PDF Notes: Chem chp 8

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    What happens when steam reacts with hot coal?

    Carbon monoxide and hydrogen are produced.

    What is water gas?

    A mixture of carbon monoxide and hydrogen used as fuel.

    How much heat is absorbed per mole of carbon in the water gas reaction?

    131 kJ of heat is absorbed.

    What is the overall reaction when burning coal?

    Produces carbon dioxide and releases 393 kJ of heat.

    What is the difference in heat release between burning coal and water gas?

    Water gas releases more heat due to prior heat absorption.

    What does a positive ΔH indicate?

    The reaction absorbs energy and is endothermic.

    What does a negative ΔH indicate?

    The reaction releases energy and is exothermic.

    What is Hess's Law?

    The heat of a reaction depends only on initial and final states.

    What is calorimetry?

    The measurement of heat produced in a chemical reaction.

    What is the purpose of a calorimeter?

    To measure the heat evolved during a combustion reaction.

    How does a constant volume calorimeter differ from an open system?

    No expansion work is done in a constant volume calorimeter.

    What happens when steam reacts with hot coal?

    Carbon monoxide and hydrogen are produced.

    What is water gas?

    A mixture of carbon monoxide and hydrogen used as fuel.

    How much heat is absorbed per mole of carbon in the water gas reaction?

    131 kJ of heat is absorbed.

    What is the overall reaction when burning coal?

    Produces carbon dioxide and releases 393 kJ of heat.

    What is the difference in heat release between burning coal and water gas?

    Water gas releases more heat due to prior heat absorption.

    What does a positive ΔH indicate?

    The reaction absorbs energy and is endothermic.

    What does a negative ΔH indicate?

    The reaction releases energy and is exothermic.

    What is Hess's Law?

    The heat of a reaction depends only on initial and final states.

    What is calorimetry?

    The measurement of heat produced in a chemical reaction.

    How does a constant volume calorimeter differ from an open system?

    No expansion work is done in a constant volume calorimeter.

    What happens when steam reacts with hot coal at 600°C?

    Carbon monoxide and hydrogen are produced.

    What is the heat absorbed per mole of carbon in the water gas reaction?

    131 kJ of heat is absorbed.

    How does the heat released from burning water gas compare to burning coal directly?

    Water gas releases more heat due to prior heat absorption.

    What is the overall reaction when coal is burned?

    Carbon dioxide is formed with 393 kJ of heat released.

    What does a positive ΔH indicate about a reaction?

    The reaction absorbs energy and is endothermic.

    What does a negative ΔH indicate about a reaction?

    The reaction releases energy and is exothermic.

    What is Hess's Law?

    The heat of a reaction depends only on initial and final states.

    What is calorimetry?

    The measurement of heat produced in a chemical reaction.

    How is the heat of combustion calculated in a calorimeter?

    By measuring the temperature change of water.

    What is the difference between constant volume and constant pressure calorimetry?

    Constant volume does not account for expansion against atmospheric pressure.