Page 310 - Chemistry eBook

2C8H 2CH3
C2H5
Br2 I2
) + 2O (g) CO (g) + 2H O(􏰀) –890.4 Li 42 Given the reaction at 101.3 kilopascals and 298 K:
222
(g) + 5O (g) 3CO (g) h+y4dHrogOen(􏰀g)as + iodine–g2a2s1→9.2hydrogen iodide gasR 222
This reaction is classified as
18(􏰀) + 25O2(g) 16CO2(g) + 18H2O(􏰀) –10943 K
(1) endothermic, because heat is absorbed
OH(􏰀) + 3O2(g) 2CO2(g) + 4H2O(􏰀) –1452 Cs
C6H1262 22 2CO(g) + O (g) 2CO (g)
H + I 2HI. The ∆H is +53.0 kJ. 22
H NaOH(s) 2
absorb energy.
A
NH4Cl(s) H2O
Time (min)
+25.69 Ag
NH4NO3(s)
H2O
+ – NH4 (aq) + NO3 (aq)
224
F
E Sn
Table I
Table J
Heats of Reaction at 101.3 kPa and 298 K
Activity Series** Most Metals Nonmetals
CH4(g C3H8bCl2
Sample Regents Questions
Reaction ∆H (kJ)*
Active F2
(2) endothermic, because heat is released (3) exothermic, because heat is absorbed
OH(􏰀) + 3O2(g) 2CO2(g) + 3H2O(􏰀) –1367 Ba
(4) exothermic, because heat is released
O (s) + 6O (g) 6CO (g) + 6H O(􏰀) –2804 Sr
–566.0 Ca C(s) + O2(g) CO2(g) Jan 2011 #42 –393.5 Na
43 G2iven the equation2:
HHHHHH HHHHHH
4Al(s) + 3O2(g) 2Al2O3(s) –3351 Mg CC+CC+CC CCCCCC
N2(g) + O2(g) 2NO(g) +182.6 Al HHHHHH HHHHHH
N2(g) + 2O2(g) 2NO2(g) Answer +66.4 Ti Which type of reaction is represented by this equation?
2H2(g) + O2(g) 2H2O(g)
–483.6 Mn (3) polymerization
(1) combustion 2H (g) + O (g) (2)HesOte(r􏰀i)fication
–571.6 (4) substitution Zn
222
Choice #4
N2(g) + 3H2(g) 2NH3(g)
–91.8 Cr
44 The graph below represents the uniform heating of a sample of a substance starting as a solid belo
2C(s) + 3H (g) C H (g) –84.0 m2elting point. 2 6
Fe Co Ni
Explanation: Check out the equation on Reffy, Table (p. 5):
2C(s) + 2H (g) C H (g) +52.4
2C(s) + H2(g) C2H2(g) +227.4
H2(g) + I2(g) 2HI(g) +53.0
KNO3(s)
H2O+ –
A positive ∆
+34.89
Pb
NaCl(s)
+
Which– statement describes what happens to the energy of the particles of the
H
O
C –44.51 H 2
+14.78 Cu
K (aq) + NO3 (aq) B
means that it’s an endothermic reaction. Endothermic reactions
Na+(aq) + OH–(aq) NH4+(aq) + Cl–(aq)
H2O
Na (aq) + Cl (aq) +3.88 Au
D
sample during time interval DE?
Least L
AM
309 © UNIT 8: KINETICS AND EQUILIBRIUM