10-3 Entropy & Enthalpy

Based on Table I, which equation represents a reaction with the greatest difference between the potential energy of the products and the potential energy of the reactants?

• 4Al(s) + 3O₂(g) → 2Al₂O₃(s)

• 2H₂(g) + O₂(g) → 2H₂O(l)

• C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l)

• C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(l)

Tags

NGSS.HS-PS1-4

Based on Table I, which compound dissolves in water by an exothermic process?

• NaCl

• NaOH

• NH₄Cl

• NH₄NO₃

Tags

NGSS.HS-PS1-4

Based on Table I, what is the ΔH value for the production of 1.00 mole of NO₂(g) from its elements at 101.3 kPa and 298 K?

• +33.2 kJ

• -33.2 kJ

• +132.8 kJ

• -132.8 kJ

Tags

NGSS.HS-PS1-4

At 101.3 kPa and 298 K, a 1.0-mole sample of which compound absorbs the greatest amount of heat as the entire sample dissolves in water?

• LiBr

• NaCl

• NaOH

• NH₄Cl

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Given the balanced equation representing a reaction occurring at 101.3 kilopascals and 298 K:

2H₂(g) + O₂(g) → 2H₂O(l) + energy.

What is the net amount of energy released when one mole of H₂O(l) is produced?

• 241.8 kJ

• 285.8 kJ

• 483.6 kJ

• 571.6 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

According to Table I, which equation represents a change resulting in the greatest quantity of energy released?

• 2C(s) + 3H₂(g) → C₂H₆(g)

• 2C(s) + 2H₂(g) → C₂H₄(g)

• N₂(g) + 3H₂(g) → 2NH₃(g)

• N₂(g) + O₂(g) → 2NO(g)

Tags

NGSS.HS-PS1-4

Given the potential energy diagram and equation representing the reaction between substances A and D:

According to Table I, substance G could be

• HI(g)

• H₂O(g)

• CO₂(g)

• C₂H₆(g)

Tags

NGSS.HS-PS1-4

For which compound is the process of dissolving in water exothermic?

• NaCl

• NaOH

• NH₄Cl

• NH₄NO₃

Tags

NGSS.HS-PS1-4

Which equation represents an exothermic reaction at 298 K?

• N₂(g) + O₂(g) → 2NO(g)

• C(s) + O₂(g) → CO₂(g)

• KNO₃(s) → K⁺(aq) + NO₃^-(aq)

• NH₄Cl(s) → NH₄⁺(aq) + Cl^-(aq)

Tags

NGSS.HS-PS1-4

According to Table I, which potential energy diagram best represents the reaction that forms H₂O(l) from its elements?

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Tags

NGSS.HS-PS1-4