Which of these is an element?

KBr
O2
2KCl
FeO2

If a || b and e || f, what is the value of y ?

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

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.