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WorksheetsRegents Chemistry Prep: Most Common MC Questions
Total questions: 96
Worksheet time: 50mins
Which substance can be broken down by a chemical change?
antimony
carbon
hexane
sulfur
Which substance cannot be broken down by a chemical reaction?
ammonia
argon
methane
water
Which substance can be decomposed by a chemical change?
Co
CO
Cr
Cu
Which substance cannot be broken down by a chemical change?
ammonia
mercury
propane
water
Which substance can be broken down by chemical means?
magnesium
manganese
mercury
methanol
Which statement describes the type of change and the chemical properties of the product and the reactants?
The equation represents a physical change, with the product and reactants having different chemical properties
The equation represents a physical change, with the product and reactants having identical chemical properties
The equation represents a chemical change, with the product and reactants having different chemical properties
The equation represents a chemical change, with the product and reactants having identical chemical properties
Which balanced equation represents a chemical change?
A
B
C
D
Which statement describes a chemical property of silicon?
Silicon has a blue-gray color
Silicon melts at 1414oC
Silicon is a brittle solid at 20oC
Silicon reacts with fluorine
Which statement describes a chemical property of aluminum?
Aluminum is malleable
Aluminum reacts with sulfuric acid
Aluminum conducts an electric current
Aluminum has a density of 2.698 g/cm3 at STP
Which statement describes a chemical property of bromine?
Bromine is soluble in water
Bromine has a reddish-brown color
Bromine combines with aluminum to produce AlBr3
Bromine changes from a liquid to a gas at 332 K and 1 atm.
Which statement describes a chemical property of the element magnesium?
Magnesium is malleable
Magnesium reacts with acid
Magnesium conducts electricity
Magnesium has a high boiling point
Which phrase describes an Al atom?
a negatively charged nucleus, surrounded by negatively charged electrons
a negatively charged nucleus, surrounded by positively charged electrons
a positively charged nucleus, surrounded by negatively charged electrons
a positively charged nucleus, surrounded by positively charged electrons
Which statement describes the location of protons and neutrons in an atom of helium?
Protons and neutrons are in the nucleus
Protons and neutrons are outside the nucleus
Protons are outside the nucleus, and neutrons are in the nucleus
Protons are in the nucleus, and neutrons are outside the nucleus.
Which statement describes the location of two types of subatomic particles in a helium atom?
Protons and neutrons are located in the nucleus
Protons and neutrons are located outside of the nucleus
Protons and electrons are located in the nucleus
Protons and electrons are located outside the nucleus
According the the modern model of the atom, the nucleus of an atom is surrounded by one or more
protons
neutrons
positrons
electrons
In the wave mechanical model, a region of the most probable electron location is called the
orbit
orbital
nucleus
excited state
Which part of a helium atom is positively charged?
electron
neutron
nucleus
orbital
Which two particles each have a mass approximately equal to one atomic mass unit?
electron and neutron
electron and positron
proton and electron
proton and neutrons
The mass of a proton is approximately equal to the mass of
an electron
a neutron
an alpha particle
a beta particle
Which particle has the least mass?
a proton
a helium atom
an electron
a hydrogen atom
Which statement describes the charge of an electron and the charge of a proton
An electron and a proton both have a charge of +1
An electron and a proton both have a charge of -1
An electron has a charge of +1, and a proton has a charge of -1
An electron has a charge of -1, and a proton has a charge of +1
What is the number of electrons in a potassium atom?
18
19
20
39
Which particle has no charge
electron
neutron
positron
proton
Which two subatomic particles have approximately the same mass?
proton and electron
proton and neutron
proton and positron
proton and beta particle
Which numerical setup can be used to calculate the atomic mass of the element bromine?
A
B
C
D
Which numerical setup can be used to calculate the atomic mass of the element chlorine?
a
b
c
d
Element X has two isotopes. If 72.0% of the element has an isotopic mass of 84.9 atomic mass units, and 28.0% of the element has an isotopic mass of 87.0 atomic mass units, the average atomic mass of element X is numerically equal to
A
B
C
D
Which numerical set up can be used to determine the atomic mass of naturally occurring lithium?
A
B
C
D
Two forms of solid carbon, diamond and graphite, differ in their physical properties due to the differences in their
atomic numbers
isotopic abundances
crystal structures
percent compositions
At STP, both diamond and graphite are solids composed of carbon atoms. These solids have
the same crystal structure and the same properties
the same crystal structure and different properties
different crystal structures and the same properties
different crystal structures and different properties
The two forms of oxygen, O2(g) and O3(g), have
different molecular structures and identical properties
different molecular structures and different properties
identical molecular structures and identical properties
identical molecular structures and different properties
Which statement describes oxygen gas, O2(g), and ozone gas, O3(g)?
They have different molecular structures, only
They have different properties, only
They have different molecular structures and different properties.
They have the same molecular structure and the same properties.
Which statement explains why ozone gas, O3, and oxygen gas, O2, have different properties?
They are formed from different elements
They have different molecular structures
They have different oxidations numbers
They have different electronegativities
Which electron configuration represents the electrons of an atom in an excited state?
2-2
2-2-1
2-8
2-8-1
Which electron configuration represents the electrons in an atom of calcium in an excited state?
2-8-8
2-8-8-2
2-7-8-1
2-7-8-3
Which electron configuration represents an atom of chlorine in an excited state?
2-7-7
2-7-8
2-8-7
2-8-8
Which electron configuration represents the electrons in an atom of Ga in an excited state?
2-8-17-3
2-8-17-4
2-8-18-3
2-8-18-4
Which electron configuration represents a selenium atom in an excited state?
2-7-18-6
2-7-18-7
2-8-18-6
2-8-18-7
Which elements have the most similar chemical properties?
K and Na
K and Cl
K and Ca
K and S
Atoms of elements in a group on the periodic table have similar chemical properties. This similarity is most closely related to the atoms'
number of principal energy levels (shells)
number of valence electrons
atomic numbers
atomic masses
Which three elements have the most similar chemical properties
Ar, Kr, Br
K, Rb, Cs
B, C, N
O, N, Si
Lithium and potassium have similar chemical properties because the atoms of both elements have the same
mass number
atomic number
number of electron shells
number of valence electrons
Which two elements have the most similar chemical properties?
beryllium and magnesium
hydrogen and helium
phosphorus and sulfur
potassium and strontium
Which term represents the strength of the attraction an atom has for the electrons in a chemical bond?
electrical conductivity
electronegativity
first ionization energy
specific heat capacity
An atom of which element has the strongest attraction for the electrons in a bond?
aluminum
carbon
chlorine
lithium
Which atom has the greatest attraction for the electrons in a chemical bond?
hydrogen
oxygen
silicon
sulfur
Which element has atoms with the strongest attraction for electrons in a chemical bond?
chlorine
nitrogen
fluorine
oxygen
Which atom has the weakest attraction for electrons in a chemical bond?
a boron atom
a calcium atom
a fluorine atom
a nitrogen atom
Which term represents the attraction one atom has for the electrons in a bond with another atom?
electronegativity
electrical conductivity
first ionization energy
mechanical energy
Given the equation representing a reaction:
H + H → H2
Which statement describes the energy change in this reaction?
A bond is broken as energy is absorbed
A bond is broken as energy is released
A bond is formed as energy is absorbed
A bond is formed as energy is released
Given the equation representing a reaction:
O + O → O2
Which statement describes the changes that occur as the oxygen molecule is produced?
Energy is absorbed as bonds are broken
Energy is absorbed as bonds are formed
Energy is released as bonds are broken
Energy is released as bonds are formed
Given the equation representing a reaction:
H2(g) + I2(g) → 2HI(g)
Which statement describes the energy changes that occur in this reaction?
Energy is absorbed as bonds are formed, only.
Energy is released as bonds are broken, only.
Energy is absorbed as bonds are formed, and energy is released as bonds are broken
Energy is absorbed as bonds are broken, and energy is released as bonds are formed
Given the balanced equation representing a reaction:
H2 → H + H
What occurs as bonds are broken in one mole of H2 molecules during this reaction?
Energy is absorbed as bonds are broken
Energy is absorbed as bonds are formed
Energy is released as bonds are broken
Energy is released as bonds are formed
Given the balanced equation representing a reaction:
2H2O + energy → 2H2 + O2
Which statement describes the changes in energy and bonding for the reactant?
Energy is absorbed as bonds in H2O are formed.
Energy is absorbed as bonds in H2O are broken.
Energy is released as bonds in H2O are formed.
Energy is released as bonds in H2O are broken.
What occurs as two atoms of fluorine combined to become a molecule of fluorine?
A bond is formed as energy is absorbed.
A bond is formed as energy is released.
A bond is broken as energy is absorbed.
A bond is broken as energy is released
Which type of molecule is CF4?
polar, with a symmetrical distribution of charge
polar, with an asymmetrical distribution of chargw
nonpolar, with a symmetrical distribution of charge
nonpolar, with an asymmetrical distribution of charge.
Which phrase describes a molecule of CH4, in terms of molecular polarity and distribution of charge?
polar with an aysmmetrical distribution of charge
polar with a symmetrical distribution of charge
nonpolar with an aymmetrical distribution of charge
nonpolar with a symmetrical distribution of charge
Which statement explains why the molecule is nonpolar?
Electrons are shared between the carbon atoms and the hydrogen atoms.
Electrons are transferred from the carbon atoms to the hydrogen atoms.
The distribution of charge in the molecule is symmetrical
The distribution of charge in the molecule is asymmetrical
Which statement describes the molecular polarity and charge distribution of a molecule of water?
polar and symmetrical
polar and asymmetrical
nonpolar and symmetrical
nonpolar and asymmetrical
The molecule shown is
symmetrical and polar
symmetrical and nonpolar
asymmetrical and polar
asymmetrical and nonpolar
The total number of pairs of shared electrons in a nitrogen molecule is
1
2
3
4
What is the total number of electrons shared in a double covalent bond?
1
2
3
4
What is the total number of electron pairs shared between the two atoms in an O2 molecule?
1
2
6
4
How many total electrons are shared between the two nitrogen atoms in N2?
2
3
4
6
What is the total number of electrons shared between the carbon atoms in the ethyne molecule shown/
6
2
3
4
What is the chemical formula for ammonium sulfide?
(NH4)2S
(NH4)2SO3
(NH4)2SO4
(NH4)2S2O3
What is the chemical formula for sodium sulfate?
Na2SO4
Na2SO3
NaSO4
NaSO3
What is the chemical formula for lead (IV) oxide?
PbO2
PbO4
Pb4O
Pb2O
Which formula represents strontium phosphate?
SrPO4
Sr3PO8
Sr2(PO4)3
Sr3(PO4)2
The chemical formula for nickel (II) bromide is
Ni2Br
NiBr2
N2Br
NBr2
What is the empirical formula of the compound whose molecular formula is P4O10
PO
PO2
P2O5
P8O20
Which compound represents both a molecular and empirical formula?
C2H4
C3H6
CH4
H2O2
What is the empirical formula of a compound with the molecular formula C6H12O6?
C4H8O8
C3H6O3
C2H4O2
CH2O
What is the empirical formula of this compound?
CH3O
C2H5O
C4H10O2
C8H20O4
The behavior of real gases most closely resembles that of an ideal gas under conditions of
high temperature and low pressure
high temperature and high pressure
low temperature and low pressure
low temperature and high pressure
A real gas behaves LEAST like an ideal gas under the conditions of
low temperature and low pressure
low temperature and high pressure
high temperature and low pressure
high temperature and high pressure
Under which conditions of temperature and pressure would a 1-liter sample of a real gas behave most like an ideal gas
100 K and 0.1 atm
100 K and 10 atm
500 K and 0.1 atm
500 K and 10 atm
Under which conditions of temperature and pressure would a real gas behave most like an ideal gas
200 K and 50.0 kPa
200 K and 200.0 kPa
600 K and 50.0 kPa
600 K and 200.0 kPa
Under which conditions of temperature and pressure does carbon dioxide gas behave most like an ideal gas
low temperature and low pressure
low temperature and high pressure
high temperature and low pressure
high temperature and high pressure
At STP, which gaseous sample has the same number of molecules as 3.0 liters of N2(g)?
6.0 L of F2(g)
4.5 L of N2(g)
3.0 L of H2(g)
1.5 L of Cl2(g)
At STP, which sample contains the same number of molecules as 3.0 liters of H2(g)?
1.5 L of NH3(g)
3.0 L of CH4(g)
2.0 L of CO2(g)
6.0 L of N2(g)
Which rigid cylinder contains the same number of gas molecules at STP as a 2.0-liter rigid cylinder containing H2(g) at STP?
1.0-L cylinder of O2(g)
1.5-L cylinder of NH3(g)
2.0-L cylinder of CH4(g)
4.0-L cylinder of He(g)
Which two gas samples have the same total number of molecules?
A and B
A and C
B and C
B and D
A sample of oxygen gas is sealed in container X. A sample of hydrogen gas is sealed in container Z. Both samples have the same volume, temperature, and pressure. Which statement is true?
Container X contains more gas molecules than container Z.
Container X contains fewer gas molecules than container Z.
Containers X and Z both contain the same number of gas molecules.
Containers X and Z both contain the same mass of gas.
Which sample of matter has particles arranged in a crystalline structure?
Ne(g)
Br2(l)
NaCl(aq)
CuSO4(s)
Particles are arranged in a crystal structure in a sample of
H2(g)
Br2(l)
Ar(g)
Ag(s)
Which sample of matter has a crystal structure?
Hg(l)
H2O(l)
NaCl(s)
CH4(g)
In which 1.0-gram sample are the particles arranged in a crystal structure?
CaCl2(s)
C2H6(g)
CH3OH(l)
CaI2(aq)
The particles in a cyrstalline solid are arranged
randomly and far apart
regularly and far apart
randomly and close together
regularly and close together
Which of the following substances is made up of particles with the highest average kinetic energy?
NO(g) at 25oC
N2O(g) at 15oC
NO2(g) at 30oC
N2O3(g) at 20oC
As a substance undergoes a change from the solid to the liquid phase, at constant temperature, the average kinetic energy of its molecules
decreases
increases
remains the same
Which is a measure of the average kinetic energy of particles of a substance?
pressure
mass
density
temperature
The molecules of which substance have the highest average kinetic energy?
He(g) at 0oC
CO2(g) at 20oC
HCl(g) at 40oC
N2(g) at 60oC
The average kinetic energy of water molecules increases when
H2O(s) changes to H2O(l) at 0ºC
H2O(l) changes to H2O(s) at 0ºC
H2O(l) at 10ºC changes to H2O(l) at 20ºC
H2O(l) at 20ºC changes to H2O(l) at 10ºC
Based on Reference Table F, which of the following compounds is least soluble in water?
NaCl
Pb2ClO3
Na2CrO4
PbCrO4
According to Reference Table F, which compound is most soluble in water?
BaCO3
BaSO4
ZnCO3
ZnSO4
