Blocks on the periodic table are formed by elements that have the same atomic mass. true or false

Which statement is true about ionic compounds?

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.

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