1. Which of the boxes contains only an element? Which contains only a compound? How many different types of molecules are shown altogether in all three boxes? 2. Elemental copper, Cu, is copper...

1. Which of the boxes contains only an element? Which contains only a compound? How many different types of molecules are shown altogether in all three boxes?

2. Elemental copper, Cu, is copper colored. Elemental sulfur,
, is yellow. What does this tell you about the color of the compound copper sulfide, CuS?

3. What is the chemical formula for the compound dihydrogen sulfide?