2 A student puts a certain solid into a container. He comes back the next day and looks at the container. Which of the following would most likely be a sign that a chemical change has occurred in the container? OA. The solid has become a different shape. OB. The solid has become completely liquid OC. The solid has become a different size. OD. The solid has become a different color, Reset Submit​

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved

Solid tin exists in two forms: white and gray. for the transformation sn(s, white) → sn(s, gray) the enthalpy change is -2.1 kj/mol and the entropy change is -7.4 j/(mol*k). a. calculate the gibbs free energy change for the conversion of 1.00 mol white tin to gray tin at -30℃. b. will white tin convert spontaneously to gray tin at -30℃? c. at what temperature are white and gray tin thermodynamically equivalent at a pressure of 1 atm?