URGENT PLEASE HELP!!
Which functional group defines a ketone?
A) −NH
B) −Na
C) =O
D) −PO4

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.

With the largest atoms and the smallest number of valence electrons and with the smallest atoms and the greatest number of valence electrons are the most reactive. a. nonmetals; metals b. nonmetals; transition elements c. transition elements; metals d. metals; nonmetals

What is the chemical name of the compound ti2o3? use the list of polyatomic ions and the periodic table to you answer.