Milk can sour, which means the acidity
increases and the
proteins fold. This causes
whey (watery part of
milk) and a thick mass.
What evidence suggests
a chemical change has
taken place?

Freezing 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.