What diagram do we use to classify stars? What characteristic of stars is being measured on the X axis of this diagram? What is being measured by the Y axis. High Mass Stars:

Super Massive Stars (The most massive stars in the universe :
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Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

How is the atomic number of a nucleus changed by alpha decay