Ice melts to form water. and water freezes to form ice. choose the true statement about these changes. select one: a. both melting and freezing are physical changes. b. both melting and freezing are chemical changes. c. melting is a chemical change while freezing is a physical change. d. melting is a physical change while freezing is a chemical change.

Wave functions describe orbitals in a hydrogen atom. each function is characterized by 3 quantum numbers: n, l, and ml. if the value of n = 2: the quantum number l can have values from to . the total number of orbitals possible at the n = 2 energy level is .

Match each scenario to the form of energy it represents

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels.the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause,directly and indirectly, for such a rise in sea level is