A student placed a sample of a pure metal in a crucible and heated it strongly in air. Data from the experiment are given in the table below. The final mass was determined after the sample was cooled to room temperature. Mass of empty crucible 12.0 g Mass of crucible and sample before heating 14.4 g Mass of crucible and sample after heating 16.0 g Which of the following statements related to the experiment is correct? a) The mass of the sample decreased, so physical changes occurred as the metal first melted and then boiled out of the crucible b) The mass of the sample increased, so a chemical change occurred when bonds formed between the metal and another substance c) There was nothing for the metal to react with, so only a physical change could have occurred d) The sample was only heated, so neither a physical nor a chemical change occurred