Chapter 7.1

Question 1

What is the system

Answer 1

• it is the matter that is being observed

- >the total amount of reactants and products in a chemical reaction

Question 2

What is the environment

Answer 2

-it is everything outside the system

Question 3

Describe isolated system, closed system and open system

Answer 3

Isolated

• > system cannot exchange energy(heat and work)
• > or matter with the surroundings

Closed

• > the system can exchange energy(heat and work)
• > but not matter

Open
->the system can exchange both energy(heat and work) and matter with the surroundings

Question 4

What is a process in terms of the system

Answer 4

• when a system experiences change in one or more of its properties
• > it undergoes a process

Question 5

What are isothermic processes? What does this indicate about the equation regarding the first law of thermodynamics

Answer 5

• system’s temperature is constant
• > constant temperature implies that the total internal energy of the system is constant
• > this is because internal energy and temperature are directly proportional

-therefore, change in internal energy(U) is zero and at this point Q=W

Question 6

What are adiabatic processes? What does this indicate about the equation regarding the first law of thermodynamics?

Answer 6

• no heat is exchanged between the system and the surroundings
• > thus the thermal energy of the system is constant throughout the process
• > therefore, Q=0
• > the first law simplifies to change in U= -W

Question 7

Do isobaric processes alter the equation for the first law of thermodynamics

Answer 7

-no it doesn’t alter the first law of thermodynamics