How many more electrons does nitrogen need to satisfy the octet rule?
5
3
8
1
8
Energy required to remove an electron from an atom
electronegativity
ionization energy
none of the above
electron affinity
9
In the electron sea model of a metallic bond,
electrons are stationary
electrons are bonded to particular positive ions
some electrons are valence electrons and some are not
mobile electrons are shared by all the atoms
10
For an electron in an atom to change from the ground state to an excited state,
energy must be released
energy must be absorbed
the electron must transition from a higher to a lower level
radiation must be emitted
11
Atoms are _______ when they are combined.
at a high potential energy
less stable
not bound together
more stable
12
The element that has the greatest electronegativity is
F
Cl
Na
O
13
Which of the following does not describe an isotope?
Same element
Same number of electrons
Different number of protons
Different number of neutrons
14
If both the s and p orbitals are filled, how many electrons are there?
18
8
2
6
15
The number of possible orbital shapes for the third energy level is
2
3
1
4
16
The energy required to remove an electron from an atom _ as you move left to right from K to Fe
generally decreases
generally increases
does not change
varies unpredictably
17
This branch of chemistry is concerned with identification and composition of materials.
Organic Chemistry
Biochemistry
Analytical Chemistry
Inorganic Chemistry
18
Which of the following is NOT an example of a molecular formula?
NH3
O2
B
H20
19
For groups 1, 2, and 18 the atomic # of the 4th element in the group is _ more than the 3rd.
4
20
3
18
20
Density = ?
mass divided by area
mass x volume
mass divided by volume
volume divided by mass
21
If the s and p sublevels of the highest main energy level are filled, how many e
-
in that level
8
2
32
16
22
If EMR B has a lower frequency than EMR C, then the wavelength of B when compared to C is ___?
equal
longer
shorter
exactly half of C
23
Mass of a neutron
None of the above
1 g
1 amu
1 neutrino
24
For each successive electron removed from an atom, the ionization energy
decreases
increases
remains the same
shows no pattern
25
The B-F bond in BF
3
is ___. (Electronegativity of B = 2.0, F = 4.0).
pure covalent
polar covalent
ionic
nonpolar covalent
26
1st member of the noble gas family whose highest energy level consists of an octet of electrons
Argon
Krypton
Helium
Neon
27
The ions in an ionic compound are organized into a(n) ____.
polyatomic ion
Lewis structure
crystal
molecule
28
Which quantum number indicates the main energy level?
Spin
Magnetic
Angular momentum
Principal
29
A polar molecule contains
no bonds
a region of positive charge and a region of negative charge
ions
only London forces
30
What is the overall charge of an ionic compound?
None of the above
-1
+1
0
31
The most characteristic property of the noble gases is that they
are gases at ordinary temperatures
are radioactive
are largely unreactive
have low boiling points
32
Shape of p orbitals
ring
dumbbell
sphere
none of the above
33
If 0.12 g, 1.8 g, & 0.562 g are added together, what is the combined mass with correct Sig Figs
2.5 g
2.48 g
2.4 g
2.482 g
34
Which of the following is not an SI unit?
kilogram
second
Kelvin
liter
35
Nonpolar covalent bonds are not common because ________.
ions always form when atoms join
electrons usually remain equally distant from both atoms
dipoles are rare in nature
one atom usually attracts electrons more strongly
36
The statement that an electron occupies the lowest available energy orbital is
the Aufbau principle
the Pauli exclusion principle
Hund's rule
Bohr's law
37
Argon, krypton, and xenon are all
Halogens
Noble gases
Alkalis
Transition elements
38
Which state of matter has particles that are held in a fixed position?
plasma
solid
gas
liquid
39
Electron occupies the lowest energy level
Hund's rule
Aufbau principle
None of the above
Pauli exclusion principle
40
The atomic # of O is 8. The atomic # of Cr is 24. Compared with a mole of O, a mole of Ca has
3 times as many atoms
an equal number of atoms
half as many atoms
20 times as many atoms
41
The state of matter in which a material has a definite volume but no definite shape
solid state
liquid state
gaseous state
frozen state
42
The mass of 3 moles of oxygen atoms (atomic mass = 16 amu) is ____.
64 g
32 g
16 g
48 g
43
A quantity that describes concentration of matter is ______?
mass
volume
weight
density
44
A spherical electron cloud would represent which orbital?
d
p
s
f
45
The study of substances containing carbon is ______?
Organic Chemistry
Analytical Chemistry
Inorganic Chemistry
Biochemistry
46
Negative ion
anion
none of the above
proton
cation
47
Which of the following is an intensive physical property?
volume
length
color
density
48
To which group do lithium and potassium belong?
alkali metals
noble gases
transition metals
halogens
49
Chemical properties
include mass and color
include changes of state of a substance
include changes that alter the identity of a substance
can be observed without altering the identity of a substance
50
Chemical changes
include changes that alter the identify of a substance.
include changes of state of a substance.
include mass and color.
can be observed without altering the identify of a substance
