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    Endothermic Exothermic Reactions

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    wama
    This document provides a worksheet on endothermic and exothermic reactions. It asks the learner to identify whether heat is gained or lost in endothermic and exothermic reactions, predict the sign of the enthalpy change (ΔH) in these reactions, give examples of each type of reaction, and write thermochemical equations for specific reactions including the combustion of methane.

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    Endothermic Exothermic Reactions

    Uploaded by

    wama
    525 views1 page
    This document provides a worksheet on endothermic and exothermic reactions. It asks the learner to identify whether heat is gained or lost in endothermic and exothermic reactions, predict the sign of the enthalpy change (ΔH) in these reactions, give examples of each type of reaction, and write thermochemical equations for specific reactions including the combustion of methane.

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    This document provides a worksheet on endothermic and exothermic reactions. It asks the learner to identify whether heat is gained or lost in endothermic and exothermic reactions, predict the sign of the enthalpy change (ΔH) in these reactions, give examples of each type of reaction, and write thermochemical equations for specific reactions including the combustion of methane.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    525 views1 page

    Endothermic Exothermic Reactions

    Uploaded by

    wama
    This document provides a worksheet on endothermic and exothermic reactions. It asks the learner to identify whether heat is gained or lost in endothermic and exothermic reactions, predict the sign of the enthalpy change (ΔH) in these reactions, give examples of each type of reaction, and write thermochemical equations for specific reactions including the combustion of methane.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 1

    Worksheet: Endothermic and exothermic reactions and thermochemical equations

    1. In an exothermic reaction, is heat gained or lost in the system? Draw a diagram that shows the transfer
    of heat energy in an endothermic reaction.
    2. In an endothermic reaction, is heat gained or lost in the system? Draw a diagram to illustrate the transfer
    of energy in an exothermic reaction.
    3. Is H positive or negative in an exothermic reaction?
    4. Is H positive or negative in an endothermic reaction?
    5. Predict the sign of H for the burning of a candle. Is this reaction endothermic or exothermic?
    6. List three examples of an exothermic reaction.
    7. List two examples of an endothermic reaction.
    8. Determine the quantity of energy (heat) involved in the following reactions:
    a. When hydrogen peroxide is placed on a cut knee it decomposes to form water and oxygen gas. How
    much energy will be released when 34.0 g of H2O2 decomposes according to the following equation?
    2H2O2(l) 2H2O(l) + O2(g) + 200kJ
    b. How many kilojoules of energy will be needed to decompose 10.8 grams of N2O5 gas?
    2 N2O5 (g) + 110 kJ 4NO2(g) + O2(g)
    9. Methane (CH4) gas is used as a fuel for heating hot water in many of our homes. In addition it is the gas
    used to fuel the Bunsen burners in our lab. Write the thermochemical equation for the combustion of
    methane gas. The H for methane is 890 kJ/mol.

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