21-25
25-30
31-35
36-40
41-45
46-50
100
According to which theory or law is a chemical reaction most likely to occur when two particles with the proper energy and orientation interact with each other?
(1) atomic theory
(2) collision theory
(3) combined gas law
(4) law of conservation of matter
(2) collision theory
100
Which substance is an Arrhenius acid?
(1) H2
(2) HCl
(3) KCl
(4) NH3
(2) HCl
100
The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the same number of protons per atom and
(1) the same number of electrons per atom
(2) the same number of neutrons per atom
(3) a different number of electrons per atom
(4) a different number of neutrons per atom
(4) a different number of neutrons per atom
100
What is the number of moles of CO2 in a 220.-gram sample of CO2 (gram-formula mass 44 g/mol)?
(1) 0.20 mol
(2) 5.0 mol
(3) 15 mol
(4) 44 mol
(2) 5.0 mol
100
Which numerical setup can be used to calculate
the heat energy required to completely melt
100. grams of H2O(s) at 0°C?
(1) (100. g)(334 J/g)
(2) (100. g)(2260 J/g)
(3) (100. g)(4.18 J/g•K)(0°C)
(4) (100. g)(4.18 J/g•K)(273 K)
(1) (100. g)(334 J/g)
100
Zn(s) + Co2+(aq) → Zn2+(aq) + Co(s)
Which statement describes the electrons involved in this reaction?
(1) Each Zn atom loses 2 electrons, and each
Co2+ ion gains 2 electrons.
(2) Each Zn atom loses 2 electrons, and each
Co2+ ion loses 2 electrons.
(3) Each Zn atom gains 2 electrons, and each Co2+ ion loses 2 electrons.
(4) Each Zn atom gains 2 electrons, and each
Co2+ ion gains 2 electrons.
(1) Each Zn atom loses 2 electrons, and each Co2+ ion gains 2 electrons.
200
Addition of a catalyst can speed up a reaction by providing an alternate reaction pathway that has a
(1) lower activation energy
(2) higher activation energy
(3) lower heat of reaction
(4) higher heat of reaction
(1) lower activation energy
200
Which statement describes an electrolyte?
(1) An electrolyte conducts an electric current as a solid and dissolves in water.
(2) An electrolyte conducts an electric current as a solid and does not dissolve in water.
(3) When an electrolyte dissolves in water, the resulting solution conducts an electric current.
(4) When an electrolyte dissolves in water, the
resulting solution does not conduct an
electric current.
(3) When an electrolyte dissolves in water, the resulting solution conducts an electric current.
200
Diamond and graphite have different properties because they have different
(1) crystal structures
(2) electronegativities
(3) numbers of protons per atom
(4) numbers of valence electrons per atom
(1) crystal structures
200
A solution contains 25 grams of KNO3 dissolved in 200. grams of H2O. Which numerical setup can be used to calculate the percent by mass of KNO3 in this solution?
200
During which phase change does the entropy of a sample of H2O increase?
(1) H2O(g) → H2O(ℓ)
(2) H2O(g) → H2O(s)
(3) H2O(ℓ) → H2O(g)
(4) H2O(ℓ) → H2O(s)
(3) H2O(ℓ) → H2O(g)
200
What are the two oxidation states of nitrogen in NH4NO2?
(1) +3 and +5
(2) +3 and -5
(3) -3 and +3
(4) -3 and -3
(3) -3 and +3
300
Which compound is saturated?
(1) butane
(2) ethene
(3) heptene
(4) pentyne
(1) butane
300
Which type of reaction occurs when an Arrhenius acid reacts with an Arrhenius base to form a salt and water?
(1) combustion
(2) decomposition
(3) neutralization
(4) saponification
(3) neutralization
300
NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s)
This reaction is classified as a
(1) synthesis reaction
(2) decomposition reaction
(3) single replacement reaction
(4) double replacement reaction
(4) double replacement reaction
300
What is the molarity of 0.50 liter of an aqueous solution that contains 0.20 mole of NaOH (gram-formula mass = 40. g/mol)?
(1) 0.10 M
(2) 0.20 M
(3) 2.5 M
(4) 0.40 M
(4) 0.40 M
300
What is a chemical name for this compound?
(1) 1-butanamide
(2) 4-butanamide
(3) 1-butanamine
(4) 4-butanamine
300
Which solution has the highest pH?
(1) A
(2) B
(3) C
(4) D
(4) D
400
An alcohol and an ether have the same molecular formula, C2H6O. These two compounds have
(1) the same functional group and the same physical and chemical properties
(2) the same functional group and different physical and chemical properties
(3) different functional groups and the same physical and chemical properties
(4) different functional groups and different
physical and chemical properties
(4) different functional groups and different physical and chemical properties
400
Compared to the energy released per mole of reactant during chemical reactions, the energy released per mole of reactant during nuclear reactions is
(1) much less
(2) much greater
(3) slightly less
(4) slightly greater
(2) much greater
400
What is the formula for iron(II) oxide?
(1) FeO
(2) FeO2
(3) Fe2O
(4) Fe2O3
(1) FeO
400
A mixture consists of ethanol and water. Some
properties of ethanol and water are given in the
table below.
Which statement describes a property of ethanol after being separated from the mixture?
(1) Ethanol is nonflammable.
(2) Ethanol has a melting point of 0.°C.
(3) Ethanol has a density of 0.80 g/cm3 at STP.
(4) Ethanol has a boiling point of 89°C at
standard pressure.
(3) Ethanol has a density of 0.80 g/cm3 at STP.
400
C4H10 Cl2 → C4H9Cl HCl
Which type of reaction is represented by the equation?
(1) addition
(2) substitution
(3) fermentation
(4) polymerization
(2) substitution
400
Which type of nuclear reaction is represented by the equation?
(1) fission
(2) fusion
(3) beta decay
(4) alpha decay
(1) fission
500
Which metal is most easily oxidized?
(1) Ag
(2) Co
(3) Cu
(4) Mg
(4) Mg
500
Which phrase describes a risk of using the radioisotope Co-60 in treating cancer?
(1) production of acid rain
(2) production of greenhouse gases
(3) increased biological exposure
(4) increased ozone depletion
(3) increased biological exposure
500
2KClO3(s) → 2KCl(s) + 3O2(g)
How many moles of KClO3 must completely react to produce 6 moles of O2?
(1) 1 mole
(2) 2 moles
(3) 6 moles
(4) 4 moles
(4) 4 moles
500
A rigid cylinder with a movable piston contains a sample of hydrogen gas. At 330. K, this sample has a pressure of 150. kPa and a volume of 3.50 L. What is the volume of this sample at STP?
(1) 0.233 L
(2) 1.96 L
(3) 4.29 L
(4) 6.26 L
(3) 4.29 L
500
Which half-reaction equation represents
reduction?
(1) Cu → Cu2+ + 2e-
(2) Cu2+ + 2e-? → Cu
(3) Ag + e-? → Ag+
(4) Ag+ → Ag + e-?
(2) Cu2+ + 2e-? → Cu
500
Which nuclear emission has the least penetrating power and the greatest ionizing ability?
(1) alpha particle
(2) beta particle
(3) gamma ray
(4) positron
(1) alpha particle