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25 Cards in this Set
- Front
- Back
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What is heat described as?
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The flow of internal thermal energy from high to low temperatures
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Temperature is described as the ______ of hotness
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degree
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Heat is described as the ________ of hotness
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quantity
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Temperature is represented by q measured in _________
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joules (J)
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Temperature is avg. ______ ______
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molecular motion
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Heat is the ______ of the system
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energy
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______ as stay constant as ______ increases
ex. during a phase change |
temperature can stay constant as heat increases
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Thermochem define?
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the study of heat's changes that occur during chemical reactions
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Energy define?
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the capacity for doing work or suplying heat
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Heat q
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it cannot be measured by itself, but its changes caused by heat can be detected
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System define?
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Part of the universe you focus your attention
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Surroundings define?
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everything else in the universe
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Molecules go faster and expand when _____ increases and _____ increases
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Molecules go faster and expand when the degree of hotness and the temperature increases
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The expansion of molecules can be used how in relation to temperature?
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They expansions can be used to measure temperature
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What are the two types of reactions?
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Exothermic, Endothermic
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In endothermic reactions the temperature of the system _____.
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decreases
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In exothermic reactions the temperature of the system _____.
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increases
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In exothermic reactions heat is a _____.
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product
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In endothermic reactions heat is a _____.
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reactant
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In endothermic reactions heat is _____.
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absorbed
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In exothermic reactions heat is _____.
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released
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1 Calorie = 1 kilocalorie =
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1000 calories
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Specific Heat define?
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The amount of heat it takes to raise one gram of a substance one degree oC
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Symbol
q C m change(T) |
Variable
heat specific heat mass change in temperature |
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Formula for determining heat needed?
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C=q/(m(change)T
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