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2020 Chemistry Final Review Flashcards | StudBud
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2020 Chemistry Final Review
2020 Chemistry Final Review
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1
If an atom has a full s and a full p sublevel in its first energy level, how many electrons does it have?
8
10
2
3
2
What is the function of a balanced equation?
all of the above
the amount of products
the amount of reactant
none of th above
3
Two different isotopes of a single element would have the same number of ___ but a different number of ___.
electrons/protons
protons/neutrons
neutrons/protons
protons/ions
4
The measurement 0.005 006 10 m has how many significant digits?
5
8
3
6
5
What type of bond would you expect to form between nitrogen and potassium?
covalent
metallic
ionic
polar covalent
6
An orderly arrangement of ions in a three-dimensional pattern within a compound is called a(n) _____ .
ionic network
formula unit
ion arry
crystal lattice
7
Scientific models may be expressed as _____ .
physical representations
all of these
pictures
mathematical formulas
8
Change 5.02 × 103 to decimal notation.
50,200
502,000
502
5020
9
The official definition of Avogadro's number is based on the number of atoms in exactly 12 g of _____.
nitrogen-14
hydrogen-1
carbon-12
oxygen-16
10
The correct balanced equation is coefficient.
True
False
11
What is the oxidation number of atoms in pure elements?
0
+2
+1
-1
12
What is the correct way to abbreviate milliliter?
Ml
ML
mL
ml
13
In the chemical formula 10Al(C2H3O2)3, the numeral 10 is a _____ .
multiplier
subscript
coefficient
susperscript
14
T/F A naturalistic worldview teaches that matter is all that exists
False
True
15
T/F The scientific method, when used properly, can lead a person to determine absolute truth.
True
False
16
The Greek prefix penta- means _____.
6
5
3
4
17
Helium, neon, argon, krypton, xenon, and radon are all _____.
metalloids
halogens
noble gases
metals
18
Which type of formula typically takes the most time and space to draw?
stoichiometric
structual
molecular
empirical
19
The reaction 4Fe + 3O2 → 2Fe2O3 is a
DECOMPOSITION
reaction.
False
True
20
If the bathroom mirror fogs up while you are in the shower, _____ has occurred.
evaporation
deposition
sublimation
condensation
21
Mendeleev's periodic table arranged elements by _____ .
atomic mass
electronegativity
number of neutrons
atomic number
22
Lithium is in Group 1 of the periodic table, and fluorine is in Group 17. Which has the greater electronegativity?
fluorine
lithium
sulfur
23
The sum of the number of neutrons and the number of protons is known as the _____.
atomic mass
atomic mass unit
atomic number
mass number
24
If an atom loses an electron, the atom will have a ___ charge.
negative
positive
neutral
periodic
25
The measure of an atom's ability to attract electrons to itself in a chemical bond is called _____.
ionization energy
polarity
electronegativity
electron affinity
26
An idea assumed to be true without proof is
a worldview
faith
a presupposition
a theory
27
constitutes 21% of the earth's atmosphere, most abundant element in the earth's crust, essential for animals & humans
hydrogen
sillicon
oxygen
carbon
28
Calculate the mass of 2.50 moles of MgSO4. (molar mass of MgSO4 = 120.38 g)
0.0208 g MgSO_4
48 G MgSO_4
301 g MgSO_4
597 g MgSO_4
29
A(n) _____ system is any system of measurement based on a decimal scale.
accurate
digital
basic
metric
30
The mass of a crystal as measured on a balance would be an example of _____ data
qualitative
subjective
deductive
quantitative
31
Which of the following is the correct value for Avogadro's number?
6.22 X 10^23
6.23 X 10^22
6.022 X 10^23
6.023 X 10^22
32
The _____ states that it is impossible to know both the energy and the exact position of an electron at the same time.
Pauli exclusion principle
law of definite composition
Heisenberg uncertainly princiole
Aufbau Principle
33
T/F Matter is anything that takes up space and has mass.
False
True
34
What is the angle of the bonds in a pure tetrahedral arrangement?
bohrium
beryllium
bromine
boron
35
What is the Lewis structure for ammonia, NH3?
d
a
b
c
36
T/F A theory explains scientific observations.
True
False
37
Niels Bohr proposed the concept of principal energy levels that he envisioned as a set of circular tracks on which ____
isotopes
alpha particles
sublevels
electrons
38
A dash in a Lewis structure represents _____ electron(s).
two
one
unpaired
four
39
T/F A Christian chemist who believes the Bible has a worldview that affects his work.
False
True
40
Units of measurement that come from basic SI units are called
DERIVED
units.
True
False
41
A compound that contains water molecules in its crystalline structure is called a(n) _____.
binary acid
oxyanion
hydrate
anhydrate
42
T/F Mathematically, a conversion factor is equal to zero.
True
False
43
Why do elements in the same family have similar physical and chemical properties?
similar nuclear construction
similar surface area
similar electron configuration
similar electrical charge
44
The type of sublevel found in all principal energy levels is the _____ sublevel.
d
p
s
f
45
What is the only metal that is a liquid at room temperature?
barium
mercury
lithium
magnesium
46
SO4–2 is an _____.
element
ion
isotope
atom
47
In a chemical reaction, the _____ is used up before the others, preventing more products from forming.
limiting reactant
limiting product
excess product
excess reactant
48
Which one of these is not an element symbol?
Ca
CN
C
Cu
49
Who were the first people to propose that matter was made of atoms?
Egyptians
Sumerians
Europeans
Greeks
50
Hydrogen peroxide (H2O2) is a _____ .
diatomic element
compound
polyatomic element
homogeneous mixture
51
Which of the following subatomic particles has the least mass?
nucleon
proton
electron
neutron
52
The name for the chemical formula N2S5 • 3H2O is
DITROGEN PENTASULFIDE TRIHYDRATE
True
False
53
Measure products of a chemical reaction three times and get 1.56 g, 1.59 g, and 1.60 g. The actual mass is 3.62 g. Your
precise but not accurate
both accurate and precise
neither accurate nor precise
accurate but not precise
54
Where can you find the information needed to change grams of a substance to moles?
coefficients
periodic table
oxidation numbers
diagonal rule
55
The disappearance of dry ice left out in a dish is an example of _____.
evaporation
melting
sublimation
condensation
56
Copper, nickel, zinc, platinum, mercury, calcium, and potassium are all examples of _____.
metalloids
nonmetals
halogens
metals
57
The reaction 2NaCl + H2SO4 → Na2SO4 + 2HCl is a
DOUBLE REPLACEMENT
reaction.
True
False
58
The chemical formula for carbon disulfide is Cs_4
True
False
59
What do we call the attraction between opposite electrical charges?
electron sharing
elctrostatic force
electric force
electrical affinity
60
Chemical bonds between atoms involve the rearrangement of _____ to maximize stability.
neutrinos
electrons
protons
neutrons
61
Dry ice has a temperature of 196 K. What is the temperature of dry ice on the Celsius scale?
-71
-95
-77
-92
62
What is the isotopic notation for an atom that has 33 protons, 42 neutrons, and 33 electrons?
top 33 middle X bottom 42
top 75 middle X bottom 33
top 42 middle X bottom 33
top 75 middle X bottom 42
63
A charged atom is called a(n) _____.
mixture
element
ion
isotope
64
Atom becomes more stable by bonding w/ another atom if the resulting electron configuration more like that, what group?
halogens
metalloids
noble gases
alkali metals
65
When balancing a chemical equation, it is usually best to begin with the _____.
simplest molecule
reactants
most complicated molecule
products
66
Perform the following operation, observing significant digits: 7.491 m + 60.2 m + 1.00224 m.
68.693 23m
68.64m
68.7m
68.6m
67
If the atoms below formed a covalent compound, which is most likely to be the central atom?
carbon
nitrogen
oxygen
hydrogen
68
How many hydrogen atoms are in the chemical formula 2H2O?
2
1
4
3
69
The symbol → in an equation means _____.
gets hotter
combines
escapes
yields
70
The _____ represent the number of moles of each substance in a reaction.
coefficients
formulas
oxidation numbers
ions
71
Which principal energy level has both s and p sublevels but no others?
thirdfourth
first
second
72
A negatively charged ion is called a(n)
ANION
.
True
False
73
The amount of matter packed into a given volume determines its _____.
density
ductility
color
mass
74
T/F In measurement, only like units can be added or subtracted.
False
True
75
What type of bond forms as a result of orbitals overlapping end to end?
delta
gamma
sigma
pi
76
An anion composed of oxygen and one other element is called a(n)
OXYANION
.
False
True
77
Chemistry is the study of _____ and the changes that it undergoes.
science
happen
world
matter
78
All of matter can be divided into two categories, pure substances and _____.
sublimation
mixtures
suspensions
impure substances
79
The reaction TiCl4 + 4Na → Ti + 4NaCl is a
SINGLE REPLACEMENT
reaction.
False
True
80
When water vapor forms dew on the grass, ___ has occurred.
condensation
vaporization
evaporation
sublimation
81
The temperature outside is 87 °F. What is the temperature in degrees Celsius?
47
42
35
31
82
Which of the following is a type of qualitative data?
mass
length
temperature
color
83
T/F The nucleus contains almost all of the mass in an atom.
True
False
84
Electron-dot notation is used to represent the
VALENCE
electrons in an atom.
True
False
85
All _____ digits are considered significant in a measurement.
positive
estimated
nonzero
negative
86
These elements are good conductors of heat and electricity and are usually hard, lustrous, malleable, and ductile.
noblegases
halogens
metalloids
metals
87
The halogens form _____ when they combine with metals and _____ when they combine with hydrogen.
salts/acids
oxides/chlorates
metalloids/gases
acids/salts
88
How many significant digits are in 4800 cm?
4
1
3
2
89
One mole of water contains _____ of hydrogen atoms and _____ of oxygen atoms.
one mole/one mole
two moles/one mole
one mole/two moles
two moles/two moles
90
Which state of matter exists in a lit neon sign?
liquid
plasma
quark-gluon plasma
gas
91
The reaction 2AlCl3 → 2Al + 3Cl2 is a
DECOMPOSITON
reaction.
False
True
92
Compounds consisting of one metal and one nonmetal are called _____.
binary covalent compounds
binary acids
binary ionic compounds
polyatomic ionic compounds
93
How many atoms of oxygen are present in 2Al2(SO4)3?
14
8
4
24
94
The name for the chemical formula HCl (aq) is Hydrochloric acid
False
True
95
All scientists approach their work with a certain _____ , which is the perspective from which they see and interpret all
worldview
hypothesis
reasoning
model
96
Significant digits apply only to _____ data.
limited
measured
unmeasured
observed
97
T/F It is improper to multiply two measurements that have different units.
True
False
