In the following description of the element fluorine, identify which of the properties are chemical and which are physical. “Fluorine is a pale-yellow corrosive gas that reacts with practically all substances. Finely divided metals, glass, ceramics, carbon, and even water burn in fluorine with a bright flame. Small amounts of compounds of this element in drinking water and toothpaste prevent dental cavities. The free element has a melting point of -219.6 °C and boils at -188.1 °C. Fluorine is one of the few elements that forms compounds with the element xenon.”