• Exothermic reactions
▪ lose energy, releases heat, temperature of the surroundings increases
▪ involves bond formation (for phase change: gas → liquid → solid)
▪ ΔH is negative
• Endothermic reactions
▪ gain/requires energy, absorbs heat, temperature of the surroundings decreases
▪ involves breaking bonds (for phase change: solid → liquid → gas)
▪ ΔH is positive
Van't Hoff Equation:
Nickel metal can be prepared by the reduction of nickel oxide:
NiO(s)+CO(g) → CO2(g)+Ni(s)
At 936, Kp = 4.54 x 103 and at 1125 K, Kp = 1.58 x103.
Which statement is true?
a. The reaction is endothermic.
b. The activation energy decreases with increasing temperature.
c. The reaction is exothermic.
d. The activation energy increases with increasing temperature.
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