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https//session.masteringchemistry.com/myct/mastering /assignment/list/5775369 Mastering/Chemistry Post Lecture Assignment Chapter 06-Google Chrome Secure https/ ngchemistry.com/myct/itemView?offset tProblemID-90439391 Chapter Exercise 639 Part A xercise 6.39 Identily energy exchanges as primarily heat or work Drag the items into the appropriate bins. Identify each of the following energy exchanges as sign of Eis positive or negative for the system a Sweat evaporales from skin, cooling the skin Reset Hel (The evaporating sweat is the system) b A balloon expands against an external peessure (The contents of the baloon is the system.) c. An aqueous chemical reaction mture is warmed with an extemal flame. (The reaction mixture is the system) heat work e to search

Explanation / Answer

6.39)

part A:

a) Answer: heat

Since heat is being lost from system

b) Answer: work

This is expansion and hence system i doing work on surrounding

c) Answer: heat

Since heat is being absorbed by the system

part B:

a) Answer: negative

since it is being lost, it will make delta E negative

b)Answer: negative

Since work is being done by system, it will make delta E negative

c) Answer: positive

since it is being absorbed, it will make delta E positive

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