First law of thermodynamics is founded on the law of definite proportion.

The validity of the first law is tested by measuring the change in the

internal energy of a system between its initial state and its final

state in a process.

Because energy can be changed from one form to another, the

energy lost by one system can not be gained by another system in a different form.

The internal energy of a system is the difference of heat exchange

and the work done.

The symbol for heat exchange is Q.

The sign convention for work done w by the system to the

surrounding is positive.

The sign convention for heat absorbed from the surroundings is

negative.

When gas expand, the work is done by the surrounding to the system.

When gas is compressed, the work is done by the system to the

surroundings.

During _______________, heat is absorbed by the system from the surrounding.

The release of energy in the form of heat during exothermic process leads to______________.

What do you call to the transfer of thermal energy between two bodies that are at different temperatures?

The study of heat change in chemical reactions such as during the formation of carbon sulfide from carbon and sulfur.

The specific part of the universe that is of interest to us. It usually

includes substances involved in chemical and physical changes.

The type of system that can exchange energy which is usually in the form of heat with its surroundings.

The type of system that can exchange mass and energy, usually in the form of heat with its surroundings.

This refer to the rest of the universe outside the system.

Which of the following is a state function?

When heat is absorbed by the surrounding from the system , the sign convention for work is_________________