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| Sections | |||
|---|---|---|---|
| Internal Energy | 22 mins | 0 completed | Learn |
| Calorimetry | 39 mins | 0 completed | Learn |
| Thermochemical Equation | 6 mins | 0 completed | Learn Summary |
| Hess's Law | 17 mins | 0 completed | Learn |
| Enthalpy of Formation | 13 mins | 0 completed | Learn Summary |
| End of Chapter 6 Problems | 52 mins | 0 completed | Learn |
| Additional Practice |
|---|
| Units of Energy |
| Endothermic & Exothermic Reactions |
| Additional Guides |
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| Enthalpy |
Which one of the following processes is endothermic?
a. 2 H2 (g) + O2 (g) → 2 H2O (g)
b. H2O (g) → H 2O (l)
c. CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (g)
d. H2O (s) → H2O (l)
e. 2 Al (s) + Fe2O3 (s) → Al2O3 (s) + 2 Fe (s)
We’re being asked to determine which of the following processes is endothermic.
Recall that:
• 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
Analyzing process given:
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