6. Which of the following substances is an example of a compound? A. Aluminum C. Oxygen B. Carbon D. Water 7. Which of the following substances is an element? A. Salt C. Sugar B. Sulfur D. Water 8. Which of the following symbols shows a symbol of an element? A. Fe C. 02 B. Fe2O3 D. Fe + O FeO2 grade 7 need na Po no