Download StraighterLine chemistry Exam 2 (Chpt. 4-6) with verified answers and more Exams Chemistry in PDF only on Docsity!
StraighterLine |! chemistry |! Exam |! 2 |!
(Chpt. |! 4-6) |! with |! answers
Which |! of |! the |! following |! is |! soluble |! in |! water? a. |! AgCl b. |! Rb2CrO c. |! Hg2I d. |! CaSO e. |! PbBr2 |! - |! Correct |! answer |! ✔b. |! Rb2CrO Based |! on |! the |! solubility |! rules, |! which |! of |! these |! processes |! will |! occur |! if |! solutions |! of |! CuSO4(aq) |! and |! BaCl2(aq) |! are |! mixed? Select |! one: a. |! CuCl2 |! will |! precipitate; |! Ba2+ |! and |! SO42- |! are |! spectator |! ions. b. |! CuSO4 |! will |! precipitate; |! Ba2+ |! and |! Cl- |! are |! spectator |! ions. c. |! BaSO4 |! will |! precipitate; |! Cu2+ |! and |! Cl- |! are |! spectator |! ions. d. |! BaCl2 |! will |! precipitate; |! Cu2+ |! and |! SO42- |! are |! spectator |! ions. e. |! No |! precipitate |! will |! form. |! - |! Correct |! answer |! ✔c. |! BaSO4 |! will |! precipitate; |! Cu2+ |! and |! Cl- |! are |! spectator |! ions.
Which |! is |! the |! net |! ionic |! equation |! for |! the |! reaction |! between |! aqueous |! solutions |! of |! lithium |! hydroxide |! and |! hydrobromic |! acid?LiOH(aq) |! + |! HBr(aq) |! → |! H2O(l) |! + |! LiBr(aq) Select |! one: a. |! LiOH(aq) |! → |! Li+(aq) |! + |! OH-(aq) b. |! HBr(aq) |! → |! H+(aq) |! + |! Br-(aq) c. |! H+(aq) |! + |! OH-(aq) |! → |! H2O(l) d. |! Li+(aq) |! + |! Br-(aq) |! → |! LiBr(aq) e. |! Li+(aq) |! + |! OH-(aq)+ |! H+(aq) |! + |! Br-(aq) |! → |! H2O(l) |! + |! LiBr(aq) |! - |! Correct |! answer |! ✔c. |! H+(aq) |! + |! OH-(aq) |! → |! H2O(l) Which |! salt |! is |! formed |! in |! the |! neutralization |! reaction |! of |! hydrochloric |! acid |! with |! calcium |! hydroxide? Select |! one: a. |! CaO b. |! CaCl c. |! CaH d. |! CaCl e. |! NaCl |! - |! Correct |! answer |! ✔d. |! CaCl Based |! on |! the |! solubility |! rules, |! which |! one |! of |! these |! compounds |! is |! insoluble |! in |! water?
e. |! -2 |! - |! Correct |! answer |! ✔c. |! - ½ Identify |! the |! reducing |! agent |! in |! the |! chemical |! reaction |! Cd |! + |! NiO2 |! + |! 2H2O |! → |! Cd(OH)2 |! + |! Ni(OH) Select |! one: a. |! Cd b. |! NiO c. |! H2O d. |! Cd(OH) e. |! Ni(OH)2 |! - |! Correct |! answer |! ✔a. |! Cd For |! the |! reaction |! depicted |! below, |! if |! Z |! represents |! Zn, |! which |! metal |! could |! A |! represent? Select |! one: a. |! Fe b. |! Co c. |! Pb d. |! Ca e. |! Cu |! - |! Correct |! answer |! ✔d. |! Ca
A |! 1.00-g |! sample |! of |! octane |! (C8H18) |! is |! burned |! in |! a |! bomb |! calorimeter |! that |! has |! a |! heat |! capacity |! of |! 5.80 |! kJ/°C. |! The |! temperature |! of |! the |! calorimeter |! rises |! from |! 25.00oC |! to |! 33.20oC. |! What |! is |! ΔU |! per |! mole |! for |! the |! combustion |! of |! octane? Select |! one: a. |! -47.6 |! kJ/mol b. |! -416 |! kJ/mol c. |! -707 |! kJ/mol d. |! -5.43 |! ×103 |! kJ/mol e. |! -1.86 |! ×105 |! kJ/mol |! - |! Correct |! answer |! ✔d. |! -5.43 |! × 103 |! kJ/mol When |! 0.7521 |! g |! of |! benzoic |! acid |! was |! burned |! in |! a |! calorimeter |! containing |!
- |! g |! of |! water, |! a |! temperature |! rise |! of |! 3.60°C |! was |! observed. |! What |! is |! the |! heat |! capacity |! of |! the |! bomb |! calorimeter, |! excluding |! the |! water? |! The |! heat |! of |! combustion |! of |! benzoic |! acid |! is |! -26.42 |! kJ/g. Select |! one: a. |! 15.9 |! kJ/°C b. |! 4.2 |! kJ/°C c. |! 5.5 |! kJ/°C d. |! 1.3 |! kJ/°C e. |! 752 |! kJ/°C |! - |! Correct |! answer |! ✔d. |! 1.3 |! kJ/°C
a. |! warm |! up. b. |! become |! acidic. c. |! expand. d. |! decrease |! its |! temperature. e. |! release |! CO2. |! - |! Correct |! answer |! ✔a. |! warm |! up. A |! glass |! containing |! 200.0 |! g |! of |! H2O |! at |! 20.0°C |! was |! placed |! in |! a |! refrigerator. |! The |! water |! loses |! 11.7 |! kJ |! as |! it |! cools |! to |! a |! constant |! temperature. |! What |! is |! its |! new |! temperature? |! The |! specific |! heat |! of |! water |! is |! 4.184 |! J/g·°C. Select |! one: a. |! 0.0°C b. |! 4.0°C c. |! 6.0°C d. |! 14.0°C e. |! 34.0°C |! - |! Correct |! answer |! ✔c. |! 6.0°C The |! combustion |! of |! pentane |! produces |! heat |! according |! to |! the |! following |! thermochemical |! equation. C5H12(l) |! + |! 8O2(g) |! → |! 5CO2(g) |! + |! 6H2O(l) |! ΔH°rxn= |! -3510 |! kJ/mol How |! many |! grams |! of |! CO2 |! is |! produced |! per |! 2.50 |! × |! 103 |! kJ |! of |! heat |! released? Select |! one: a. |! 6.27 |! g
b. |! 31.3 |! g c. |! 61.8 |! g d. |! 157 |! g e. |! 220 |! g |! - |! Correct |! answer |! ✔d. |! 157 |! g Ozone |! (O3) |! in |! the |! atmosphere |! can |! be |! converted |! to |! oxygen |! gas |! by |! reaction |! with |! nitric |! oxide |! (NO). |! (Nitrogen |! dioxide |! is |! also |! produced |! in |! the |! reaction.) |! What |! is |! the |! enthalpy |! change |! when |! 8.50 |! L |! of |! ozone |! at |! a |! pressure |! of |! 1.00 |! atm |! and |! 25°C |! reacts |! with |! 12.00 |! L |! of |! nitric |! oxide |! at |! the |! same |! initial |! pressure |! and |! temperature |! (R |! = |! 0.0821 |! L |! atm/mol |! K)? |! [ΔH°f(NO) |! = |! 90.4 |! kJ/mol; |! ΔH°f(NO2) |! = |! 33.85 |! kJ/mol; |! ΔH°f(O3) |! = |! 142.2 |! kJ/mol] Select |! one: a. |! -69.1 |! kJ b. |! -19.7 |! kJ c. |! -1690 |! kJ d. |! -97.6 |! kJ e. |! -167 |! kJ |! - |! Correct |! answer |! ✔a. |! -69.1 |! kJ Which |! element |! has |! the |! following |! ground-state |! electron |! configuration? [Kr]5s24d105p Select |! one: a. |! Sn b. |! Sb
Select |! one: a. |! the |! Pauli |! exclusion |! principle. b. |! Bohr's |! equation. c. |! Hund's |! rule. d. |! de |! Broglie's |! relation. e. |! Dalton's |! atomic |! theory. |! - |! Correct |! answer |! ✔c. |! Hund's |! rule. The |! ground-state |! electron |! configuration |! for |! an |! atom |! of |! indium |! is Select |! one: a. |! [Kr]5s24p64d5. b. |! [Ar]4s23d104p1. c. |! [Ar]4s24p63d5. d. |! [Kr]5s25p64d5. e. |! [Kr]5s24d105p1. |! - |! Correct |! answer |! ✔e. |! [Kr]5s24d105p1. Hund's |! rule |! states |! that |! the |! most |! stable |! arrangement |! of |! electrons |! in |! orbitals |! of |! equal |! energy |! is |! the |! one |! in |! which |! the |! number |! of |! electrons |! with |! parallel |! spin |! is |! ______________. Select |! one: a. |! minimized b. |! nullified
c. |! neutral d. |! maximized e. |! not |! relevant |! - |! Correct |! answer |! ✔d. |! maximized The |! shape |! of |! an |! atomic |! orbital |! is |! associated |! with Select |! one: a. |! the |! principal |! quantum |! number |! (n). b. |! the |! angular |! momentum |! quantum |! number |! (l). c. |! the |! magnetic |! quantum |! number |! (ml). d. |! the |! spin |! quantum |! number |! (ms). e. |! the |! magnetic |! and |! spin |! quantum |! numbers, |! together. |! - |! Correct |! answer |! ✔b. |! the |! angular |! momentum |! quantum |! number |! (l). The |! electronic |! structure |! 1s22s22p63s23p64s23d8 |! refers |! to |! the |! ground |! state |! of Select |! one: a. |! Kr. b. |! Ni. c. |! Fe. d. |! Pd. e. |! None |! of |! these |! choices |! is |! correct. |! - |! Correct |! answer |! ✔b. |! Ni.
