Presentation on theme: "Thermochemistry AP Chemisattempt. thermodynamics: the research of power and its revolutions -- thermochemistry: the subdiscipline including chemical reactions."— Presentation transcript:




You are watching: What term is defined as the study of energy and its transformations

1 Thermochemisattempt AP Chemisattempt

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2 thermodynamics: the research of power and also its revolutions -- thermochemistry: the subself-control including chemical reactions and energy alters

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3 temperature. Energy kinetic energy: power of motion; KE = ½ mv 2 -- all pposts have KE -- Thermal power is due to the KE of pposts. We meacertain the average KE of a repertoire of pwrite-ups as... potential energy: stored power Chemical potential energy is because of electrostatic forces in between charged particles. -- regarded the certain plan of atoms in the substance ++

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4 Units of power are joules (J), kilojoules (kJ), calories (cal), or nutritional calories (Cal or kcal). -- conversions: James Prescott Joule (1818-1889) SI unit 4184 J = 4.184 kJ = 1000 cal = 1 Cal = 1 kcal

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5 system: the part of the world we are studying surroundings: everything else -- In chemistry, a closed device can exadjust energy but not issue with its surroundings. -- Usually, energy is transferred to... …(1)...or...(2) readjust an object’s state of activity cause a temperature adjust

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6 Work (w) is done when a pressure moves via a distance. W = F d Heat (q) is an amount of energy moved from a hotter object to a cooler one.

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7 Find the kinetic power of a solitary dinitrogen monoxide molecule moving at 650 m/s. N2ON2O (laughing gas) KE = ½ mv 2 m = 44 amu = 7.31 x 10 –26 kg KE = ½ (7.31 x 10 –26 kg) (650 m/s) 2 = 1.5 x 10 –20 J ?

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8 First Law of Thermodynamics Law of Conservation of Energy = -- Energy morphs in between its various creates, however the full amount remains the very same. (pretty much)

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inner energy (E) of a system: the sum of all the KE and PE of the components of a mechanism -- The adjust in the inner power of a system would be discovered by:  E = E final – E initial And for chemistry, this equation would become:  E = E assets – E reactants  E is + if E last E initial (i.e., device..." > 9 > inner energy (E) of a system: the amount of all the KE and also PE of the components of a mechanism -- The adjust in the inner energy of a device would be discovered by:  E = E final – E initial And for chemisattempt, this equation would certainly become:  E = E assets – E reactants  E is + if E final E initial (i.e., system... )  E is – if E last E initial (i.e., mechanism... )

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inner energy (E) of a system: the sum of all the KE and also PE of the components of a device -- The change in the inner power of a device would be found by:  E = E last – E initial And for chemistry, this equation would certainly become:  E = E commodities – E reactants  E is + if E final E initial (i.e., device..." title=")  E is – if E last E initial (i.e., system... )

10 But we ARE able to find  E by measuring two forms of “energy” quantities:  E = q + w q = heat: +/– q = mechanism absorbs/releases heat w = work: +/– w = occupational done on/by device ** KEY: Sign conventions are based upon the system’s allude of view. The Titanic was driven by enormous steam engines. The internal energy of the water molecules of the vapor changed from instant to instant, relying on just how a lot warm they were taking in and how much work they were doing throughout a offered time interval.

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12 In endothermic processes, warm is _________ by the device. e.g., took in melting boiling sublimation e.g., released freezing condensation deplace In exothermic processes, heat is ________ by the device.

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13 To go even more, we must present the principle of enthalpy (H). -- Enthalpy (H) is defined as...H = E + PV whereE = system’s inner power P = push of the system V = volume of the system Heike Kamerlingh Onnes 1853–1926 The Dutch physicist and Nobel laureate H.K. Onnes coined the term enthalpy, basing it on the Greek term enthalpein, which suggests “to warm.”

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14 i.e.,  H = H final – H initial = q P P shows consistent press problems. When  H is +, the system... has obtained warmth. When  H is –, the device... has lost warm. Enthalpy is a considerable home, definition that… (ENDO) (EXO) -- There is much that could be said about enthalpy, but what you need to know is: If a process occurs at consistent press, the readjust in enthalpy of the device equals the warmth lost or got by the mechanism. the amount of product affects its worth.

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15 In the burning of firelumber at continuous pressure, the enthalpy change equals the warm released.

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 H is (–) and also counts on the quantity of timber burned.

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