Answer to Question #203796 in General Chemistry for lea

Question #203796

Which of these changes are endothermic? Which are exothermic? (You must know the names for each of the phase changes.) please explain

a) Melting of ice

b) CH4 (g) + 2 O2 (g) --> CO2 (g) + 2 H2O (g) + 882 kJ

c) Deposition of iodine

d) NH4Cl (s) --> NH4Cl (aq) ΔH° = + 14.7 kJ/mol

e) Calcium oxide solid dissolving in water causes a temperature increase


Which of these changes are endothermic? Which are exothermic? (You must know the names for each of the phase changes.)

a) Water accumulating on grass early in the morning

b) Solidification of liquid magma

c) 3NO2 + H2O --> 2HNO3 + NO ∆H = - 138 kJ

d) 6CO2 + 6H2O + 2803 kJ --> C6H12O6 + 6O2

e) Sugar crystalizing in a saturated solution.


1
Expert's answer
2021-06-07T05:03:19-0400

Exothermic

a). Melting of ice

b). CH4 (g) + 2 O2 (g) --> CO2 (g) + 2 H2O (g) + 882 kJ

c). Calcium oxide solid dissolving in water causes a temperature increase

Endothermic

a). 6CO2 + 6H2O + 2803 kJ --> C6H12O6 + 6O2

b). Deposition of iodine

c). NH4Cl (s) --> NH4Cl (aq) ΔH° = + 14.7 kJ/mol



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