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Test bank Chapter 5,7,8,9 ليلى الحربي.إعداد د Dr.Laila Al-Harbi Which is correct? 1. All gases are fluids. 2. All gases are diatomic. a. Both statements are true. b. Both statements are false. c. Statement 1 is true, but statement 2 is false. d. Statement 1 is false, but statement 2 is true. Dr.Laila Al-Harbi As a helium-filled balloon rises, its volume increases. This is an example of: a. b. c. d. Avogadro’s Law. Boyle’s Law. Charles’ Law. Gay-Lussac’s Law. Dr.Laila Al-Harbi Hot air balloons rise. This is an example of: a. b. c. d. Avogadro’s Law. Boyle’s Law. Charles’ Law. Gay-Lussac’s Law. Dr.Laila Al-Harbi Avogadro’s Law states that the volume of a gas is directly proportional to: a. b. c. d. the number of gas particles. the mass of the gas. the pressure of the gas. the Kelvin temperature of the gas. Dr.Laila Al-Harbi Standard temperature and pressure (STP) for a gas is: a. b. c. d. 0 atmospheres and 25 degrees C. 1 atmosphere and 0 degrees C. (273 K) 1 atmosphere and 25 degrees C. 0 atmospheres and 0 degrees C. Dr.Laila Al-Harbi The partial pressure of each gas in a mixture is proportional to: a. the mass of the gas. b. the molecular weight of the gas. c. the square root of the molecular weight of the gas. d. the mole fraction of the gas. Dr.Laila Al-Harbi 4. Under conditions of fixed temperature and amount of gas, Boyle's law requires that I. P1V1 = P2V2 II. PV = constant III. P1/P2 = V2/V1 (a) I only (b) II only (c) III only (d) I, II, and III (e) another combination Dr.Laila Al-Harbi A sample of two moles of nitrogen gas (N2) will occupy what volume at STP? PV=nRT = 2x0.082x273/1= a. b. c. d. 11.2 liters 22.4 liters 44.8 liters 89.6 liters Dr.Laila Al-Harbi • A sample of hydrogen gas was collected over water at 21C and 0.9 atm. The volume of the container was 7.80 L. Calculate the mass of H2(g) collected. (Vapor pressure of water = 0.025 atm at 21C.) • (A) 0.283 g • (B) 435 g • (C) 0.571 g • (D) 7.14 g Dr.Laila Al-Harbi If 250 mL of NO is placed in a flask with O2, what volume of O2 is needed for complete reaction? 2 NO (g) + O2 (g) 2 NO2 (g) From the equation because all reactant are gases 250 x1 /2 = 125 • • • • • 100 mL 125 mL 200 mL 250 mL Cannot be determined from the given information. Dr.Laila Al-Harbi If an equal mass of each gas is put into a separate balloon, which will have the greatest volume? Assume that they are all the same temperature and pressure. • • • • • He (ℳ =2) H2 (ℳ =1) N2 (ℳ =28) Ne (ℳ =20) O2 (ℳ =32) Assume that they are all the same temperature and pressure. PV =(m/ℳ ) RT → V ⋉ 1/ ℳ Sine all other variables are constants Dr.Laila Al-Harbi If equal masses of CH4, C2H6, and C3H8 are placed in a flask, which of the following is true? • • • • • PCH4 = PC2H6 = PC3H8 PCH4 ~ PC2H6 ~ PC3H8 PCH4 > PC2H6 > PC3H8 PCH4 < PC2H6< PC3H8 None of the above PV =(m/ℳ ) RT Dr.Laila Al-Harbi Chapter 7 Dr.Laila Al-Harbi The wavelength of electromagnetic energy multiplied by its frequency equals: ν = c/λ → ν λ=c a. b. c. d. c, the speed of light h, Planck’s constant Avogadro’s number 4.184 Dr.Laila Al-Harbi The energy of a photon of electromagnetic energy divided by its frequency equals: E =hν → E/ν = h a. b. c. d. c, the speed of light h, Planck’s constant Avogadro’s number 4.184 Dr.Laila Al-Harbi Light that contains colors of all wavelengths is called: a. b. c. d. a continuous spectrum. monochromatic. a line spectrum. a Balmer series. Dr.Laila Al-Harbi The lowest energy state of an atom is referred to as its: a. b. c. d. bottom state. ground state. fundamental state. original state. Dr.Laila Al-Harbi All s orbitals are: a. b. c. d. shaped like four-leaf clovers. dumbbell-shaped. spherical. triangular. Dr.Laila Al-Harbi The way electrons are distributed among the various orbitals of an atom is referred to as the atom’s: a. b. c. d. orbital diagram. electron configuration. electron distribution. electron spread. Dr.Laila Al-Harbi [He]2s22p2 is the electron configuration of which element? a. b. c. d. beryllium boron carbon nitrogen Dr.Laila Al-Harbi Considering only the n = 1 to n = 5 states in the hydrogen atom, which transition will emit the longest wavelength? • • • • • n = 5 to n = 4 n = 5 to n = 2 n = 3 to n = 1 n = 3 to n = 2 n = 4 to n = 2 E =hν → E & h are directly proportional E =hc/λ → E & λ are inversely proportional Dr.Laila Al-Harbi What are the valence electrons of vanadium (V)? • • • • • 4s2 3d3 4s23d3 3d5 4d5 Dr.Laila Al-Harbi What are the valence electrons of gallium Ga? • • • • • 4s2 4p1 4s23d104p1 4s23d10 4s24p1 Dr.Laila Al-Harbi What is the maximum number of orbitals described by the quantum numbers: • • • • • 1 3 5 8 9 n=3 l=2 the maximum number of orbitals = 2ℓ+1=2x2+1=5 Dr.Laila Al-Harbi What is the maximum number of electrons described by the quantum numbers: • • • • • 7 14 16 32 48 n=4 the maximum number of electrons = 2n2 =2(4) 2 =32 Dr.Laila Al-Harbi How many unpaired electrons does selenium Se have? • • • • • 4s24p4 0 2 4 6 8 Dr.Laila Al-Harbi How many unpaired electrons does chromium have? • • • • • 0 2 4 6 8 4s13d5 Dr.Laila Al-Harbi The electron configuration of a neutral atom is [Ne] 3s2 3p1. The four quantum numbers of the last electron are: (A) (2, 1, -1, +1/2) (B) (3, 3, -1 , +1/2) (C) (3, 0, -1, +1/2) (D) (3, 1, -1, +1/2 )# Dr.Laila Al-Harbi Chapter 8 Dr.Laila Al-Harbi - Selenium (34Se) element is: (a) a nonmetal (b) found in group 6A (c) both a and b Dr.Laila Al-Harbi • The outer electron configuration of the noble gases is (a) ns2 np6 (b) ns2 nd10 (c) ns2 np4 • Which of the following species is isoelectronic with Cl(a) F(b) O2(c) K+ (d) Na+ Dr.Laila Al-Harbi -Which of the following sets of elements is expected to have similar chemical properties? a) Sulfur and phosphorous b) Sulfur and oxygen c) Sulfur and argon Dr.Laila Al-Harbi Gallium (Ga) element is found in the periodic table in (a) period 3, group 1B (b) period 3A, group 4 (c) period 4, group 1A (d) period 4, group 3A Dr.Laila Al-Harbi Titanium (Ti) element is found in the periodic table in (a) (b) (c) (d) s-block P-block d-block f-block Dr.Laila Al-Harbi Choose the incorrect quantum numbers for electron in an atom. A) (3, 0, 0, +1/2). (B) (4, 3, –2, +1/2). (C) (1, 0, -1, -1/2). Correct (1,0,0,-1/2) (D) (3, 2, 0, +1/2) ( Dr.Laila Al-Harbi • Write the electronic configuration for Co2+ (a) [Ar] 4s2 3d5 (b) [Ar] 3d7 (c) [Ar] 4s1 3d6 Select the correct order of radius of the two ions (A) A+ > A(B) A- < A (C) A2+ > A+ (D) A2+ < A+ Dr.Laila Al-Harbi Which choice below correctly lists the elements in order of increasing atomic radii? a. b. c. d. Na < Mg < K < Rb Mg < Na < K < Rb Rb < K < Na < Mg Rb < K < Mg < Na Dr.Laila Al-Harbi Two ions are referred to as isoelectronic if they have the same number of: a. b. c. d. electrons. protons. atoms. neutrons. Dr.Laila Al-Harbi Which statement is false? a. Fluoride ions are larger than rubidium ions. b. Bromide ions are larger than sodium ions. c. Iodide ions are larger than rubidium ions. d. Chloride ions are larger than potassium ions. Dr.Laila Al-Harbi The energy required to remove an electron from an atom in its ground state is known as the: a. b. c. d. potential energy. activation energy. electron affinity. ionization energy. Dr.Laila Al-Harbi Which choice correctly lists the elements in order of increasing electron affinity (most negative to least negative)? a. b. c. d. O, Cl, B, C O, Cl, C, B Cl, O, C, B Cl, O, B, C Dr.Laila Al-Harbi Which choice correctly lists the elements in order of increasing first ionization energy? a. b. c. d. Na < Ca < Al < Sn Na < Al < Ca < Sn Na < Al < Sn < Ca Ca < Na < Sn < Al Dr.Laila Al-Harbi An unknown solid gives a green flame test. When it was dissolved in water and reacted with NaOCl, a purple color appeared. The unknown is: a. b. c. d. barium bromide. calcium iodide. barium iodide. calcium bromide. Dr.Laila Al-Harbi Characteristics of noble gases include: a. b. c. d. filled s and p subshells. monatomic gases. generally unreactive chemically. all of the above. Dr.Laila Al-Harbi In an germanium atom, which electron will experience the greatest effective nuclear charge? An electron in a 1. 2. 3. 4. 5. 2s orbital. 2p orbital. 3s orbital. 3p orbital. 3d orbital. Dr.Laila Al-Harbi Order the following according to increasing atomic/ionic radius. 1. 2. • • • N3– Li+ C O2– C < Li+ < O2– < N3– N3– < O2– < C < Li+ Li+ < C < N3– < O2– Li+ < C < N3– < O2– Li+ < C < O2– < N3– Dr.Laila Al-Harbi Which will have the highest ionization energy? • • • • • C N O Al Si Dr.Laila Al-Harbi Which will be the largest? I = ionization energy • • • • • I1 of Na I2 of Na I1 of Mg I2 of Mg I3 of Mg Dr.Laila Al-Harbi Chapter 9 Dr.Laila Al-Harbi The two types of chemical bonds commonly found in compounds are: a. b. c. d. doric and covalent. ionic and electrolytic. ionic and covalent. electrolytic and compound. Dr.Laila Al-Harbi The electrons used by atoms to form chemical bonds are the: a. b. c. d. core electrons. valence electrons. lone pair electrons. unpaired electrons. Dr.Laila Al-Harbi “Atoms tend to gain, lose, or share electrons until they are surrounded by eight valence electrons” is a statement of: a. b. c. d. the rule of octaves. the double quartet rule. the eight electron rule. the octet rule. Dr.Laila Al-Harbi When a transition metal atom becomes a +1 ion, the electron lost usually comes from what type of orbital? a. b. c. d. p f d s Dr.Laila Al-Harbi A molecule of CS2 contains: a. b. c. d. two single bonds. two double bonds. one single bond and one double bond. one single bond and one triple bond. Dr.Laila Al-Harbi • An atom in the ground state has atomic number Z=5. Choose the correct electron-dot structure which represents this atom? (A) X (B) X (C) X (D) X Dr.Laila Al-Harbi What is the formal charge on the nitrogen atom in the nitrate ion (NO3–1) ? a. b. c. d. +2 +1 0 –1 Dr.Laila Al-Harbi Which compound below contains an atom that is surrounded by more than an octet of electrons? a. b. c. d. PF5 CH4 NBr3 OF2 Dr.Laila Al-Harbi Which choice below correctly lists the elements in order of increasing electronegativity? a. b. c. d. C<N<O<F N<C<O<F N<C<F<O C<N<F<O Dr.Laila Al-Harbi As the number of bonds between two atoms increases, the distance between the atoms: a. b. c. d. increases. decreases. remains unchanged. varies with the atoms involved. Dr.Laila Al-Harbi Which atom sometimes violates the octet rule? 1.C 2.N 3.O 4.F 5.S Dr.Laila Al-Harbi Order the following according to increasing atomic radius. Ge Si Se Cl 1. 2. 3. 4. 5. Ge < Si < Se < Cl Se < Si < Ge < Cl Si < Cl < Ge < Se Cl < Si < Se < Ge Si < Ge < Se < Cl Dr.Laila Al-Harbi What is the electronic configuration of Fe2+? 1. 2. 3. 4. 5. 4s23d4 4s13d5 3d5 3d6 4s23d8 Dr.Laila Al-Harbi How many unpaired electrons are there in Cu+? 1. 2. 3. 4. 5. 0 1 2 3 4 Dr.Laila Al-Harbi How many resonance structures can be drawn for NO3–? 1.1 2.2 3.3 4.4 5.5 Dr.Laila Al-Harbi •An atom in the ground state has atomic number Z=5. Choose the correct electron-dot structure which represents this atom? Considering formal charge, what is the preferred Lewis structure of NCO–? Dr.Laila Al-Harbi : : : _ _ : : • In Lewis structure of (SO4)-2structure the correct formal charge on sulfur (S) is: a) +2 b) -2 :O: +2 c) +1 6 4 _ d) 0 - : :O: Dr.Laila Al-Harbi +2