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Unit 2 Practice Questions I. Atomic Theory Questions 1-4 refer to the following: (A) (B) (C) (D) (E) Proton Neutron Electron Isotope Ion 1. 2. 3. 4. Neutral charge; 1 amu Positive charge Negligible weight Negative charge; pairs with opposite spin 1 Questions 1-4 refer to the following: (A) (B) (C) (D) (E) Atom Ion Neutron Proton electron 1. The smallest representative particle of helium 2. Loss or gain creates positively or negatively charged ion, respectively 3. Particle responsible for positive nuclear charge 4. Isotopes of uranium always differ in their number of this particle 5. Their number in the nucleus determines an element’s atomic number 2 II I The periodic table does not report mass numbers Addition of an electron to an atom creates a positively charged ion BECAUSE A mass number can be assigned to one isotope of an element but not to an element in general BECAUSE Every electron carries a negative charge 3 II I Ca is a neutral atom An element (X) with an atomic number of 16 has 14 electrons in X-2 BECAUSE It has the same number of protons and electrons BECAUSE Two protons bind the two outermost electrons 4 II I Two isotopes of the same element have the same mass number An atom of 12C contains 12 protons BECAUSE Isotopes have the same number of protons BECAUSE The identity of an element is determined by the number of protons in the nuclei of its atoms 5 II I The atomic number of a neutral atom that has a mass of 39 and has 19 electrons is 19 A large number of alpha particles were deflected in the Rutherford experiment BECAUSE The number of protons in a a neutral atom is equal to the number of electrons BECAUSE Alpha particles that came close to the nucleus of the gold atoms were deflected 6 II I The isotope Cl-37 has 17 protons, 17 neutrons, and 17 electrons BECAUSE The atomic mass of chlorine is 35.43 amu 7 Which of the following is not a conclusion Rutherford made from his experiment with alpha particles being shot at a thin sheet of gold foil? (A) (B) (C) (D) (E) An atom has a very small, compact nucleus An atom is mainly empty space An atom’s mass is concentrated in the nucleus An atom has a very dense nucleus An atom has a negatively charged nucleus 8 Which of the following statements is false regarding sub-atomic particles? (A) The proton has a positive one charge (B) The neutron has no charge (C) The electrons are found in regions of the atom called orbitals (D) The electrons have a greater mass than the protons (E) Protons and neutrons are the nucleons of the atom 9 The two main regions of an atom are the (A) (B) (C) (D) Principal energy levels and energy sublevels Nucleus and kernel Nucleus and energy levels Planetary electrons and energy levels 10 An atom of beryllium consists of 4 protons, 5 neutrons and 4 electrons. The mass number of this atom is (A) (B) (C) (D) 13 9 8 5 11 A mysterious element has the following relative abundances: X-34 15%, X-35 20%, X-36 65% Which of the following is true? (A) The atomic mass of the element is closer to 34.1 (B) The atomic mass of the element is closer to 34.9 (C) The atomic mass of this element cannot be determined without knowing exactly what X is (D) A mass spectrophotometer would not be helpful in determining the percentages of the isotopes (E) The atomic mass of this element is approximately 35.5 12 Atoms of 235U and 238U differ in structure by three (A) (B) (C) (D) Electrons Isotopes Neutrons protons 13 Which of the following pairs of compounds can be used to illustrate the Law of Multiple Proportions? (A) (B) (C) (D) (E) NO and NO2 CH4 and CO2 ZnO2 and ZnCl2 NH3 and NH4Cl H2O and HCl 14 Two different sodium atoms or ions may differ in all of the following ways EXCEPT (A) (B) (C) (D) (E) The number of electrons outside their nuclei The overall charge they carry Their mass numbers The number of neutrons in their nuclei The number of protons in their nuclei 15 Which of the following isotopes has the greatest number of neutrons? (A) (B) (C) (D) (E) 35Cl 31P 40Ar 41Ca 14C 16 Which is inconsistent with the concept of an isotope? (A) (B) (C) (D) (E) Same atomic number Different number of neutrons Same mass number Same name of the element Same number of protons 17 Two isotopes of the same element will always differ in (A) (B) (C) (D) (E) Mass number but never in atomic number Atomic number but never in mass number Charge outside but never inside their nuclei Nuclear charge but never in overall charge The number of electrons outside their nuclei but never in the number of neutrons inside their nuclei 18 What is the number of protons and neutrons in an atom with mass number 89 and atomic number 39? (A) (B) (C) (D) (E) 50 protons and 50 neutrons 50 protons and 39 neutrons 39 protons and 89 neutrons 39 protons and 50 neutrons 39 protons and 39 neutrons 19 Twenty-five percent of element X exists as 210X and seventy-five percent of it exists as 214X. What is the atomic weight of element X in amu? (A) (B) (C) (D) (E) 85 211 212 213 214 20 Which of the following combinations represents an element with a net charge of +1 with a mass number of 75? (A) (B) (C) (D) (E) 35 neutrons, 35 protons, 34 electrons 40 neutrons, 40 protons, 39 electrons 40 neutrons, 35 protons, 34 electrons 37 neutrons, 38 protons, 39 electrons 40 neutrons, 35 protons, 35 electrons 21 Of the following statements about the number of subatomic particles in an ion of 3216S-2, which are true? I. 16 protons II. 14 neutrons III. 18 electrons (A) (B) (C) (D) (E) II only III only I and II only I and III only I, II and III 22 Isotopes of an element are related because which of the following are the same in these isotopes? I. Atomic mass II. Atomic number III. Arrangement of orbital electrons (A) (B) (C) (D) (E) I only II only I and II only II and III only I, II and III 23 For the radioactive element 99Tc, what is the correct number of protons and neutrons? (A) (B) (C) (D) (E) 43 protons and 56 neutrons 43 protons and 99 neutrons 56 protons and 43 neutrons 56 protons and 99 neutrons Cannot be determined 24 II. Nuclear Questions 1-4 refer to the following: (A) (B) (C) (D) (E) Alpha particle Beta particle Gamma radiation Neutron Positron 1. 2. 3. 4. Has a negative charge Has no mass and no charge Has the greatest positive charge Is very similar to an electron 25 Questions 1-3 refer to the following: (A) (B) (C) (D) (E) Alpha decay Beta decay Positron emission Gamma decay Electron capture 1. Often accompanies other radioactive processes 2. Causes an atom to reduce its atomic number by 2 and its mass number by 4 3. Occurs when a neutron is converted into a proton in a nucleus 26 II I is an isotope of BECAUSE The nuclei of both atoms have the same number of neutrons Alpha particles are the heaviest type of radiation decay BECAUSE Alpha emission particles consist of 2 protons and 2 neutrons 12C 14C 27 II I Nuclear fusion on the sun converts hydrogen to helium with a release of energy The “bullet” usually used to initiate the fusion of 235U is a neutron BECAUSE BECAUSE Some mass is converted to energy in a solar fusion Capture of the neutron by the 235U nucleus causes an unstable condition that leads to its disintegration 28 II I Radioactive elements can emit alpha particles, beta particles, and gamma rays BECAUSE Radioactive elements have extremely stable nuclei If a radioactive sample with a half-life of 40 years decays for 80 years, 25% of the sample will remain BECAUSE One half of 100% is 50%, and one half of 50% is 25% 29 6 Li + In the artificial transmutation 94Be + X 3 4 He, the particle represented by the letter X is a(n) 2 (A) (B) (C) (D) (E) Beta particle Positron Deuteron Proton Alpha particle 30 14 C 6 What is X? (A) 42He (B) 0+1e (C) 0-1e (D) 11H (E) 126C 14 N 7 +X This reaction is an example of (A) Alpha decay (B) Beta decay (C) Fusion (D) Gamma decay (E) Positron emission 31 226 Rn 86 218 Po 84 + 42He The radioactive decay shown above is an example of (A) Positron emission (B) Gamma ray emission (C) Alpha decay (D) Beta decay (E) Ionization 32 131 I 53 131 Xe 54 + 0-1e The radioactive decay shown above is an example of (A) Positron emission (B) Gamma ray emission (C) Alpha decay (D) Beta decay (E) Ionization 33 Which equation is an example of an artificial transmutation? (A) (B) (C) (D) (E) 238U 4He + 234Th 27Al + 4He 30P + 1 n 0 14C 14N + 0 e -1 226Ra 4He + 222Rn 99 Tc 99 Tc + g 43 43 34 Which nuclear equation below demonstrates beta decay? (A) 238U X + 234Th 3H (B) 1H + X 17O + 1H (C) 14N + X (D) 234Pa X + 234U (E) None of the above demonstrates beta decay 35 Element 10220X is formed as a result of 3 alpha and 2 beta decays. Which of the following is the parent element? (A) (B) (C) (D) 90 A 16 114 Z 24 114 Q 28 12 J + 90 L 8 12 36 Radioactive emanations can be detected by using (A) (B) (C) (D) (E) A person’s DNA A block of lead A Geiger counter An x-ray machine Graphite and heavy water 37 Sodium-24, a radioactive isotope used medically in blood studies, decays by beta decay and has a halflife of 15.0 hours. What is the product of the radioactive decay of sodium-24? (A) (B) (C) (D) (E) F-20 Ne-24 Ne-23 Na-23 Mg-24 38 After 62.0 hours, 1.0 gram remained unchanged from a sample of potassium-42 (half life is 12.4 hours). What was the mas of potassium-42 in the original sample? (A) (B) (C) (D) (E) 64 grams 32 grams 16 grams 8 grams 4 grams 39 The emission of a beta particle results in a new element with the atomic number (A) (B) (C) (D) Increased by 1 Increased by 2 Decreased by 1 Decreased by 2 40 The energy released by the detonation of an atomic bomb is NOT related to (A) (B) (C) (D) (E) Fission of the atom’s nucleus Fusion of the atom’s nucleus A chain reaction The release of many neutrons The uncontrolled speed of many neutrons 41 As a nucleus of a particular isotope disintegrates, another nuclide is formed. This change in the nucleus to form a new nuclide is called (A) (B) (C) (D) (E) Binding energy Transmutation Stability Generation Synthesis 42 Which element has no known stable isotope? (A) (B) (C) (D) (E) Carbon Silver Radon Phosphorus Lead 43 Which pair below would not be deflected or attracted by the charged plates in an electric field? (A) (B) (C) (D) (E) An alpha particle and a neutron A beta particle and a positron A quark and a deuteron A proton and gamma radiation Gamma radiation and a neutron 44 In 6.20 hours, a 50.0 gram sample of silver-112 decays to 12.5 grams. What is the half-life of silver112? (A) (B) (C) (D) (E) 1.60 hours 3.10 hours 6.20 hours 12.4 hours 18.6 hours 45 A physicist starts out with 320 grams of a radioactive element Z and after 20 minutes he has only 20 grams left. What is the half-life of element Z? (A) (B) (C) (D) (E) 2 minutes 3 minutes 4 minutes 5 minutes 10 minutes 46 Which of the following is closest in mass to a proton? (A) (B) (C) (D) Alpha particle Positron Neutron Electron 47 The daughter nucleus formed when 18F undergoes positron emission is (A) (B) (C) (D) (E) 14N 16O 18O 19F 20Ne 48 In 12.4 hours, a 100 gram sample of an element decays so that its mass is 25 grams. What is the approximate half-life of this radioactive substance? (A) (B) (C) (D) (E) 1.6 hours 3.1 hours 6.2 hours 24.8 hours 49.6 hours 49 Which of the following transmutations demonstrates beta decay? I. Bi-212 II. Pb-212 III. Ra-228 (A) (B) (C) (D) (E) Po-212 Bi-212 Ac-228 I only II only II and III only I and II only I , II, and III 50 Which of the following forms of radioactive decay have no electrical charge? I. Alpha decay II. Beta decay III. Gamma decay (A) (B) (C) (D) (E) II only III only I and II only I and III only II and III only 51 Which of the following are uses for radiation and radioactivity that are of benefit to us? I. nuclear waste II. radioisotopes III. Excess exposure (A) (B) (C) (D) (E) I only II only III only I and II only I and III only 52 A patient undergoing treatment for thyroid cancer receives a dose of radioactive iodine, which has a half-life of 8.05 days. If the original dose contained 12 mg of iodine-131, what mass of iodine-131 remains after 16.1 days? 53 III. Electrons Questions 1-4 refer to the following: (A) 1s (B) 2s (C) 3s (D) 3p (E) 3d 1. Contains up to 10 electrons 2. Contains one pair of electrons in the ground state of lithium 3. Is exactly half filled in the ground state of phosphorus 4. Contains a filled orbital in the ground state of helium 54 II I Two electrons in the 2s subshell must have opposite spins Gas-phase elements absorb or emit only specific wavelengths of visible light when excited by an electric current BECAUSE The Pauli exclusion principle states that no two electrons in the same atom can have identical quantum numbers BECAUSE The energy levels that electrons can occupy in gas-phase atoms and molecules are continuous 55 II I The 4s orbital fills before the 3d orbitals The ground state electron configuration of Cu is [Ar]4s13d10 BECAUSE Subshells fill in the order from lower to higher energy BECAUSE Completely filled and half-filled d orbitals bestow special electronic stabilization 56 II I An element that has the electron configuration 1s22s22p63s23p64s2 3d3 is a transition element BECAUSE The transition elements from scandium to zinc are filling the 3d orbitals 57 In a hydrogen atom, when an electron jumps from an excited energy state to a more stable energy state, (A) Electromagnetic radiation is emitted by the atom (B) Electromagnetic radiation is absorbed by the atom (C) The atom becomes a positively charged ion (D) The atom becomes a negatively charged ion (E) The atom undergoes nuclear decay 58 Which principal energy level has exactly four sublevels? (A) (B) (C) (D) (E) 1 2 3 4 5 59 Which metal is not correctly paired with its color when put into a flame? (A) (B) (C) (D) (E) Lithium-red Potassium-lilac Sodium-yellow Copper-orange Magnesium-white 60 All of the following statements are consistent with Bohr’s model of the atom EXCEPT (A) An electron may assume an infinite number of velocities (B) An atom is most stable when its electron configuration is that of the ground state (C) The electron shell numbers represent the principal energy levels (D) Electrons in orbitals closest to the nucleus have the lowest energy (E) They are all consistent 61 The maximum number of electrons in a shell with the principal quantum number equal to 4 is (A) (B) (C) (D) 2 10 16 32 62 If the principal quantum number of a shell is equal to 2, what types of orbitals will be present? (A) s (B) s and p (C) s, p, and d (D) s, p, d and f 63 An element with an atomic number of 26 has how many electrons in the 3d sublevel? (A) 0 (B) 2 (C) 6 (D) 8 (E) 10 64 Which of the following orbitals has the lowest energy? (A) 2p (B) 3s (C) 3d (D) 4s (E) 3p 65 How many valence electrons are in an atom with the configuration 1s22s22p63s23p2? (A) (B) (C) (D) (E) 6 5 4 3 2 66 The electron configuration 1s22s22p63s23p64s23d7 represents an atom of the element (A) (B) (C) (D) (E) Br Co Cd Ga Mg 67 The lowest principal quantum number that an electron can have is (A) (B) (C) (D) 0 1 2 3 68 The sublevel that has only one orbital is identified by the letter (A) (B) (C) (D) s p d f 69 The sublevel that can be occupied by a maximum of 10 electrons is identified by the letter (A) (B) (C) (D) s p d f 70 An orbital may never be occupied by (A) (B) (C) (D) 1 electron 2 electrons 3 electrons 0 electrons 71 A neutral species whose electron configuration is 1s22s22p63s23p64s23d104p65s24d105p6 is (A) (B) (C) (D) (E) Highly reactive A positively charged ion A noble gas A transition metal A lanthanide element 72 In going from1s22s22p63s23p64s1 to 1s22s22p63s23p54s2 , an electron would (A) (B) (C) (D) (E) Absorb energy Emit energy Relax to the ground state Bind to another atom Undergo no change in energy 73 Which of the following atoms does 1s22s22p63s23p63d2 represent? (A) (B) (C) (D) (E) An excited state Ca atom A ground state Ca atom An excited state Sc atom An excited state K atom None of the above 74 Which electron configuration shows that of an excited atom? (A) (B) (C) (D) (E) 1s22s22p63s1 1s22s22p63s23p63d1 1s22s22p4 1s22s22p63s23p64s2 1s22s22p63s23p3 75 Which of the following correctly represents an excited state of scandium? (A) (B) (C) (D) (E) 1s22s22p63s23p64s23d1 1s22s32p53s23p64s23d1 1s22s22p63s23p64s13d2 1s22s22p63s23p64s23d2 1s22s22p63s23p64s03d1 76 The electron configuration for an atom of the element Tc is (A) (B) (C) (D) (E) 1s22s22p63s23p64s23d104p55s25p6 1s22s22p63s23p64s23d104p35s24d5 1s22s22p63s23p64s23d104p3 1s22s22p63s23p63d15 1s22s22p63s23p64s23d104p65s24d5 77 IV. Periodic Table Questions 1-3 refer to the following: (A) F (B) Li (C) Fe (D) He (E) Si 1. Shows both the properties of metals and nonmetals 2. Has the greatest ionization energy 3. Has the greatest electronegativity 78 Questions 1-4 refer to the following: (A) (B) (C) (D) (E) K As Be Se Ir 1. 2. 3. 4. Metalloid Nonmetal Group 1A metal Is an alkaline earth metal 79 Questions 1-4 refer to the following: (A) (B) (C) (D) (E) Alkali metal Alkaline earth metal Transition metal Halogen Noble gas 1. 2. 3. 4. Reacts most vigorously with water Is chemically inert Has the highest first ionization energy in its period Contains elements in the solid, liquid and gas phases at STP 80 Questions 1-3 refer to the following: (A) (B) (C) (D) (E) Ionization energy Electronegativity Atomic radius Atomic number Mass number 1. Is the measure of the pull of the nucleus of an atom on the electrons of other atoms bonded to it 2. Is the energy required to remove an electron from an atom 3. Is equal to the number of protons in an atom 81 I K is considered to be a metal As you go from left to right across the periodic table the elements tend to become more metallic in character II BECAUSE When K becomes an ion its atomic radius increases BECAUSE As you go from left to right across the periodic table the elements tend to lose electrons 82 II I Elemental fluorine is more reactive than elemental neon Isotopes of a particular element have nearly identical chemical behavior BECAUSE Neon has a larger atomic weight than fluorine BECAUSE They have identical electron configurations 83 II I The element with an electron configuration of [He]2s1 has a larger atomic radius than fluorine Atomic radii increase down a group BECAUSE The element with an electron configuration of [He]2s1 has a greater nuclear charge than fluorine BECAUSE The higher the atomic number within a group, the smaller the atom 84 Which of the following substances are liquids at room temperature? I. Hg II. Br2 III. Si (A) (B) (C) (D) (E) I only II only I and II only II and III only I , II, and III 85 According to placement in the periodic table, which statements regarding the first ionization energies of certain elements should be true? I. Li has a higher value than Na II. K has a higher value than Cs III. Na has a higher value than Al (A) (B) (C) (D) (E) I only III only I and II only II and III only I , II, and III 86 The modern periodic table is arranged based upon atomic (A) (B) (C) (D) (E) Isotopes Number Density Radius Mass 87 Which of the following elements has the lowest electronegativity? (A) (B) (C) (D) (E) Cesium Strontium Calcium Barium Potassium 88 Where are the highest ionization energies found in the periodic table? (A) (B) (C) (D) (E) Upper left corner Lower left corner Upper right corner Lower right corner Middle of transition elements 89 The most active nonmetal has (A) (B) (C) (D) (E) A high electronegativity A low electronegativity A medium electronegativity Large atomic radii A deliquescent property 90 Which of the following metals is most reactive? (A) (B) (C) (D) (E) Na Mg Cu Au Cl 91 Which of the following is NOT true regarding nickel, Ni? (A) (B) (C) (D) (E) It is malleable It is ductile It is lustrous It is an insulator It forms colored compounds 92 Which of the following represents an ordering of the period 4 elements by increasing atomic size? (A) (B) (C) (D) (E) K, Kr, Ca, Br K, Ca, Br, Kr Kr, Br, Ca, K Ca, K, Br, Kr Br, Kr, Ca, K 93 An element has the following properties: shiny, brittle, poor electrical conductivity, and high melting point. This element can be best classified as a (A) (B) (C) (D) (E) Alkali metal Halogen Metalloid Transition metal Noble gas 94 The order of the elements in the periodic table is based on (A) (B) (C) (D) (E) The number of neutrons The radius of the atom The atomic number The atomic weight The number of oxidation states 95 The elements within each column of the periodic table (A) (B) (C) (D) (E) Have similar valence electron configurations Have similar atomic radii Have the same principal quantum number Will react to form stable elements Have no similar chemical properties 96 Which element has the greatest electronegativity? (A) (B) (C) (D) (E) Chlorine Oxygen Sulfur Phosphorus Fluorine 97 Which of these elements is the most electronegative? (A) (B) (C) (D) (E) S Cl Na Mg P 98 The elements that display the greatest nonmetallic character are located toward which corner of the periodic table? (A) (B) (C) (D) (E) Upper left Dead center Lower right Lower left Upper right 99 Which group contains elements in the solid, liquid and gas phases at 298K and 1 atm? (A) (B) (C) (D) (E) 1 2 16 17 18 100 An element that has a high first ionization energy and is chemically inactive would most likely be (A) (B) (C) (D) (E) A noble gas A transition element An alkali metal A halogen An alkaline earth metal 101 As the elements of period 2 are considered from left to right, there is generally a decrease in (A) (B) (C) (D) (E) Ionization energy Electronegativity Metallic character Nonmetallic character None of the above 102 Which of the following has the greatest affinity for electrons? (A) (B) (C) (D) (E) Na Cl Br K C 103 All members of Group 1A have similar reactivity because (A) They have the same number of protons (B) They have the same number of electrons (C) They have similar outer-shell electron configurations (D) They have valence electrons with the same quantum numbers (E) They have the same number of neutrons 104 Arrange the following elements in order of decreasing nonmetallic character: Ge,Sn,Pb,Si (A) (B) (C) (D) Pb, Sn, Ge, Si Ge, Sn, Pb, Si Si, Ge, Sn, Pb They all have equal nonmetallic character since they are all in the same column of the periodic table (E) None of the above 105 Which of the following is NOT a property of Group IA elements? (A) (B) (C) (D) (E) Low ionization energies Low electronegativities High melting points Metallic bonding Electrical conductivity 106 Which of the following elements would have the largest atomic radius? (A) (B) (C) (D) (E) Cl F Li Ne Na 107 Which of the following elements would have the lowest first ionization energy? (A) (B) (C) (D) (E) Fluorine Oxygen Nitrogen Carbon Boron 108