1. Your Quarter Grade Depends On It Read the following sentence and then answer the T/F questions: “Copper sulfate is a compound made of the elements copper, sulfur and oxygen.” Copper is made of one kind of atom: Copper sulfate is made from three elements: Copper is a compound: Copper sulfate is a compound: T / F

2. Your Quarter Grade Depends On It What does the following sentence mean? “You must read this question & TRY to answer.” The question is optional. I can leave the answer blank if I feel like it. Dr. V won’t notice if I leave the question blank. I must read the question, but don’t have to give an answer. I must read and try to answer the question. A. B. C. D. E.

3. Suffering Sulfate Copper sulfate (compound) is blue & crystalline, copper (element) is orange- brown & metallic. Chromium sulfide (compound) is dull & black, chromium (element) is shiny & silver Start with: Cu 2+ (aq) + Fe (s) End with:Cu (s) + Fe (aq) Cu 2+ (aq) + Fe (s)  Cu (s) + Fe 2+ (aq)

4. What’s wrong with this picture? What elements were used in this lab? Copper, sulfur, oxygen What compounds were used in this lab? Copper, sulfur, oxygen OFF

5. Describe differences in the properties of chromium sulfate (compound) and metallic chromium (element) ? “The chromium sulfate is a black, spray-paint looking color and it forms from dipping chrome in copper sulfate, while metallic chromium is a shiny metal and looks bright gray.” Thanks JW! “Chromium sulfate is a compound and chromium is an element.” Well … duh! Pick the answer that’s actually an answer: