1 Visit one of the 57 DMV Select offices in Virginia to avoid the $5 fee. 2  Refer to DMV Select Locations by District to find the DMV Select office that is closest to you. 3  Customer Service Center. 4  You will pay an additional $5 fee if you renew your vehicle registration in a customer service center (CSC).
Hypothesis: If a substance is changing phase, then the temperature of that substance should (increase, decrease, or stay the same). I think this occurs because.... Materials: Â· 500 mL beakerÂ· crushed iceÂ· thermometerÂ· hot plateÂ· stopwatch or timerÂ· test tube of lauric acid (obtained from teacher).
If you take the solid and liquid, or liquid and gas, or whatever the two phases are, then at the phase change the Gibbs free energies of the two components are the same because the two states are in equilibrium. The Gibbs free energy change in the transition is: $$ \Delta G = \Delta H - T \Delta S $$ where $\Delta H$ is the change in enthalpy and $\Delta S$ is the change in entropy. The temperature $T$ is a constant because the phase change occurs at constant temperature. At the phase change temperature $\Delta G$ is zero so: $$ \Delta H = T \Delta S $$ The enthalpy change $\Delta H$ is basically the heat emitted or absorbed during the phase change, and it's balanced by the change in entropy due to the phase change.