How many ecosystem types are there? a) 7 b) 5 c) 2 d) 4

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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.