SDN Members don't see this ad. (About Ads) Hey guys I had a few questions about this equation. Does the q stand for the change in energy that must be provided (or removed) to change the temp of a substance? How would you conceptually tackle a problem that involves combining a hot substance with a cool that come together to an equilibrium temperature? 50g piece of an unknown metal at 50C is added to 50g H2O at 0C and the mixture reaches thermal equil at 10C. What is the specific heat of the metal?