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CHEM |! 151 |! Exam |! 2 |! with |! accurate |!
detailed |! solutions
A |! soluble |! molecular |! compound |! has |! the |! ability |! to |! conduct |! electricity: |! True |! or |! False? |! - |! Correct |! answer |! ✔False Which |! of |! the |! following |! is |! (are) |! example(s) |! of |! a |! weak |! electrolyte? a. |! HCl b. |! NH c. |! KOH d. |! HCN e. |! b |! and |! c f. |! b |! and |! d |! - |! Correct |! answer |! ✔f. |! b |! and |! d A |! reaction |! that |! takes |! place |! in |! an |! aqueous |! solution |! and |! results |! in |! the |! production |! of |! a |! solid |! substance |! is |! an |! example |! of |! a |! ___ |! reaction. |! - |! Correct |! answer |! ✔precipitation When |! AgNO3 |! reacts |! with |! HCl |! the |! products |! are: a. |! H2 |! (g) b. |! nitric |! acid c. |! AgCl |! (s) d. |! AgCl |! (aq) e. |! b |! and |! c
f. |! b |! and |! d |! - |! Correct |! answer |! ✔e. |! b |! and |! c What |! is |! the |! net |! ionic |! equation |! when |! HC2H3O2 |! reacts |! with |! NaOH? a. |! HC2H3O2 |! (aq) |! + |! NaOH |! (aq) |! →C2H3O2Na |! (aq) |! + |! H2O |! (l) b. |! H^+ |! (aq) |! + |! OH^- |! (aq) |! →H2O |! (l) c. |! HC2H3O2 |! (aq) |! + |! 2OH^- |! (aq) |! → |! C2H3O2^- |! (aq) |! + |! 2H2O |! (l) d. |! HC2H3O2 |! (aq) |! + |! OH^- |! → |! C2H3O2^- |! (aq) |! + |! H2O |! (l) |! - |! Correct |! answer |! ✔d. |! HC2H3O2 |! (aq) |! + |! OH^- |! → |! C2H3O2^- |! (aq) |! + |! H2O |! (l) True |! or |! false: |! Ba(OH)2 |! is |! insoluble |! in |! water |! - |! Correct |! answer |! ✔false A |! Bronsted-Lowry |! acid/base |! reaction |! is |! best |! defined |! as: a. |! combination |! reaction b. |! redox |! reaction c. |! loss |! of |! a |! proton d. |! a |! proton |! transfer |! reaction |! - |! Correct |! answer |! ✔d. |! a |! proton |! transfer |! reaction A |! diprotic |! acid |! has |! ___ |! acidic |! protons. a. |! many b. |! 2 c. |! 3 d. |! 4 |! - |! Correct |! answer |! ✔b. |! 2 The |! gas |! formed |! when |! Na2S |! reacts |! with |! H2SO4 |! is: a. |! SO b. |! SO
c. |! 0.0400 |! L d. |! 400. |! mL e. |! none |! of |! the |! above |! - |! Correct |! answer |! ✔c. |! 0.0400 |! L Kinetic |! energy |! is |! defined |! as |! the |! energy |! of |! ___ |! - |! Correct |! answer |! ✔movement The |! kinetic |! energy |! of |! a |! 151 |! lb |! person |! with |! a |! velocity |! of |! 2.0 |! m/s |! is: |! (given |! 1 |! lb=0.4536 |! kg) a. |! 1.4 |! X |! 10^2 |! J b. |! 1.4 |! X |! 10^-2 |! kgm^2/s^ c. |! 1.4 |! X |! 10^-2 |! J d. |! 1.4 |! X |! 10^2 |! kgm^2/s^ e. |! a |! and |! d f. |! b |! and |! c |! - |! Correct |! answer |! ✔e. |! a |! and |! d The |! change |! in |! enthalpy |! is |! negative |! when |! an |! endothermic |! reaction |! takes |! place. |! T |! or |! F |! - |! Correct |! answer |! ✔False In |! an |! exothermic |! reaction |! the |! system |! ___ |! energy |! and |! the |! surroundings |! ___ |! energy. |! - |! Correct |! answer |! ✔releases, |! absorbs Calculate |! the |! quantity |! of |! heat |! require |! (q) |! to |! raise |! the |! temperature |! of |! a |! 0.103 |! g |! sample |! of |! Cu |! by |! 10.0 |! degrees |! Celsius |! given |! at |! a |! specific |! heat |! of |! 0.3844 |! J/gC a. |! 0.0396 |! J b. |! 03.84 |! J c. |! 0.3955 |! J d. |! 0.396 |! X |! 10^2 |! kJ e. |! 0.396 |! J |! - |! Correct |! answer |! ✔e. |! 0.396 |! J
Given |! that |! a |! 15.0 |! g |! sample |! of |! NaNO3 |! dissolved |! in |! water |! caused |! the |! temperature |! of |! a |! calorimeter |! to |! fall |! from |! 25.0 |! degrees |! C |! to |! 21.56 |! degrees |! C |! and |! that |! the |! Ccal= |! 1071 |! J/C, |! the |! change |! in |! enthalpy |! of |! the |! reactions |! is |! - |! Correct |! answer |! ✔2.09 |! X |! 10^4 |! J Internal |! energy, |! U |! is |! best |! defined |! as: a. |! the |! sum |! of |! the |! kinetic |! energy |! and |! potential |! energies |! of |! all |! particles |! making |! up |! a |! substance b. |! the |! total |! sum |! of |! all |! energies |! contained |! within |! a |! system c. |! positional |! energy d. |! the |! energy |! contained |! within |! the |! nucleus |! of |! an |! atom |! - |! Correct |! answer |! ✔a. |! the |! sum |! of |! the |! kinetic |! energy |! and |! potential |! energies |! of |! all |! particles |! making |! up |! a |! substance Delta |! H |! for |! CH4 |! (g) |! given |! the |! following |! thermochemical |! equation; |! CH4 |! (g) |! + |! 2O2 |! (g) |! → |! CO2 |! (g) |! + |! 2H2O |! (g); |! Delta |! H |! of |! the |! reaction |! is |! -802.34 |! kJ |! and |! delta |! H |! of |! H2O |! (g) |! is |! - 241.82 |! kj/mol, |! delta |! H |! of |! CO2 |! is |! -393.5 |! kJ/mol |! is |! : |! - |! Correct |! answer |! ✔-74.8 |! kJ/mol Which |! of |! the |! following |! are |! not |! allowable |! units |! for |! heat |! capacity, |! C: a. |! kJ/°C b. |! J/°C c. |! g/°C d. |! J/mol e. |! c |! and |! d f. |! a |! and |! b |! - |! Correct |! answer |! ✔e. |! c |! and |! d The |! energy |! of |! a |! photon |! of |! light |! is |! always |! a |! positive |! value |! T |! or |! F |! - |! Correct |! answer |! ✔T
The |! photon |! of |! light |! having |! an |! energy |! of |! 3.50 |! X |! 10^-19 |! J |! corresponds |! to |! visible |! light |! T |! or |! F |! - |! Correct |! answer |! ✔T
