Question

Classify each of the following thermodynamic systems as “open”, “closed”, or “isolated”. For “open” or “closed”, specify how matter or energy can be transferred between the system and surroundings.

(a) Root beer in an unopened can

(b) Root beer in an open can

(c) A LED lamp (off)

(d) A LED lamp (lit by an external electrical circuit)

(e) A frog.

(f) Ice, liquid water, water vapor, and air in a sealed, perfectly insulated thermos bottle

(g) The Sun.

Answer 1

Open System : which can exchange both matter and Energy with surroundings

Closed System : which can exchange only Energy but not matter with surroundings

Isolated System : which cannot exchange Energy and matter with surroundings

a)

Root beer in an unopened can is a closed system.

since there no exchange of matter but energy can be tranfered with surroundings

b)

Root beer in an open can is an open system

Since both matter and energy can be exchanged with surroundings.

C)

A LED lamp (off) is an isolated system.

Since there is no transference of matter and energy with surroundings.

d)

A LED lamp (lit by an external electrical circuit) is a closed system.

since there is exchange of enrgy but not matter with surroundings.

e)

A frog is an open system.

Since the food and it's waste of matter and energy exchange with surroundings.

f)

Ice, liquid water, water vapor, and air in a sealed, perfectly insulated thermos bottle is an isolated system

Perfectly insulation means there is no exchange of matter and energy with surroundings.

g)

The Sun is open system

Since radiation energy and gases present in the sun are exchanged between system and surroundings.