Are changes in states of matter physical or chemical changes? How can you tell?

What is the percent by mass of oxygen in fe2o3

How many moles of bromine are needed to produce 3.23 moles of potassium bromide

Most ionic compouds are crystalline solids at room temperature. true falseionic compounds are electrically neutral. true falseionic compounds generally have low melting points. true falsewhen melted, ionic compounds do not conduct electricity. true falsethe electrostatic attraction between an anion and a cation is an ionic bond. true false