Practice Test2

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Chemistry

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Feb 20, 2024

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1. [1/1 Points] DETAILS PREVIOUS ANSWERS Using the VSEPR model, predict the molecular geometry of Brf. seesaw trigonal pyramidal trigonal planar tetrahedral ® T-shaped 2. [1/1 Points] DETAILS PREVIOUS ANSWERS Consider the following molecules. 1. BF; II. CHBr3 (C is the central atom) IIL. Br, IV. XeCl, V. CO Select the molecule(s) that have a zero net dipole moment. I, vV ® 1, 11, IV I, IV, V 1, I, 111, IV none of them v 3. [1/1 Points] DETAILS PREVIOUS ANSWERS Which orbital hybridization is associated with a tetrahedral electron group arrangement? sp sp? © [F]s? sp3d 4

4. [1/1 Points] DETAILS PREVIOUS ANSWERS What is the hybridization of the central atom in the following? CF, [chemPad (%] Help‘ Role] [con] sp> v sp3 sp”3 Remember to correctly format your answer using superscripts if appropriate. 5. [1/1 Points] DETAILS PREVIOUS ANSWERS In molecular orbital theory, the o, orbital is and the 0*15 orbital is filled, filled ® filled, empty filled, half-filled half-filled, filled empty, filled v 6. [1/1 Points] DETAILS PREVIOUS ANSWERS Calculate the bond order for an ion with this configuration. (0292026 ) A0 (M3, Tap ) Mo, ") Top, ) in the H, molecule.

7. [1/1 Points] DETAILS PREVIOUS ANSWERS When the dinitrogen molecule, N,, loses an electron, ® the ion formed will be less stable than N,. the ion formed will have a shorter N—N bond than N,. the stability of the ion formed will be the same as that of N,. the bond length of ion will be the same as the bond length of N,. none of the above statements is correct. v 8. [1/1 Points] DETAILS PREVIOUS ANSWERS Sodium chromate, Na,CrO,, is used to protect iron from corrosion and rusting. Which of these is closest to its formula mass? 261.97 amu 238.98 amu ® 161.97 amu 138.98 amu 74.99 amu 9. [0.5/1 Points] DETAILS PREVIOUS ANSWERS (a) How many moles of CO, contain 2.81x1024 molecules? mol CO, (b) How many moles of CO, contain 2.81x 1024 atoms? 17 % 56| mol CO, 10. [0/1 Points] DETAILS PREVIOUS ANSWERS Terephthalic acid is composed of carbon, hydrogen, and oxygen. When 0.6943 g of terephthalic acid was subjected to combustion analysis, it produced 1.471 g CO, and 0.225 g H,0. What is its empirical formula? C,H30, C3H40, C4H30; C4HgO, none of these X

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11. [1/1 Points] DETAILS PREVIOUS ANSWERS In a laboratory experiment, the reaction of 2.60 mol of H, with 1.95 mol of Cl, produced 1.18 mol of HCI. Determine the theoretical yield in grams and the percent yield for this reaction. theoretical yield percent yield « | 7 30.2564102564103| % 12. [1/1 Points] DETAILS PREVIOUS ANSWERS w PClg + x H,0 — y POCl; + z HCl The above equation is properly balanced when: 1,x=2,y=2,z=4 w=2,x=2,y=2,z=2 w=2,x=2y=22z=1 @w=1,x=1,y=1,z=2 none of these v 13. [1/1 Points] DETAILS PREVIOUS ANSWERS Aluminum and oxygen react according to the following equation: 4AI(s) + 30,(g) — 2A1,04(s) In a certain experiment, 4.6 g Al was reacted with excess oxygen and 6.8 g of product was obtained. What was the percent yield of the reaction? ®[Z]78 74 68 63 34 14. [1/1 Points] DETAILS PREVIOUS ANSWERS Calcium nitrate and ammonium fluoride react to form calcium fluoride, dinitrogen monoxide, and water vapor. What mass of dinitrogen monoxide is present after 15.0 g calcium nitrate and 17.50 g ammonium fluoride react completely? 4.02g 20.8¢ 10.4 4.69g ®[7]s.04g 4

15. [1/1 Points] DETAILS PREVIOUS ANSWERS What are the major species in solution when solid ammonium carbonate is dissolved in water? NH,, CO52 NH,*, H,CO,4 NHj, HCO3” @ [Z]NH,*, oz NH,*, CO,% v 16. [1/1 Points] DETAILS PREVIOUS ANSWERS Calculate the molarity (M) of a solution containing 0.215 mol HF in 825 mL of solution. 17. [1/1 Points] DETAILS PREVIOUS ANSWERS What volume of water must be added to 45.0 mL of a 1.00 M solution of H,SO, in order to create a 0.330 M H,SO, solution? Assume volumes are additive. 137 mL 149 mL 33.3mL 100 mL @ [F]ot4mL 4 18. [1/1 Points] DETAILS PREVIOUS ANSWERS The mixing of which pair of reactants will result in a precipitation reaction? ® Cu(NO3),(aq) + Na,CO3(aq) K,S04(aq) + Cu(NO3),(aq) NaClO4(aq) + (NH,4),S(aq) NH4Br(aq) + KI(aq)

19. [1/1 Points] DETAILS PREVIOUS ANSWERS In the reaction AgNO5(aq) + HI(ag) — Agl(s) + HNO3(aq) the spectator ions are Ag* and NO5~ Agtand I~ H* and I ® H* and NO5” There are no spectator ions in this equation v 20. [1/1 Points] DETAILS PREVIOUS ANSWERS If 15.98 mL of a standard 0.1080 M KOH solution reacts with 52.00 mL of CH3;COOH solution, what is the molarity of the acid solution? 1.7258 M CH3COOH 0.00173 M CH3COOH ® 0.03319 M CH3COOH 0.3073 M CH;COOH v 21. [0/1 Points] DETAILS ldREVIOUS ANSWERS 1+ 2 Identify the I)xidizkg ent.and the reducing agent in the following: | (i) 8H*(ag) + [Cr,0,1% (aq) + 3503,-(aq) — 2Cr3*(aq) + 350, (ag) + 4H,0(/) (i) NO3™(ag) + 4Zn(s) + 70H™(aq) + 6H,0(/) — 4Zn(OH)42'(aq) + NH3(aq) (i) ox. agent = [Cr207]2', red. agent = H~+ (i) ox. agent = NO3”, red agent = Zn <% (i) ox. agent = [Cr207]2', red. agent = 5032' (ii) ox. agent = NO3", red agent = Zn (i) ox. agent = 5032', red. agent = [Cr207]2' (ii) ox. agent = NO3", red agent = Zn ® (i) ox. agent = 5032', red. agent = [Cr207]2' (ii) ox. agent = Zn, red agent = NO3~ None of these

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22. [0/1 Points] DETAILS PREVIOUS ANSWERS -y When the equation below is balanced with the smallest set of coefficients, what is the coefficient of NH4NO3} & H __2 Zn + HNO3 — Zn(NO3), + NH4NO3 + H,0 (not balanc,ed) s-'r" ,_ $3 -4 1S 7 (\, \ D 452 —+\ @ 1 (no coefficient written) v\ . H N p —-}2\0‘0}\ -2 “N n‘iN 3 \\.b 2 ® 4 6 None of these 23. [1/1 Points] DETAILS PREVIOUS ANSWERS After balancing the following redox equation, the sum of the stoichiometric coefficients on the right-hand side of the equation is: cu2*(aq) + Ce3*(aq) + H,0(/) — CeO,(s) + Cu(s) + H*(aq) [not balanced]