Practice Common Types Of Standard Enthalpy Changes (1.2.2) - Unit 5: Energetics and Thermochemistry

Practice: Common Types of Standard Enthalpy Changes

Lesson 1.2.2Unit 5: Energetics and Thermochemistry

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8 questions

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6 sample questions

Question 1.
What is the definition of Standard Enthalpy of Formation?
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Think about what happens when elements combine.
Question 2.
What does it mean when ΔH_c° is negative?
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Recall that combustion is a burning process.
3Question 3.
What is the Standard Enthalpy of Formation denoted as?
- ΔH_f°
- ΔH_c°
- ΔH_rxn°
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Think about what 'f' may stand for.
4Question 4.
True or False: The Standard Enthalpy of Combustion is always endothermic.
- True
- False
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Recall what happens in a combustion reaction.
Question 5.
Calculate the Standard Enthalpy of Reaction for the following balanced equation by using known standard enthalpies of formation: C₂H₄(g) + 3 O₂(g) → 2 CO₂(g) + 2 H₂O(l), given ΔH_f° [CO₂(g)] = –393.5 kJ/mol and ΔH_f° [H₂O(l)] = –285.8 kJ/mol.
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Use the summing formula for products and reactants appropriately.
Question 6.
If the enthalpy of combustion of glucose (C₆H₁₂O₆) is –2803 kJ/mol, calculate the Standard Enthalpy of Formation for glucose knowing the formation of CO₂ and water.
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Connect the glucose combustion with its decomposition to relate to formation.

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