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WorksheetsChemistry Exam Review
Total questions: 80
Worksheet time: 2hrs 22mins
The diameter of a carbon atom is 0.000 000 000 154 m. What is this number expressed in scientific notation?
1.54 x 10¹² m
1.54 x 10⁻¹² m
1.54 x 10¹⁰ m
1.54 x 10⁻¹⁰ m
Which of the following measurements contains two significant figures?
0.00400 L
0.00404 L
0.00044 L
0.00440 L
Which of the following is NOT a physical property of water?
It has a boiling point of 100°C.
It is a colorless liquid.
It is composed of hydrogen and oxygen.
Sugar dissolves in it.
Which of the following is a physical change?
oxidation
explosion
evaporation
rotting of food
Which of the following CANNOT be classified as a pure substance?
sodium chloride
air
nitrogen
gold
Which of the following is a heterogeneous mixture?
salt water
air
sand and water
bronze
Which of the following is a homogeneous mixture?
salt water
chicken noodle soup
sand and water
soil
Which of the following is a chemical property?
color
hardness
freezing point
ability to react with oxygen
What must occur for a change to be a chemical reaction?
There must be a change in chemical properties.
There must be a change in physical properties.
The change must involve a change in mass.
The change must involve a change in volume.
What happens to matter during a chemical reaction?
Matter is neither destroyed or created.
Some matter is destroyed.
Some matter is created.
Some matter is destroyed and some is created.
The particles that are found in the nucleus of an atom are ____.
neutrons and electrons
electrons only
protons and neutrons
protons and electrons
What does the number 84 in the name krypton-84 represent?
the atomic number
the mass number
the sum of the protons and electrons
twice the number of protons
In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly?
Li; 3 protons, 9 electrons
Zn; 30 protons, 30 electrons
Cs; 55 protons, 132.9 electrons
F; 19 protons, 19 electrons
How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain (ordered respectively)?
50 protons, 50 electrons, 75 neutrons
75 electrons, 50 protons, 50 neutrons
120 neutrons, 50 protons, 75 electrons
70 neutrons, 75 protons, 50 electrons
If E is the symbol for an element, which two of the following symbols represent isotopes of the same element?
1 and 2
3 and 4
1 and 4
2 and 3
In the Bohr model of the atom, an electron in an orbit has a fixed ____.
position
time
energy
size
How does the energy of an electron change when the electron moves closer to the nucleus?
It decreases.
It increases.
It stays the same.
It doubles.
The principal quantum number indicates what property of an electron?
number of electrons in a sublevel
speed
energy level
electron cloud shape
What is the shape of the 3p atomic orbital?
sphere
dumbbell or figure 8
bar
clover leaf
What is the maximum number of electrons in the second principal energy level?
2
8
18
32
What types of atomic orbitals are in the third principal energy level?
s and p only
p and d only
s, p, and d only
s, p, d, and f
According to the Aufbau principle, ____.
an orbital may be occupied by only two electrons
electrons in the same orbital must have opposite spins
electrons enter orbitals of highest energy first
electrons enter orbitals of lowest energy first
What is the electron configuration of potassium?
1s² 2s² 2p² 3s² 3p² 4s¹
1s² 2s² 2p¹⁰ 3s² 3p³
1s² 2s² 3s² 3p⁶ 3d¹
1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
If three electrons are available to fill three empty 2p atomic orbitals, how will the electrons be distributed in the three orbitals?
one electron in each orbital (↑ )(↑ )(↑ )
two electrons in one orbital, one in another, none in the third (↑ ↓ )( ↑ )( )
three in one orbital, none in the other two (↑↑↑ )( )( )
Three electrons cannot fill three empty 2p atomic orbitals.
Stable electron configurations are likely to contain ____.
filled energy sublevels
fewer electrons than unstable configurations
unfilled s orbitals
electrons with a clockwise spin
Which scientist was primarily responsible for the development of the quantum mechanical model of the atom?
Albert Einstein
Erwin Schrodinger
Niels Bohr
Ernest Rutherford
The quantum mechanical model of the atom ____.
defines the exact path of an electron around the nucleus
was proposed by Niels Bohr
involves the probability of finding an electron in a certain position
involves the probable location of Scott Bakula
Which of the following elements is in the same period as phosphorus?
carbon
magnesium
nitrogen
oxygen
Each period in the periodic table corresponds to ____.
a principal energy level
an energy sublevel
an orbital
a suborbital
The modern periodic table is arranged in order of increasing atomic ____.
mass
charge
number
radius
Who arranged the elements according to atomic mass and used the arrangement to predict the properties of missing elements?
Henry Moseley
Antoine Lavoisier
John Dalton
Dmitri Mendeleev
Of the elements Pt, V, Li, and Kr, which is a nonmetal?
platinum; Pt
vanadium; V
lithium; Li
krypton; Kr
Which subatomic particle plays the greatest part in determining the chemical reactivity of an element?
proton
electron
neutron
isotope
To what category of elements does an element belong if it is a poor conductor of electricity?
transition metals
metalloids
noble gases
alkaline earth metals
Which of the following elements is a transition metal?
carbon
copper
tellurium
rubidium
Which of the following statements is true about ions?
Cations form when an atom gains electrons.
Cations form when an atom loses electrons.
Anions form when an atom gains protons.
Anions form when an atom loses protons.
The metals in Groups 1A, 2A, and 3A ____.
gain electrons when they form ions
all form ions with a negative charge
gain protons when they form ions
lose electrons when they form ions
Which of the following occurs in an ionic bond?
Oppositely charged ions attract.
Two atoms share two electrons.
Two atoms share more than two electrons.
Like-charged ions attract.
How many valence electrons are transferred from the calcium atom to both fluorine atoms in the formation of the compound calcium fluoride, CaF₂?
0
2
1
3
What is the correct formula unit of sodium nitride?
NaN
Na₂N
Na₃N
NaNO₂
What is the name of the ionic compound formed from lithium and bromine?
lithium bromine
lithium bromide
lithium bromium
lithium bromate
Which of these elements does not exist as a diatomic molecule?
Ne
F
H
Br
Which set of chemical name and chemical formula for the same compound is correct?
aluminum fluoride, AlF₃
iron(II) oxide, Fe₂O₃
tin(II) bromide, SnBr₄
potassium chloride, K₂Cl₂
Which set of chemical name and chemical formula for the same compound is correct?
ammonium sulfite, (NH₄)₂S
lithium carbonate, LiCO₂
magnesium dichromate, MgCrO₄
iron(III) phosphate, FePO₄
Why do atoms share electrons in covalent bonds?
to become ions and attract each other
to attain a noble-gas electron configuration
to become more polar
to increase their atomic numbers
According to VSEPR theory, molecules adjust their shapes to keep which of the following as far apart as possible?
pairs of valence electrons
inner shell electrons
mobile electrons
the electrons closest to the nuclei
According to VSEPR theory, the structure of the ammonia molecule, NH₃, is:
trigonal-planar
bent
trigonal-pyramidal
tetrahedral
Use VSEPR theory to predict the shape of the methane molecule, CH₄.
tetrahedral
linear
bent
trigonal-planar
Use VSEPR theory to predict the shape of the water molecule, H₂O.
trigonal-planar
octahedral
trigonal-pyramidal
bent
Use VSEPR theory to predict the shape of carbon dioxide, CO₂.
tetrahedral
linear
bent
octahedral
Which of the following formulas represents a molecular compound?
ZnO
Xe
SO₂
BeF₂
What is the correct name for the compound Co(ClO₃)₂?
cobalt(I) chlorate
cobalt(I) chloride
cobalt(II) chlorate
cobalt(II) chloride
Which of the following is the correct name for N₂O₅?
nitrous oxide
dinitrogen pentoxide
nitrogen dioxide
nitrate oxide
Avogadro's number (6.02 x 10²³) of representative particles is equal to one ____.
kilogram
gram
kelvin
mole
How many moles of silver atoms are in 1.8 x 10²⁴ atoms of silver?
3.0 x 10⁻⁴
3.0 x 10⁻¹
3.0
1.1 x 10⁴⁴
How many molecules are in 2.10 moles CO₂?
2.53 x 10²⁴ molecules
3.49 x 10²⁴ molecules
3.79 x 10⁻²⁴ molecules
1.26 x 10²⁴ molecules
What is the mass in grams of 5.90 moles C₈H₁₈?
0.0512 g
19.4 g
389 g
674 g
What is the percent composition of chromium in BaCrO₄?
4.87%
9.47%
20.5%
25.2%
What is the empirical formula of a compound that is 40% sulfur and 60% oxygen by weight?
SO
SO₂
SO₃
SO₄
The molecular mass of a compound is 92.0 g/mol and its empirical formula is NO₂. What is the molecular formula of the compound?
NO₂
NO
NO₃
N₂O₄
A chemical equation is balanced when the:
coefficients of the reactants equal the coefficients of the products.
same number of each kind of atom appears in the reactants and in the products.
products and reactants are the same chemicals.
subscripts of the reactants equal the subscripts of the products.
What are the coefficients (ordered correctly) that will balance the following skeleton equation? __AlCl₃ + __Na(OH) → __Al(OH)₃ + __NaCl
1, 3, 1, 3
3, 1, 3, 1
1, 1, 1, 3
1, 3, 3, 1
When potassium hydroxide and barium chloride react, potassium chloride and barium hydroxide are formed. The balanced equation for this reaction is ____.
KH + BaCl → KCl + BaH
KOH + BaCl → KCl + BaOH
2KOH + BaCl₂ → 2KCl + Ba(OH)₂
KOH + BaCl₂ → KCl₂ + BaOH
In order for the following reaction to occur, which of the following must be true? 2Al + 6HCl → 2AlCl₃ + 3H₂
Al must be above Cl on the activity series.
Al must be above H on the activity series.
Heat must be supplied for the reaction.
A precipitate must be formed.
In a combustion reaction, one of the reactants is ____.
hydrogen
nitrogen
oxygen
a metal
The type of reaction that takes place when one element reacts with a compound to form a new compound and a different element is a ____.
synthesis reaction
decomposition reaction
single-replacement reaction
double-replacement reaction
The complete combustion of which of the following substances produces carbon dioxide and water?
C₈H₁₈
K₂CO₃
CaHCO₃
NO
The following equation is an example of which type of chemical reaction? 2Fe + 3Cl₂ → 2FeCl₃
combustion reaction
single-replacement reaction
synthesis reaction
decomposition reaction
What is the correct order of the missing coefficients for the skeleton equation below? __Cr(s) + __Fe(NO₃)₂(aq) → __Fe(s) + __Cr(NO₃)₃(aq)
4, 6, 6, 2
2, 3, 2, 3
2, 3, 3, 2
1, 3, 3, 1
What are the coefficients that will balance the skeleton equation below? __N₂ + __H₂ → __NH₃
1, 1, 2
1, 3, 3
3, 1, 2
1, 3, 2
The following equation is an example of which type of reaction? Mg + 2HCl → MgCl₂ + H₂
synthesis reaction
single-replacement reaction
decomposition reaction
double-replacement reaction
The equation 2Na₃PO₄ + 3Pb(NO₃)₂ → 6NaNO₃ + Pb₃(PO₄)₂ is an example of which type of reaction?
double-replacement reaction
synthesis reaction
decomposition reaction
single-replacement reaction
In the reaction 2CO + O₂ → 2CO₂, what is the ratio of moles of oxygen used to moles of CO₂ produced?
1:1
2:1
1:2
2:2
How many moles of aluminum are needed to react completely with 1.2 mol of FeO? 2Al(s) + 3FeO(s) → 3Fe(s) + Al₂O₃(s)
1.2 mol
0.80 mol
1.6 mol
2.4 mol
Calculate the number of moles of Al₂O₃ that are produced when 0.60 mol of FeO reacts with 0.60 mol Al in the following reaction. 2Al(s) + 3FeO(s) → 3Fe(s) + Al₂O₃(s)
0.20 mol
0.30 mol
0.50 mol
0.60 mol
Iron(III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe₂O₃ are formed when 16.7 g of Fe reacts completely with oxygen? 4Fe(s) + 3O₂(g) → 2Fe₂O₃(s)
12.0 g
23.9 g
47.8 g
95.6 g
The equation below shows the decomposition of lead nitrate. How many grams of oxygen are produced when 11.5 g NO₂ is formed? 2Pb(NO₃)₂ (s) → 2PbO (s) + 4NO₂(g) + O₂(g)
1.00 grams
2.00 grams
2.88 grams
32.0 grams
When two substances react to form products, the reactant which is used up is called the ____.
determining reactant
limiting reactant
excess reactant
catalytic reactant
What is the maximum number of grams of PH₃ that can be formed when 6.2 g of phosphorus reacts with 4.0 g of hydrogen to form PH₃? P₄(g) + 6H₂(g) → 4PH₃(g)
0.43 grams
270 grams
6.8 grams
27 grams
In a particular reaction between copper metal and silver nitrate, 12.7 g Cu produced an actual yield of 38.1 g Ag. What is the percent yield of silver in this reaction? Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag
56.7%
77.3%
88.2%
176%
