Please complete this assignment before the next class meeting. Written answers t

Question

Please complete this assignment before the next class meeting. Written answers to questions must be handed in at the beginning of class. Read section 2.7 and 2.8 in the textbook. II. Answer the following questions. You are asked to consider the questions below in preparation to class discussion. Any questions you have about this homework assignment can be directed to me or your classmates. The answers to most of these questions will be clear after you read the section in the textbook specified in part I. For some of the questions, you will have to draw on your previous knowledge of chemistry. You are encouraged to discuss this assignment with me and your classmates. However, the answers you hand in must be your own work 1. Using the definition of kinetic energy, show that the SI unit of energy is equivalent to kg.m2.secr2. 2. In your own words, explain the difference between an intensive and an extensive property. 3. What is the change in internal energy for an isolated system? Justify your answer.

Explanation / Answer

1).

Kinetic energy can be defined mathematically as follow.

Kinetic energy = ½ mv2

Here m is the mass of object in motion and v is the velocity of it.

Si unit of mass if kg and that of the velocity is m/s

Lets assume mass of object is 1 kg and velocity is 1 m/s

Plugging these in kinetic energy formula

K.E= 1 kg x (1 m/s)2

= kg.m2s-2

Hence it is proved. That the energy in SI has unit = kg.m2s-2

2).

Intensive properties : The properties that tells about quality of substance.

This does not depends on the quantity. For example boiling point. If we measure boiling point of 1 L water or 100 L water its same so boiling point is intensive property.

In the other hand the properties which totally depends on the amount or quantity of the substance is extensive property. For example volume.

3) Isolated system :

The system neither can exchange matter or energy with surrounding.

In this system the energy is not exchanged with surrounding so the there is no change in internal energy in this particular system.

  

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