The following diagrams illustrate the flow of energy (q) and work (w) in differe

Question

The following diagrams illustrate the flow of energy (q) and work (w) in different processess. Which one is definitly an exothermic process? Which one of the following statements is not connect? When dry ice sublimes to form CO.Of). the internal energy of the surroundings decreases. In any physical process, such as dew forming on grass or carbon dioxide subliming, the internal energy of the system does not change. When dew forms on grass overnight, the energy of the water molecules decreases. W hen dew forms on grass os cmight. the energy of the surroundings (grass, air. etc.) increases. When dry ice sublimes to form CCMjr). the energy of the carbon dioxide increases. What is the change in internal energy (deltaE) when a system is heated with 35 J of energy while it does 15 J of work? + 50 J -50 J +20 J +35 K -20 J How much work docs a gas do when il expands against a constant pressure of 0.500 atm from a volume of 50.00 mL to a volume of 350.00 mL?(!01.3 J 1 L atm) 15.2 J -15-2 J 0.150 J -0.152 J A poI0J >10j 0 +10 J

Explanation / Answer

26 ) answer : C

reason : in the process heat coming out from the system so . it is definately exothermic process . remaining all endo thermic , in those heat entering into the system

27) answer : b

28) answer : b) + 20 kJ

calculation:

dQ = dE + dW

35 = dE + 15

dE = 20 kJ

29) answer : a ) 15.2 J

calcualtion:

P = 0.5 atm

V1 = 50ml = 0.05 L

V2 = 350 ml = 0.350L

work =   P(V2-V1)

            = 0.5 (0.350 -0.05)

           = 0.15 L-atm

          = 0.15 x 101.3 J

          = 15.195 J

30 ) answer : c ) +10 J

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