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Endothermic & Exothermic Reactions

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Additional Practice
Units of Energy

Additional Guides
Endothermic & Exothermic Reactions
Enthalpy

Guide Additional Practice Summary

Solution: 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)

Solution: 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

Problem

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)

Solution

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:

View Complete Written Solution

Endothermic & Exothermic Reactions

Solution: 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)

Solution: 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

Practice Problems

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Solution: 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)