## Significance of open, closed, isolated

Jessa Maheras 4F
Posts: 121
Joined: Fri Aug 02, 2019 12:16 am

### Significance of open, closed, isolated

I understand the difference between open, closed and isolated systems, but what is the significance of recognizing and understanding what type of system a reaction is when answering problems and doing calculations? Does the type of system affect what must stay constant in a reaction? What information does knowing the type of system give us?

Rida Ismail 2E
Posts: 139
Joined: Sat Sep 07, 2019 12:16 am

### Re: Significance of open, closed, isolated

Well it is very important to know because you want to see what is naturally exchanged. In open both matter and energy is exchanged. In closed just energy is exchanged. And in isolated nothing is. The type of system definitely affects what stays constant.

Megan Kirschner
Posts: 46
Joined: Wed Feb 20, 2019 12:17 am

### Re: Significance of open, closed, isolated

Exactly- it helps you determine which variables are constant in an equation (and can thus be substituted for 0s).

Jialun Chen 4F
Posts: 108
Joined: Sat Sep 07, 2019 12:16 am

### Re: Significance of open, closed, isolated

For a closed system, heat can be exchanged but volume remains constant. An open system has constant pressure yet a changing volume. An isolated system has no energy exchange whatsoever (eg. bomb calorimeter).

Jocelyn Thorp 1A
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am

### Re: Significance of open, closed, isolated

Jialun Chen 4F wrote:For a closed system, heat can be exchanged but volume remains constant. An open system has constant pressure yet a changing volume. An isolated system has no energy exchange whatsoever (eg. bomb calorimeter).

exactly this! This information can be used to help solve problems. For example, for open systems, since pressure is constant (isobaric conditions), enthalpy is equal to the heat transferred (making the calculation much simpler).

Maika Ngoie 1B
Posts: 97
Joined: Fri Aug 02, 2019 12:16 am

### Re: Significance of open, closed, isolated

It's important to spot the difference because it'll help better understand the relationship between the system and surroundings and to understand the corresponding variables for each system (i.e. open system=constant pressure, among others)

Ruby Richter 2L
Posts: 103
Joined: Thu Jul 25, 2019 12:17 am

### Re: Significance of open, closed, isolated

So since the pressure is constant in an open system does that mean it is not constant in closed and isolated systems?

Jessa Maheras 4F
Posts: 121
Joined: Fri Aug 02, 2019 12:16 am

### Re: Significance of open, closed, isolated

Jialun Chen 4F wrote:For a closed system, heat can be exchanged but volume remains constant. An open system has constant pressure yet a changing volume. An isolated system has no energy exchange whatsoever (eg. bomb calorimeter).

So, in an isolated system, if it has no exchange of energy, can work be done? What would the value of q be? Would q=0?

Jialun Chen 4F
Posts: 108
Joined: Sat Sep 07, 2019 12:16 am

### Re: Significance of open, closed, isolated

Jessa Maheras 4F wrote:
Jialun Chen 4F wrote:For a closed system, heat can be exchanged but volume remains constant. An open system has constant pressure yet a changing volume. An isolated system has no energy exchange whatsoever (eg. bomb calorimeter).

So, in an isolated system, if it has no exchange of energy, can work be done? What would the value of q be? Would q=0?

Correct! q would be zero since the deltaU (internal energy) is zero, which we can also deduce that w=0.

Kishan Shah 2G
Posts: 132
Joined: Thu Jul 11, 2019 12:15 am

### Re: Significance of open, closed, isolated

In my opinon. The most applicable scenario in which we would use our knowledge about closed, isolated, and open systems in when assessing whether there are changes in heat and work. For example since a bomb calorimeter is an isolated system there is no work done on the system.

Lizette Noriega 1H
Posts: 105
Joined: Wed Sep 18, 2019 12:15 am

### Re: Significance of open, closed, isolated

The status of the system helps you recognize the presence/absence of exchange in energy and matter, thus allowing you to understand the relationship between the system and its surroundings (and helps you solve the problems given).

Jessa Maheras 4F
Posts: 121
Joined: Fri Aug 02, 2019 12:16 am

### Re: Significance of open, closed, isolated

Jialun Chen 4F wrote:
Jessa Maheras 4F wrote:
Jialun Chen 4F wrote:For a closed system, heat can be exchanged but volume remains constant. An open system has constant pressure yet a changing volume. An isolated system has no energy exchange whatsoever (eg. bomb calorimeter).

So, in an isolated system, if it has no exchange of energy, can work be done? What would the value of q be? Would q=0?

Correct! q would be zero since the deltaU (internal energy) is zero, which we can also deduce that w=0.

Alright great Julia Thank you!