enthalpy changes and calorimetry

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12 Terms

1
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define energetics:

energy changes during chemical reactions

2
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what is an exothermic reaction? describe the diagram for an exothermic reaction

a reaction in which heat energy is given off

<p>a reaction in which heat energy is given off </p>
3
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what is an endothermic reaction? describe the diagram for an endothermic reaction

a reaction in which heat energy is taken in

<p>a reaction in which heat energy is taken in</p>
4
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what is enthalpy?

  • a measure of the heat content of a substance

  • represented by the symbol H

5
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what are the units for enthalpy?

kJ mol-1

6
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what is enthalpy change?

  • change in heat content at constant pressure

  • represented by ΔH

7
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what are standard conditions for a reaction?

  • 100 kPa

  • stated temp (usually 298K)

  • constant pressure (1 bar/100kPa)

  • represented by ΔHƟf

8
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what is the standard enthalpy change of formation of a compound? how is it represented?

  • the enthalpy change which occurs when ONE MOLE of the compound is formed from its ELEMENTS under STANDARD CONDITIONS and w/ everything in its standard state

  • represented by ΔHƟf

<ul><li><p>the enthalpy change which occurs when ONE MOLE of the compound is formed from its ELEMENTS under STANDARD CONDITIONS and w/ everything in its standard state</p></li><li><p>represented by ΔH<sup>Ɵ</sup>f</p></li></ul><p></p>
9
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what is the standard enthalpy change of combustion of a compound? how is it represented?

  • the enthalpy change which occurs when ONE MOLE of the compound is BURNED COMPLETELY in oxygen under STANDARD CONDITIONS and w/ everything in its STANDARD STATE

  • represented by ΔHƟc

<ul><li><p>the enthalpy change which occurs when ONE MOLE of the compound is BURNED COMPLETELY in oxygen under STANDARD CONDITIONS and w/ everything in its STANDARD STATE</p></li><li><p>represented by ΔH<sup>Ɵ</sup>c</p></li></ul><p></p>
10
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what is the specific heat capacity equation?

q = mcΔT

11
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what is the equation for ΔH?

ΔH = q/moles

12
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what is calorimetry?

the process of measuring the amount of heat energy released/absorbed during a chemical reaction