Can we decide whether change in internal energy of a system is due to heating or performance of work?

The internal energy of a system can be changed by

Calculate the changes in internal energy of a system if, 300 J of heat energy is added to the system and a work of 160 J is done on the system.

Calculate the changes in internal energy of a system if, 300 J of heat energy is added to the system and a work of 160 J is done on the system.

______is the change in internal energy of a system if on giving 40 J of heat of the system, the work done on the system is 8 J.

The work done by a system is 8 J, when 40 J heat is supplied to it. The change in internal energy of the system during the process:

What is the change in internal energy if 10 J of heat is given to system at constant pressure and 20 J of work is done by the system?

What is the change in internal energy if 10 J of heat is given to system at constant pressure and 20 J of work is done by the system?

The temperature of a gas is increasing, hence its internal energy also increases. Just be observing initial and final states, can we determine whether the internal energy increment was due to work or by heat transfer.

Find the change in internal energy (in joule) of a gas when it absorbs 40 calories of heat and performs work equal to 16 J .

Find the change in internal energy if heat supplied to the gaseous system is 100 J and work done by the system is 80 J.