I did a chocolate lab. It was melting chocolate. These are the tree question please answer all. Please help me ASAP

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

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.

Adilute aqueous potassium nitrate solution is