Classify each of the following as endothermic reaction or exothermic reaction: E
ID: 904791 • Letter: C
Question
Classify each of the following as endothermic reaction or exothermic reaction: Endothermic or exothermic reaction
a. CH4(g) + 2 O2(g) CO2(g) + 2H2O(g) + 890 kJ
b. Ca(OH)2(s) + 65.3 kJ CaO(s) + H2O(l)
c. 2 Al(s) + Fe2O3(s) Al2O3(s) + 2 Fe(s) + 850 kJ
How would each of the following change the rate of the chemical reaction shown in the equation below. Will the rate of reaction increase or decrease?
2 SO2(g) + O2(g) à 2SO3(g)
d. adding SO2(g)
e Increasing the temperature
f. adding a catalyst
g. removing some O2
The following reaction is endothermic:
CaCO3(s) <----> CaO(s) + CO2(g)
h. What is the effect of increasing the temperature of the reaction mixture?
i. Decreasing the temperature?
j. What is the effect of adding CO2to the reaction mixture?
Explanation / Answer
a. CH4(g) + 2 O2(g) -------------> CO2(g) + 2H2O(g) + 890 kJ (Exothermic)
b. Ca(OH)2(s) + 65.3 kJ .--------------> CaO(s) + H2O(l) (Endoothermic)
c. 2 Al(s) + Fe2O3(s) ---------------> Al2O3(s) + 2 Fe(s) + 850 kJ (Exothermic)
2 SO2(g) + O2(g) -----------------> 2SO3(g)
d. adding SO2(g) rate will increase
e Increasing the temperature : rate will increase
f. adding a catalyst : rate will increase
g. removing some O2 : rate will decrease
CaCO3(s) <----> CaO(s) + CO2(g)
h. What is the effect of increasing the temperature of the reaction mixture?
ans: on increasing the temperature of this reaction equilibrium shifts to the product side that means reactant decomposition increases
i. Decreasing the temperature?
ans: Decreasing the temperature reaction shifts to the reactant side
j. What is the effect of adding CO2 to the reaction mixture?
ans: reaction shifts to the reactant side addition of any product leads to shifts the equilibrium towards reactant side