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Chemistry
Q:
By analogy with the oxoanions of sulfur, H2TeO3 would be named
A) hydrotellurous acid.
B) pertelluric acid.
C) telluric acid.
D) tellurous acid.
Q:
The compound, Cu(ClO3)2, is named
A) copper chlorate(II).
B) copper(I) chlorate.
C) copper(I) chlorate(II).
D) copper(II) chlorate.
Q:
The chemical formula for potassium peroxide is
A) KOH.
B) KO2.
C) K2O.
D) K2O2.
Q:
The chemical formula for the sulfite ion is
A) S-.
B) S2-.
C) SO32-.
D) SO42-.
Q:
The formula for dinitrogen trioxide is
A) N(OH)3.
B) (NO3)2.
C) N2O3.
D) N3O2.
Q:
What is the chemical formula for strontium hydride?
A) SrH2
B) SrOH
C) SrOH2
D) Sr(OH)2
Q:
What is the chemical formula for strontium hydroxide?
A) SrH2
B) SrOH
C) SrOH2
D) Sr(OH)2
Q:
Li2S is named
A) lithium disulfide.
B) lithium sulfide.
C) lithium(II) sulfide.
D) lithium sulfur.
Q:
What is the charge on the Cr in the ionic compound Cr2O3?
A) 2-
B) 1+
C) 2+
D) 3+
Q:
What is the chemical formula for iron(II) phosphate?
A) Fe2P
B) Fe2PO4
C) Fe3P2
D) Fe3(PO4)2
Q:
The definitive distinction between ionic bonding and covalent bonding is that
A) ionic bonding involves a sharing of electrons and covalent bonding involves a transfer of electrons.
B) ionic bonding involves a transfer of electrons and covalent bonding involves a sharing of electrons.
C) ionic bonding requires two nonmetals and covalent bonding requires a metal and a nonmetal.
D) covalent bonding requires two nonmetals and ionic bonding requires a metal and a nonmetal.
Q:
The gas Freon-11, CCl3F, contains
A) C4+, Cl-, and F- ions.
B) C4+, Cl3-, and F- ions.
C) C4+ and Cl3F4- ions.
D) CCl3F molecules.
Q:
Which of the following statements concerning ionic compounds is true?
A) Essentially all ionic compounds are solids at room temperature and pressure.
B) Ionic compounds do not contain any covalent bonds.
C) Ionic compounds contain the same number of positive ions as negative ions.
D) The chemical formula for an ionic compound must show a nonzero net charge.
Q:
The solid compound, Na2CO3, contains
A) Na+, C4+, and O2- ions.
B) Na+ ions and CO32-ions.
C) Na2+ and CO32- ions.
D) Na2CO3 molecules.
Q:
Butyric acid has the structural formula given below. What is the molecular or chemical formula for butyric acid?
A) CHO
B) C2H4O
C) C4H8O2
D) C5H8O3
Q:
Which of the following elements has the least tendency to form an ion?
A) Ca
B) K
C) Kr
D) Se
Q:
Which of the species below has 28 protons and 26 electrons?
A) Fe2+
B) Ni2+
C) D)
Q:
Which of the compounds, C3H8, MgCl2, Zn(NO3)2, OCl2, are expected to exist as molecules?
A) only C3H8
B) C3H8 and OCl2
C) C3H8, Zn(NO3)2, and OCl2
D) MgCl2 and Zn(NO3)2
Q:
Which of the compounds, Li3P, PH3, C2H6, IBr3, are ionic compounds?
A) only C2H6
B) only Li3P
C) Li3P and PH3
D) PH3, C2H6, and IBr3
Q:
Which of the following is the correct chemical formula for a molecule of bromine?
A) Br
B) Br-
C) Br+
D) Br2
Q:
Which one of the following compounds contains ionic bonds?
A) CaO
B) HF
C) NI3
D) SiO2
Q:
What type of bonding is found in the compound PCl5?
A) covalent bonding
B) hydrogen bonding
C) ionic bonding
D) metallic bonding
Q:
Which element can form more than one kind of monatomic ion?
A) S
B) Se
C) Sn
D) Sr
Q:
Which element can form more than one kind of monatomic ion?
A) Ca
B) Cl
C) Cr
D) Cs
Q:
What is the most likely charge on an ion of phosphorus, P?
A) 5-
B) 3-
C) 3+
D) 5+
Q:
In which set do all elements tend to form anions in binary ionic compounds?
A) C, S, Pb
B) K, Fe, Br
C) Li, Na, K
D) N, O, I
Q:
In which set do all elements tend to form cations in binary ionic compounds?
A) Li, B, O
B) Mg, Cr, Pb
C) N, As, Bi
D) O, F, Cl
Q:
How many electrons are in the ion, CO32-?
A) 16
B) 28
C) 30
D) 32
Q:
What is the identity of element Q if the ion Q2+ contains 10 electrons?
A) C
B) O
C) Ne
D) Mg
Q:
In which of the following sets do all species have the same number of protons?
A) Br-, Kr, Sr2+
B) C, N3-, O2-
C) Mg2+, Sr2+, Ba2+
D) O, O2-, O2+
Q:
In which of the following sets do all species have the same number of electrons?
A) Br-, Kr, Sr2+
B) C, N3-, O2-
C) Mg2+, Sr2+, Ba2+
D) O, O2-, O2+
Q:
How many electrons are in the ion, P3-?
A) 12
B) 18
C) 28
D) 34
Q:
How many electrons are in the ion, Zn2+?
A) 28
B) 30
C) 32
D) 65
Q:
Steel is galvanized by giving it a surface coating of zinc. Galvanized steel is an example of
A) a compound.
B) an element.
C) a heterogeneous mixture.
D) a homogeneous mixture.
Q:
Carbon dioxide is an example of
A) a compound.
B) an element.
C) a heterogeneous mixture.
D) a homogeneous mixture.
Q:
Gold is an example of
A) a compound.
B) an element.
C) a heterogeneous mixture.
D) a homogeneous mixture.
Q:
Apple juice is an example of
A) a compound.
B) an element.
C) a heterogeneous mixture.
D) a homogeneous mixture.
Q:
A banana split is an example of
A) a compound.
B) an element.
C) a heterogeneous mixture.
D) a homogeneous mixture.
Q:
When decays in a 5-step series the product is . How many alpha and beta particles are emitted in the decay series?
Q:
What nuclide is formed when undergoes a portion of the decay series: alpha, beta, beta, alpha, alpha, alpha.
A) B) C) D)
Q:
Which of the following nuclides is most likely to decay by electron capture?
A) B) C) D)
Q:
Which of the following nuclides is most likely to undergo beta decay?
A) B) C) D)
Q:
A radioisotope which is neutron poor and very heavy is most likely to decay by
A) alpha emission, electron capture, or positron emission.
B) only alpha emission.
C) only electron capture.
D) only positron emission.
Q:
A radioisotope has a neutron/proton ratio which is too low. Which of the following processes will not occur for such a nucleus?
A) alpha emission
B) beta emission
C) electron capture
D) positron emission
Q:
Which process decreases the neutron/proton ratio?
A) alpha emission
B) beta emission
C) electron capture
D) positron emission
Q:
Which of the following elements would be expected to be particularly stable?
A) B) C) D)
Q:
Which of the following elements would you expect to have the largest number of stable isotopes? Element number:
A) 48
B) 49
C) 50
D) 51
Q:
Which one of the following combinations of neutrons/protons results in the lowest number of nonradioactive (stable) isotopes?
A) even number protons/even number neutrons
B) even number protons/odd number neutrons
C) odd number protons/even number neutrons
D) odd number protons/odd number neutrons
Q:
Which one of the following statements about isotopes is false?
A) The ratio of neutrons to protons is about 1:1 for elements lighter than Ca.
B) The ratio of neutrons to protons is > 1:1 for elements heavier than Ca.
C) Nonradioactive isotopes generally have an odd number of neutrons.
D) All isotopes beyond 209Bi are radioactive.
Q:
As the atomic number of the elements increases, the ratio of neutrons to protons in stable nuclei
A) decreases.
B) stays the same.
C) increases.
D) is unrelated to stability.
Q:
Which is the only element that contains more protons than neutrons in its most abundant stable isotope?
A) boron
B) carbon
C) hydrogen
D) mercury
Q:
When more than 3000 known nuclides are plotted on a neutron/proton grid they make up a group called
A) the "island of stability."
B) the "peninsula of nuclear stability."
C) the "sea of instability."
D) none of these
Q:
Tritium, , is formed in the upper atmosphere when captures a neutron and then decays. What is the other product of this reaction?
A) B) C) D)
Q:
In addition to a beta particle, what is the other product of beta decay of ?
A) B) C) D)
Q:
Which reaction below represents decay by electron capture?
Q:
Which reaction below represents decay by alpha emission?
Q:
Which reaction below represents decay by positron emission?
Q:
Which of the following decay processes give a product nuclide whose atomic number is one less than the starting nuclide?
A) alpha decay
B) beta decay and positron decay
C) gamma decay and beta decay
D) positron decay and electron capture
Q:
Which one of the following processes does not result in transmutation to another element?
A) alpha emission
B) beta emission
C) electron capture
D) gamma emission
Q:
Which of the following statements about electron capture is false?
A) The electron is used to convert a proton to a neutron.
B) The electron involved is most likely an outer shell valence electron.
C) In electron capture decay, the atomic number decreases by one.
D) In electron capture decay, the mass number remains unchanged.
Q:
The nuclear transformation potassium-40 argon-40 + ? is classified as
A) alpha emission.
B) beta emission.
C) electron capture.
D) positron emission.
Q:
Which of the following statements about positrons is false?
A) The positron has same mass as an electron.
B) A positron is ejected from the nucleus during the conversion of a proton into a neutron.
C) A positron is a positive electron.
D) When positron emission occurs, the atomic number of the nucleus increases.
Q:
Positron emission changes the atomic number of an element by
A) -2.
B) -1.
C) +1.
D) +2.
Q:
A positron is
A) .
B) .
C) .
D) .
Q:
Gamma radiation can be described as
A) a helium nucleus.
B) a negatively charged free electron.
C) high energy electromagnetic radiation.
D) a positively charged free electron.
Q:
Which of the following statements about gamma radiation is false?
A) It almost always accompanies alpha or beta emission.
B) It is a mechanism to release excess energy in the nucleus.
C) Gamma rays are high energy photons.
D) The mass number decreases by one with each gamma emitted.
Q:
Beta decay of 24Na produces a beta particle and
A) 20F.
B) 23Na.
C) 24Ne.
D) 24Mg.
Q:
When a substance decays by beta emission, the mass number of the nucleus ________ and the atomic number ________.
A) decreases by 1, remains the same
B) increases by 1, remains the same
C) remains the same, decreases by 1
D) remains the same, increases by 1
Q:
A beta particle is
A) .
B) .
C) .
D) .
Q:
The nuclear decay process that involves the particle having the greatest mass is ________ emission.
A) alpha
B) beta
C) gamma
D) positron
Q:
When a substance decays by alpha radiation, the mass number of the nucleus ________ and the atomic number ________.
A) increases by 4, increases by 2
B) reduces by 4, reduces by 2
C) increases by 2, increases by 4
D) reduces by 2, reduces by 4
Q:
An alpha particle is
A) .
B) .
C) .
D) .
Q:
Which of the following statements is not correct when balancing a nuclear equation?
I. The mass numbers must be conserved on both sides of the reaction arrow.
II. The ionic charges must be conserved on both sides of the reaction arrow.
III. The atomic numbers must be conserved on both sides of the reaction arrow.
IV. The elements must be the same on both sides of the reaction arrow.
A) II only
B) II and III
C) I and III
D) II and IV
Q:
The rate of a nuclear reaction can be changed by
A) adding a catalyst.
B) decreasing the pressure.
C) increasing the temperature.
D) None of these
Q:
"Isotopes" are atoms with the same number of ________ but different number of ________.
A) electrons, protons
B) neutrons, protons
C) protons, electrons
D) protons, neutrons
Q:
The number of neutrons in is
A) 26.
B) 29.
C) 53.
D) 55.
Q:
The number of nucleons in a nucleus is
A) 92.
B) 144.
C) 236.
D) 328.
Q:
The number of nucleons in an atom or ion is the same as the
A) atomic number.
B) charge on the atom or ion.
C) mass number.
D) none of these
Q:
The term "nucleons" refers to the number of ________ in the atom.
A) neutrons
B) protons
C) protons and neutrons
D) protons, neutrons, and electrons
Q:
Which statement about nuclear reactions is true?
A) New elements are never produced in a nuclear reaction.
B) Nuclear reactions involve valence electrons.
C) The rate of a nuclear reaction is affected by catalysts.
D) Tremendous amounts of energy are involved in nuclear reactions.