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Unformatted text preview: No Marks. To determine what portion of the qualion you have correct, check qnaﬁon score at the top of the assignment.
Indicate whether A50 '6 large and positive' large and negative, or nearly Zero in each of the following reactions: Reaction AS” My) + 02(9) + Mm —" em
HFtaq) + "02"(aq) a F"(aq) + HNOztaq) _~’ 9%
"2(9) + 2H2(9) a N2H4tg) —~I @
Cacoﬁs) a Ca0(s) + coz(g) —« @ Use the Table of Bond Energies or Table 9.2 on page 189 of your textbook to estimate the value of AH“ at 298 K for the following reaction: ZNHatg) —> 3H2I19) + N2(g} AH“ = -X E97 k.)
" | AS" is expected to he
The reaction would be extensive at —" I Consider the reaction C2H4(g) + HCI(g) ,) C2H5€l(g). Use the Table of Bond Energies or Table 9.2 on page 139 of your textbook to estimate the value of AHD at 29!! K. .X E745 kJ AS“ Is expected to be " I
The reaction would be extensive at —V I Which of the following statements conectzly describes an exothermic process? Q Q it has a negative value for AH and the surroundings heat up
0 it has a negative value for AH and the surroundings cool down
0 it has a positive value for AH and the surroundings cool down 0 it has a positive value for AH and the surroundings heat up Use the Table of Bond Energies or Table 9.2 on page 139 of your textbook to estimate the enthalpy change in each of the following reactions:
(Be sure to draw the correct Lewis Structures for products and reactants.) Reaction AH (kJ)
HZCBrzw) + F2(g) —> Hzcrztg) + Br2(g) -« HE
lCHa(g) + H20(g) —> HaCDH(g) + [11(9) I! BE
HC—=CH(9) + 2H2(g) —> HaC*EHa(g) -« E CH4(9) —> 0190+ 2H2(9) .V E780 The combustion of hydrocarbons (compounds containing only hydrogen and carbon) involve the reaction of the hydrocarbon with oxygen gas to form carbon dioxide
and water. The enﬂialpy of combmﬁon of one mole of propane gas, C3Hg(g), 'E *2,2I)D kJInIoI. What is the enthalpy change for 12 C02(g) + 16 H20“) 4:4 Cst(g) + 20 02(9)?
Hint : Don't forget our d'EcLEsion about scale and direcljon of reacﬁom. -X Emma k) No Marks. To determine what portion of the qualion you have correct, clleclr qnaﬁon score at the top of the assignment. The sign of AH” for ﬁle:
a) evaporation of H20 is: I
b)freezing of H20 is:
c)5ublimalion of H20 is:
I d)wannhg of water from 45 degrees C to 65 degrees C is:
E) , ®@+ Indicate the Sign of A50 for each reaction: 2H2(9) + 02(9) —> 214200)
0 A50 m o O A50<o 0 Asu>u l—F(aq) + mzlxaq) —> Fixaq) + HNDAaq)
Q As“ m D O A50<o O A50>o H2(9) + 12(9) A ZHIIIQ)
0 A50 < o O Asa-vi) C) A50>D 2503(9) a 2502(9) + 02(9)
0 A50 < D Q A50>o O Asa-no No Marks. To determine what portion of the qualion you have correct, check quation score at the top of the assignment.
Indicate the sign of A5“ at low and high temperatures for the following reaction-3: Reaction Low T ngll T
NH3(g) + HC|(g) —> NH4€|(5) AHo < n -v HE -w/ HE
CaCDﬂs) —> Ca0(5) + C02(g) AHO > D -\I BE -~/ HQ
W(.)-...DH(.} —« HE —« E:
202(9) + 702(9) —> 202070) AH“ > o -\I HE -J HE Consider the following thermochemical equation: Cacoﬂs} A Ca0(5) + C02 AHD : +178 Id How much heat must be absorbed by 30.5 g of Cacoa to convert it completely to CaO? -\’ 954.29 kJ Home My Assignments ...
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- Fall '08