The heating curve below shows the temperature change that occurs as a solid is heated. what is occurring at segment cd of the graph? (3 points) a line graph showing the heating curve of a substance being heated from the solid phase all the way to the gas phase. from left to right across the x-axis, the different regions of the heating curve are labeled with variables a through f. first, there is an incline with a positive slope labeled ab, followed by a horizontal region labeled bc. then there is another incline with a positive slope labeled cd, followed by another horizontal region labeled de. the end of the heating curve shows another incline with a positive slope labeled ef. boiling a liquid melting a solid heating a liquid heating a solid

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

Answer explain why it is not possible to deduce a complete order of reactivity.