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EXERCISES 1. If you do I J of work by pulling on a rubber band, by what amount does the internal energy of the rubber band change? Write your answer with a positive or negative sign as appropriate.

EXERCISES 1. If you do I J of work by pulling on a rubber band, by what amount does the internal energy of the rubber band change? Write your answer with a positive or negative sign as appropriate.

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter4: Energy And Chemical Reactions
Section4.7: Where Does The Energy Come From?
Problem 4.13CE
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94 EXERCISES 1. If you do 1 J of work by pulling on a rubber band, by what amount does the internal energy of the rubber band change? Write your answer with a positive or negative sign as appropriate. 2. If your hot coffee loses 50 kJ of energy in cooling, what is the change in enthalpy of the coffee? Provide both the sign and the magnitude of ΔΗ. 3. Under what condition will the changes in enthalpy and internal energy be identical? 4. Identify each of the following as endothermic or exothermic. Explain. a) steam condensing b) ice melting to vyrous lemoni ni agnaro sa ai sguel wol ( c) two atoms combine to form a molecule: 2Cl(g) →→→ Cl₂(g) swans zgladino ni agnado si nadi vallangrognal d) an electron is removed from an atom: Na(g) →→→ Na*(g) + e¯
Transcribed Image Text:94 EXERCISES 1. If you do 1 J of work by pulling on a rubber band, by what amount does the internal energy of the rubber band change? Write your answer with a positive or negative sign as appropriate. 2. If your hot coffee loses 50 kJ of energy in cooling, what is the change in enthalpy of the coffee? Provide both the sign and the magnitude of ΔΗ. 3. Under what condition will the changes in enthalpy and internal energy be identical? 4. Identify each of the following as endothermic or exothermic. Explain. a) steam condensing b) ice melting to vyrous lemoni ni agnaro sa ai sguel wol ( c) two atoms combine to form a molecule: 2Cl(g) →→→ Cl₂(g) swans zgladino ni agnado si nadi vallangrognal d) an electron is removed from an atom: Na(g) →→→ Na*(g) + e¯
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