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Midterm Review 2022
Midterm Review 2022
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1
How many oxygen atoms are there in Al(OH)
3
1
2
3
6
2
Find the % error of something with an accepted value of 200cm and a measured value of 198cm.
-2%
1%
2%
-1%
3
Which blocks on the periodic table represent the main group elements
f
s, p, and d
s only
s and p
4
of the following elements, which is the least electronegative?
Cl
Co
Se
K
5
Visible light with the shortest wavelength is
blue
red
green
violet
6
The most common form of hydrogen has:
two neutrons
no neutrons
three neutrons
one neutrons
7
The Law of Conservation of Mass states:
Matter cannot be created and it cannot be destroyed.
Matter is not real.
Matter can not be created but it can be destroyed.
matter can be created and destroyed.
8
electronegativity is the ablility of an atom to
conduct an electric current
release electrons
attract electron in a chemical bond
become an ion
9
He arranged elements on the periodic table according to their chemical and physical properties.
Bohr
Cannizaro
Mendeleev
Mosely
10
How many sig figs are there in 0.0062030
5
3
8
4
11
What orbital is shown?
f
s
p
d
12
What does the angular momentum quantum number identify?
energy level
spin
orientation
orbital shape
13
What are the 3 isotopes of Hydrogen?
Deuterium, Protium and Tritium
Chromium, Titanium and Sodium
Francium, Curium and Radium
Carbon, Oxygen and Helium
14
what is Planck's constant?
3x10^8 m/s
3.67x10-9 mi/hr
6.022x10^23
6.626x10^-34 J*s
15
Precision tells you how right your are
True
False
16
Avogadros number is the...
number of protons in one nucleus of a substance
number of grams per mole
number of units/particles in one mole of a substance
number of units in one molecule
17
Which element is represented by the following orbital notation?
Na
Ca
Li
Mg
18
which family tends to have the lowest ionization energy and which family has the highest?
alkali metals; noble gases
alkaline earth metals; halogens
halogens; alkaline earth metals
noble gases; alkali metals
19
What is this number if we take it out of scientific notation: 4.5x10
-4
?
0.00045
45000
45
0.0045
20
when an atom becomes a cation, it
loses electrons and becomes larger
it loses electrons and becomes smaller
gains electrons and becomes smaller
gains electrons and becomes larger
21
Elements are arranged in order of increasing atomic # there is repeating pattern. This is the
Charles' Law
Newton's 2nd Law of Motion
Law of Conservation of Mass
Periodic Law
22
the number of valence electrons in any element in column 17
17
1
7
1+7=8
23
Write the noble gas electron configuration for Ca
[Ar] 3s²
[Ar] 2s²
[Ar] 4s²
[Ar] 5s²
24
What is density's formula?
6.022 x 10^23
d = mx + b
d = v/m
d = m/v
25
Find the molar mass of manganese
55g/mol
54.94g/mol
24g/mol
24.31g/mol
26
A measurement that is accurate is one that:
Contains at least four sig figs
Is close to the true value
Is as exact as possible
Contains five decimal places
27
A phosphorus atom has 15 protons and 16 neutrons. What is this atom's atomic number and mass number?
Atomic number = 31, mass number = 15
Atomic number = 15, mass number = 16
Atomic number = 15, mass number = 31
Atomic number = 16, mass number = 15
28
What is the Energy of a wave with a frequency of 3500 Hz?
35 J
6.626x10-34 J
2.3x10-30 J
5.3x1036 J
29
The oil drop experiment...
Floated oil between charged metal plates
Was performed by Millikan
Was performed by Rutherford
Showed electrons have small mass & negative charge
30
Isotopes of an element have different masses because
different number of electrons
different number of protons
differnet number of neutrons
31
1 mL is equivalent to
1 cm3
1000 L
1 m3
10 cm
32
Which number is the representation of the mass number of the isotope?
63
29
33
Which orbital has 3 orientations?
p orbital
f orbital
s orbital
d orbital
34
What did Rutherford observe in his gold foil experiement
Most alpha particles went thru and a few were deflected
Most alpha particles were deflected
Alpha particles were not used
All alpha particles went straight thru
35
Which is an example of the law of multiple proportions?
CO and H2O
CO and CH4
CO and CO2
CO and C2H4
36
Density in an experiment was found to be 86 g/cm
3
. The actual density was 78 g/cm
3
. What is the percent error?
6 g/mL
10%
8%
12%
37
In oxides of nitrogen, such as N
2
O, NO, and NO
2
, atoms combine in small whole-number ratios. This supports which law?
law of conservation of mass
law of definite proportions
law of gravity
law of multiple proportions
38
Which has the larger radius
Mg
Mg+
39
Which element has an electron conf of 1s
2
2s
2
2p
6
3s
2
3p
5
?
I
Br
Cl
F
40
As you move from left to right from Gallium to bromine, atomic radii _______
generally decrease
does not change
generally increases
vary unpredictably
41
The valence electrons in an atom are always
the outermost electrons
the innermost electrons
inside the nucleus
in s orbitals
42
The atomic mass of an element is
a ratio based on the mass of a carbon-12 atom
a weighted average of the masses of an element's isotopes
twice the number of protons in one atom of the element
the sum of protons and neutrons in one atom of the element
43
Identify the element that has the electron orbital notation pictured here?
Br
I
P
F
44
Mass Number is
e- + p
p+ + n0
n0 - p+
n0 + e-
45
What was discovered in the cathode ray experiment?
Electrons
Protons
Neutrons
46
For which element would you expect a large jump between the second and third ionization energy?
S
Sr
Rb
Nd
47
Write this atom in dash or hyphen notation
None of the above
Boron - 6
Boron - 5
Boron - 11
48
The Aufbau principle states that...
Electrons must be paired with opposite spins.
Every orbital on an energy level needs an electron.
The lowest available energy level is filled first.
49
Which of the following has the largest Radius?
arsenic
silicon
germanium
tin
50
The mass number of aluminum-25 is 26.
True
False
51
The Carbon-12 atom is assigned a relative mass of exactly 12.00 amu
False
True
52
What is a valence electron?
Dirt on my socks
tat las pee on mi plat
Rims on my moms Mini Cooper
An electron that is in the outermost valence shell
53
electrons can exist in between energy levels
True
False
54
What is the Law of Definite Proportions?
Elements can combine in more than one way to form compounds
Elements combine in the same ratio by mass to form compounds
Matter is neither created nor destroyed in a chem reaction
55
what is scientific notation
.78x10^-12
A shorthand way of writing very large or very small numbers.
the variation in numbers
describes a difference
56
How many centuries are there in 4500 seconds?
1.4x10-6
1400000000
1.0x10-6
14191200000
57
Beryllium has what electron configuration?
1s2 2s2 3s2
1s1 2s2
1s2 2s2 2p5
1s2 2s2
58
neutral atoms with an s
2
p
6
electron configuration in the highest energy level are
metals
nonmetals
gases
metalloids
59
what is the formula for calculating Energy
E=λ/v
c=λv
E=h/v
E=(h)(v)
60
Protons within a nucleus are attracted to each other by
their energy levels.
opposite charges.
nuclear forces.
electron repulsion.
61
Hyphen notation indicates the...
Atomic Weight
Atomic number
Mass number
Atomic mass
62
Rachel thinks her dog is 35lbs. The dog is actually 36lbs. What is the percent error?
28.6%
27.8%
2.8%
2.7%
63
A quantum is the minimum amount of energy that can be gained or lost by an atom.
True
False
64
Speed = wavelength X _________
Hertz
Speed
Wavelength
Frequency
65
to find the wavelength of a wave, what formula would i use?
C=hv
c=λv
c=λ/v
66
All of the following are SI units for density except
g/mL
g/cm3
kg/m3
g/m2
67
The Pauli exclusion principle states
Each orbital of equal energy is filled with 1 electron 1st
Only one electron fits per orbital
Two electrons must have opposite spin in same orbital
Lower energy levels fill first
68
The elements in column 1 of the period table are called the ___________ .
alkaline earth metals
noble gases
alkali metals
halogens
69
What is the quantity .0075 meters expressed in centimeters?
.75cm
7.5 cm
70.5 cm
.075 mc
70
What does the magnetic quantum number identify?
spin
orbital shape
energy level
orientation
71
no two electrons in an atom can have the same set of quantum numbers
Heisenberg uncertaintly principle
Pauli exclusion principle
Aufbaugh principle
Hund's rule
72
What is Avogadros Number?
6.022 x 1023
6.022 x 1024
6022 x 1022
73
Convert to scientific notation:
35 x 10-5
3.5 x 104
3.5 x 10-4
35 x 105
74
What are the units for mass
liters
Kelvin
meters
grams
75
Which has the shortest wavelength?
Gamma ray
X-ray
ultraviolet
Radio
76
How many atoms are in 8.7 g of Calcium?
1.3x1023atoms
5.2x1024 atoms
2.1x1026 atoms
1.31x1023 atoms
77
Nonmetals have
low Ionization energy and high electronegativity
low Ionization energy and low electronegativity
High Ionization energy and low electronegativity
High Ionization energy and high electronegativity
78
What is wavelength?
Distance between one point on a wave and the exact same place on the next.
How far the medium particles move from rest position.
A wave
The length of a wave..
79
Find the average atomic mass: 31% C-14, 28% C-12, 41% C-11
12.90 amu
12.21 amu
38 amu
4.07 amu
80
As the wavelength increases a wave’s frequency will ______.
stay the same
increase
decrease
go boom
81
This scientist rearranged the Periodic Table based on atomic number
Mosely
Cannizzaro
Rutherford
Mendeleev
82
Sodium has 11 protons, 12 neutrons and 11 electrons. What is it's mass number?
11
23
12
22
83
Which element has the following noble gas notation?
iodine (I)
antimony (Sb)
strontium (Sr)
cadmium (Cd)
84
Who performed the famous gold foil experiment?
Dalton
Thomson
Bohr
Rutherford
85
Atomic theory was proposed by Dalton
True
False
86
Hund's Rule...
the answer is not there
singly occupied with 1 electron before a 2 electron is added
occupy every orbital with 2 as you go
87
How many zeros are significant in 0.0020360
2
3
5
none
88
Round 866 to 2 significant figures:
800
900
860
870
89
which is high precision but low accuracy
a
d
b
c
90
Pauli Exclusion Principle States?
Electrons fill orbitals starting at the lowest available energy state
None of the above
An orbital can hold a maximum of 2 electrons
Electrons are placed in individual orbitals before they are paired up.
91
As the mass number of an element's isotopes increases, the number of protons _________.
doubles
increases
decreases
remains the same
92
Elements in which the d-sublevel is being filled have the properties of
gases
nonmetals
metalloids
metals
93
What are the units for volume
Kelvin
meters
liters
grams
94
The elements in group 17 on the periodic table are called
halogens
alkaline earth metals
noble gases
alkali metals
95
What does the principle quantum number identify?
Orientation
Orbital Shape
Energy Level
Spin
96
There are 40 kilometers in 4000 meters
True
False
