Chapter 17 Vocab Flashcards Preview

Chemistry Chapters 16-20 > Chapter 17 Vocab > Flashcards

Flashcards in Chapter 17 Vocab Deck (24):
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Thermochemistry

The study of energy changes that occur during chemical reactions and changes in state

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Chemical potential energy

The energy stored in the chemical bonds of a substance

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Heat

Represented by q, is the energy that transfers from one object to another because of a temperature difference between them

3

System

The part of the universe on which you focus your attention

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Surroundings

Include everything else in the universe

5

Law of conservation of energy

States that in any chemical or physical process, energy is neither created nor destroyed

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Endothermic process

A system that absorbs heat from it's surroundings

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Ectothermic process

A system that releases heat to it's surroundings

8

Heat capacity

The amount of heat needed to increase the temperature of and object exactly 1degree C

9

Specific heat

The amount of heat it takes to raise the temperature 1g of the substance 1 degree C

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What is the equation to find specific heat?

Heat(joules or calories)/ mass(g) X change in temperature(degreesC)

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Calorimetry

The precise measurement of heat flow into or out of a system for chemical and physical processes

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Calorimeter

The insulated device used to measure the absorption or release of heat in chemical or physical processes

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Enthalpy(H)

The heat content of a system at constant pressure is the same as this

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Thermochemical equation

A chemical equation that includes the enthalpy change

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Heat of reaction

The enthalpy change for the chemical equation exactly as it is written

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Heat of combustion

The heat of reaction for the complete burning of one mole of a substance

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Molar heat fusion

The heat absorbed by one mole of a solid substance as it melts to a liquid at a constant temperature

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Molar heat solidification

The heat lost when 1 mole of a liquid solidifies at a constant temperature

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Molar heat vaporization

The amount of heat necessary to vaporize one mole of a given liquid

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Molar heat condensation

The amount of heat released when 1 mole of vapor condenses at the normal boiling point

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Molar heat solution

The enthalpy change caused by dissolution of one mole of substance

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Hess's law of heat summation

States that you add two or more thermochemical equations to give a final equation, then you can also add the heats of reaction to give the final heat of reaction

23

Standard heat of formation

The change in enthalpy that accompanies the formation of one mole of a compound from it's elements with all substances in their standard states at 25 degreesC