Please provide reasoning for each situation. For each of the situations describe

Question

Please provide reasoning for each situation.

For each of the situations described below, the object considered is undergoing some changes. Among the possible changes, you should consider are: The object is absorbing or giving off heat. The object's temperature is changing. The object's internal energy is changing. The object is doing mechanical work or having work done on it. The objects chemical energy is changing. For each of the situations described below, identify which of the four changes are taking place and write as many of the letters Q T U WC (or none) as are appropriate. 1. A cylinder with a piston on top contains a compressed gas and is sitting on a thermal reservoir (a large iron block). After everything has come to thermal equilibrium, the piston is moved upward somewhat (very slowly). The object to be considered is the gas in the cylinder. Q T U W C Consider the same cylinder as in part 1, but it is wrapped in Styrofoam, a very good thermal insulator instead of sitting on a heat reservoir. The piston is pressed downward (again, very slowly), compressing the gas. The object to be considered is the gas in the cylinder. Q T U W C An ice cube sitting in the open air Is melting. Q T U W C A mixture of two moles of hydrogen gas and one mole of oxygen gas in a thermally insulated vessel Is subjected to small spark (contributing negligible energy) and converts to water vapor. Q T U W C

Explanation / Answer

1) OBJECT by absorbing heat , the volume of cylinder increases at the same time the heat energy is absorbed by the object

resulting temperature changes ---> internal energy also changes

so the answer is Q ,T ,U, W but not C

2) cylinder inside styrofoam so that there is no exchange of heat from the hear reservoir then

   as the pistion moves downward slowly the volume decreases then the temperature slighly changes

  
so options are T,U,W

but not Q,C

3) as ice cube at 0 0C , in air melting

   temperature increases , heat absorbed, internal energy changes

so options are Q,T,U , but not W,C

4) options are

   only option is C only

but not Q,T,U,W

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.