Classify each change as physical or chemical. a. sugar burns when heated in a skillet b. sugar dissolves in water c. a platinum ring becomes dull because of continued abrasion d. a silver surface becomes tarnished after exposure to air for a long period of time

Essay-alternative energy sources research sources of energy that are being developed. write a report of 350-400 words discussing the information you learned concerning the development of various energy sources and the impact that you think they will have on your life. include sources cited at the end of your report using the mla format. follow the rubric guidelines. note that wikipedia is not an appropriate resource for a research paper. worth 99