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Honors Chem Midterm Review
Honors Chem Midterm Review
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midterm review
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Answers
1
Which pair of symbols represents a metalloid and a noble gas respectively?
As and Ar
Ge and Te
Ne and Xe
Si and Bi
2
The mass of 5.000 mol of cesium is
664.6 g
5.000 g
6.022x1023 g
132.9 g
3
A substance always has a ratio of 2.67 g of O to 1.0 g of C.What best describes this substance?
element
compound
homogeneous mixture
heterogeneous mixture
4
A quantum of electromagnetic energy is called a(n)
excited atom
orbital
electron
photon
5
Which element has the lowest electronegativity?
Be
Ba
O
Te
6
Which sample contains particles in a rigid, fixed, geometric pattern?
KCl(s)
CO2(aq)
HCl(g)
H2O(l)
7
Element X is solid, brittle, lacks luster, and has 6 valence e
-
s. What group is it in?
16
2
15
1
8
We know that air is a mixture and not a compound because
it is colorless.
it can be compressed to a smaller volume.
it can be heated to a higher temperature.
its composition can vary.
9
Which of these measurements has only nonsignificant zeros?
506 mL
60.0 mL
0.0037 mL
400. mL
10
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 decreases.
It becomes a positive ion and its radius increases.
It becomes a negative ion and its radius increases.
11
The modern model of the atom is based on the work of
many scientists over a long period of time
many scientists over a short period of time
one scientist over a long period of time
one scientist over a short period of time
12
Which particle model diagram represents only one compound composed of elements X and Z?
2
3
4
1
13
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 fewer valence electrons
3 more valence electrons
14
Mg and Ca have similar chemical properties because they have the same number of
electron shells
neutrons
protons
valence electrons
15
What is the total number of electrons in an atom of potassium?
18
19
39
20
16
An acceptable reading (to the correct number of sig figs) would be
35 mL
36 mL
35.5 mL
35.55 mL
17
What are the 4 quantum numbers for the circled electron?
2,1,1,+1/2
2,0,1,+1/2
2,1,0,+1/2
2,1,-1,+1/2
18
Recovering the salt from a mixture of salt and water could best be accomplished by
evaporation
density determination
filtration
paper chromatography
19
Conductivity in a metal results from the metal atoms having
high electronegativity
highly mobile electrons in the valence shell
highly mobile protons in the nucleus
high ionization energy
20
This piece of lab equipment is known as a
mortar and pestle
evaporating dish
graduated cylinder
clamp
21
Which historical observation was first used to understand the structure of the atom?
Elements combine in varying ratios to produce new compounds.
Gases subjected to high voltages show specific behaviors.
Electrons in H atoms occupy quantized energy levels.
Bombarding gold foil with alpha particles scattered them.
22
How many electrons are contained in an Au
3+
ion?
79
82
76
197
23
An atom has seven valence electrons. This atom could be an atom of which element?
oxygen
sodium
calcium
fluorine
24
The set of orbitals that are dumbell shaped and directed along the x,y, and z axis are called
s orbitals
p orbitals
f orbitals
d orbitals
25
Which sequence represents an increasing level of energy in electromagnetic radiation?
visible light, microwaves, X-rays, ultraviolet
microwaves, visible light, ultraviolet, X-rays
ultraviolet, visible light, X-rays, microwaves
X-rays, ultraviolet, microwaves, visible light
26
In the wave-mechanical model, an orbital is a region of space in an atom where there is
a high probability of finding an electron
a circular path in which electrons are found
a circular path in which neutrons are found
a high probability of finding a neutron
27
The accuracy of a measurement
is something that scientists rarely achieve.
is how close it is to the true value.
indicates that the measurement is also precise.
does not depend on the instrument used to measure the object
28
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 20.
The atomic number is 9 and the mass number is 19.
29
Which of the following measurements contains three significant figures?
200 mL
200.0 mL
20.2 mL
0.02 mL
30
The energy of a photon is related to its
frequency
mass
speed
size
31
Which statement identifies the element arsenic?
An atom of arsenic has eight valence electrons.
An atom of arsenic in the ground state has radius of 146 pm.
Arsenic has an atomic number of 33.
Arsenic has a melting point of 84 K
32
List the elements Sr,Te, Kr, Ru, and Cs in order of increasing ionization energy.
Kr < Cs < Sr < Ru < Te
Te < Ru < Sr < Cs < Kr
Cs < Sr < Ru < Te < Kr
Sr < Te < Ru < Cs < Kr
33
Which block on the periodic table contains the alkali metals?
s
f
d
p
34
Most of the volume of an atom is occupied in the
nucleus
protons
nuclides
electron cloud
35
Which statement is true about the charges assigned to an electron and a proton?
Both an electron and a proton are negative.
Both an electron and a proton are positive.
An electron is negative and a proton is positive.
An electron is positive and a proton is negative.
36
When an electron is acquired by a neutral atom, the energy is called
electron affinity
electron configuration
ionization energy
electronegativity
37
How many orbitals can exist in the fourth main energy level?
2
32
4
16
38
Which quantum number is related to the shape of an orbital?
n
l
m
s
39
Group 17 elements, the halogens, are the most reactive of the nonmetal elements because they
have the highest ionization energies.
have the largest atomic radii.
are the farthest to the right in the periodic table.
require only one electron to fill their outer energy level.
40
In the lab, if glass is broken it should be placed in
the garbage
the recycling bin
the hall
broken glass container
41
An emission spectrum
is a discontinuous spectrum
all of the above
has bands of color at specific wavelengths
is different for every element
42
Which statement describes a chemical property of iron?
Iron can be drawn into a wire.
Iron can be flattened into sheets.
Iron conducts electricity and heat.
Iron combines with oxygen to form rust.
43
Carbon-14 (atomic number 6), the radioactive nuclide used in dating fossils has
10 neutrons
8 neutrons
14 neutrons
6 neutrons
44
As the radius of elements in Group 1 increases, what happens to their ionization energy?
It stays the same
It decreases
It increases
Don't pick this one
