when is w=0 and when is q=0?

[Lisa Werner 2F]

when is w=0 and when is q=0? what are the key words that indicate these two conditions?

[Chem_Mod]

Work is 0 when there is no change in volume (isochoric). Heat is 0 for an adiabatic process, which will usually be explicitly stated.

[Petrina Kan 2I]

What is an adiabatic process?

[Eesha Sohail 1D]

In an adiabatic process, heat does not enter or leave the system. Energy transfer happens only through work, so Q=0.

[Sofia Barker 2C]

Here's an image from Khan Academy that answers your question and explains the signs of W, Q, and delta U.

[Christineg1G]

W=0 when the volume of the work done on a gas is constant. Q=0 when there is no heat exchanged (happens if the container is thermally insulated).

[kristi le 2F]

Also, if w = 0, the internal energy of the system is determined only by q. If q = 0, the internal energy of the system is determined only by w.