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Duplicate of Midterm Review
Duplicate of Midterm Review
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midterm review
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50 cards
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Answers
1
List the elements Sr,Te, Kr, Ru, and Cs in order of increasing ionization energy.
Sr < Te < Ru < Cs < Kr
Cs < Sr < Ru < Te < Kr
Te < Ru < Sr < Cs < Kr
Kr < Cs < Sr < Ru < Te
2
Which sequence represents an increasing level of energy in electromagnetic radiation?
ultraviolet, visible light, X-rays, microwaves
X-rays, ultraviolet, microwaves, visible light
microwaves, visible light, ultraviolet, X-rays
visible light, microwaves, X-rays, ultraviolet
3
The mass of 5.000 mol of cesium is
132.9 g
6.022x1023 g
664.6 g
5.000 g
4
Which particle model diagram represents only one compound composed of elements X and Z?
3
2
1
4
5
Which statement describes a chemical property of iron?
Iron conducts electricity and heat.
Iron combines with oxygen to form rust.
Iron can be drawn into a wire.
Iron can be flattened into sheets.
6
Most of the volume of an atom is occupied in the
nuclides
nucleus
protons
electron cloud
7
The accuracy of a measurement
does not depend on the instrument used to measure the object
indicates that the measurement is also precise.
is something that scientists rarely achieve.
is how close it is to the true value.
8
When an electron is acquired by a neutral atom, the energy is called
electron affinity
electronegativity
electron configuration
ionization energy
9
Recovering the salt from a mixture of salt and water could best be accomplished by
paper chromatography
filtration
density determination
evaporation
10
Which element has the lowest electronegativity?
Te
Ba
O
Be
11
Use VSEPR to predict the shape of the chlorate ion, ClO
3
-1
trigonal pyramid
bent
trigonal planar
octahedral
12
Which change occurs when a barium atom loses two electrons?
It becomes a negative ion and its radius decreases.
It becomes a positive ion and its radius increases.
It becomes a positive ion and its radius decreases.
It becomes a negative ion and its radius increases.
13
Which quantum number is related to the shape of an orbital?
l
m
n
s
14
In the wave-mechanical model, an orbital is a region of space in an atom where there is
a circular path in which electrons are found
a high probability of finding an electron
a high probability of finding a neutron
a circular path in which neutrons are found
15
What are the atomic number and mass number of this atom?
The atomic number is 11 and the mass number is 20.
The atomic number is 11 and the mass number is 19.
The atomic number is 9 and the mass number is 19.
The atomic number is 9 and the mass number is 20.
16
Which block on the periodic table contains the alkali metals?
p
d
s
f
17
The modern model of the atom is based on the work of
one scientist over a long period of time
many scientists over a long period of time
one scientist over a short period of time
many scientists over a short period of time
18
In metals, the valence electrons
form covalent bonds
are attached to particular positive ions
are shared by all the atoms
are immobile
19
A quantum of electromagnetic energy is called a(n)
orbital
excited atom
photon
electron
20
Conductivity in a metal results from the metal atoms having
highly mobile electrons in the valence shell
high electronegativity
highly mobile protons in the nucleus
high ionization energy
21
The bonds between hydrogen and oxygen in a water molecule are classified as
polar covalent
metallic
ionic
nonpolar covalent
22
A substance always has a ratio of 2.67 g of O to 1.0 g of C.What best describes this substance?
heterogeneous mixture
compound
element
homogeneous mixture
23
A polar molecule contains
only London forces
ions
regions of positive and negative charge
no bonds
24
Which sample contains particles in a rigid, fixed, geometric pattern?
HCl(g)
CO2(aq)
H2O(l)
KCl(s)
25
Which historical observation was first used to understand the structure of the atom?
Electrons in H atoms occupy quantized energy levels.
Gases subjected to high voltages show specific behaviors.
Bombarding gold foil with alpha particles scattered them.
Elements combine in varying ratios to produce new compounds.
26
Which of these measurements has only nonsignificant zeros?
400. mL
0.0037 mL
506 mL
60.0 mL
27
Group 17 elements, the halogens, are the most reactive of the nonmetal elements because they
have the largest atomic radii.
have the highest ionization energies.
are the farthest to the right in the periodic table.
require only one electron to fill their outer energy level.
28
Which statement is true about the charges assigned to an electron and a proton?
Both an electron and a proton are negative.
An electron is negative and a proton is positive.
Both an electron and a proton are positive.
An electron is positive and a proton is negative.
29
What is the electron configuration for a germanium(II) ion, Ge
+2
[Ar]4s23d104p4
[Ar]4s23d84p2
[Ar]4s23d10
[Ar]4s23d104p2
30
Which molecule is polar?
a
b
d
c
31
Which of these elements has the least attraction for electrons in a chemical bond?
fluorine
chlorine
bromine
oxygen
32
Which compound contains nonpolar covalent bonds?
O2
NaF
HCl
H2O
33
What is the total number of electrons in an atom of potassium?
19
20
39
18
34
How many orbitals can exist in the fourth main energy level?
32
4
16
2
35
Mg and Ca have similar chemical properties because they have the same number of
neutrons
protons
electron shells
valence electrons
36
Which of the following measurements contains three significant figures?
0.02 mL
200 mL
20.2 mL
200.0 mL
37
The energy of a photon is related to its
size
frequency
speed
mass
38
Which pair of symbols represents a metalloid and a noble gas respectively?
Ne and Xe
Ge and Te
As and Ar
Si and Bi
39
Which statement best describes this diagram of a hydrogen peroxide (H
2
O
2
) molecule?
It is a structural formula.
It is a space filling model.
It is a Lewis Structure.
It is a molecular formula.
40
An atom has seven valence electrons. This atom could be an atom of which element?
calcium
sodium
fluorine
oxygen
41
As the radius of elements in Group 1 increases, what happens to their ionization energy?
It stays the same
It decreases
Don't pick this one
It increases
42
Carbon-14 (atomic number 6), the radioactive nuclide used in dating fossils has
10 neutrons
6 neutrons
14 neutrons
8 neutrons
43
Which statement identifies the element arsenic?
Arsenic has an atomic number of 33.
An atom of arsenic has eight valence electrons.
An atom of arsenic in the ground state has radius of 146 pm.
Arsenic has a melting point of 84 K
44
We know that air is a mixture and not a compound because
it is colorless.
it can be heated to a higher temperature.
its composition can vary.
it can be compressed to a smaller volume.
45
What are the 4 quantum numbers for the circled electron?
2,1,0,+1/2
2,0,1,+1/2
2,1,-1,+1/2
2,1,1,+1/2
46
How many electrons are contained in an Au
3+
ion?
79
197
76
82
47
The set of orbitals that are dumbell shaped and directed along the x,y, and z axis are called
s orbitals
d orbitals
p orbitals
f orbitals
48
Which diagram best represents the Lewis structure for carbon dioxide (CO
2
)?
c
d
b
a
49
Element X is solid, brittle, lacks luster, and has 6 valence e
-
s. What group is it in?
16
2
15
1
50
In comparison to an atom of
19
9
F in the ground state, an atom of
12
6
C in the ground state has
3 more neutrons
3 fewer neutrons
3 more valence electrons
3 fewer valence electrons
