cava chem 303 s2d40 4.06 Enthalpy
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
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| [...] is the total thermal energy content of a system at constant pressure. | Enthalpy is the total thermal energy content of a system at constant pressure.
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| Enthalpy change is measured in terms of change in heat between the [...] and the [...]. | Enthalpy change is measured in terms of change in heat between the products and the reactants.
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| Although you cannot measure the enthalpy (H) of either system directly, you can measure the [...] in enthalpy between the two systems. | Although you cannot measure the enthalpy (H) of either system directly, you can measure the change in enthalpy between the two systems.
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| The change of enthalpy is noted with the symbol [...]. | The change of enthalpy is noted with the symbol ΔH.
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| Exothermic reacitions have a [...] ΔH because the chemicals lose energy. | Exothermic reacitions have a negative ΔH because the chemicals lose energy.
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| Endothermic reactions have a [...] ΔH because the chemicals gain energy. | Endothermic reactions have a positive ΔH because the chemicals gain energy.
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| Changes in [s-], like chemical reactions, involve changes in enthalpy. | Changes in state, like chemical reactions, involve changes in enthalpy.
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| The energy change during a state change is called "[...] heat" | The energy change during a state change is called "latent heat"
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| latent heat of fusion = heat involved in [...] or [...]. | latent heat of fusion = heat involved in melting or freezing.
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| latent heat of vaporization = heat involved in [...] or [...]. | latent heat of vaporization = heat involved in evaporating or condensing.
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