1. H2O and FeS represent _______.   elements   mixtures   compounds   Hint Half-n-half Clue   2. Which of the following is a pure substance made up of one type of atoms?   Element   Mixture   Compound   Half-n-half Clue   3. Copper sulfate solution can be further subdivided into simpler substances by physical (mechanical) means. Therefore, it is _______.   a compound   an element   a mixture   Half-n-half Clue   4. Which of the following is a pure substance made up of two or more types of atoms or elements?   Mixture   Compound   Element   Half-n-half Clue   5. Which of the following is a compound?   Sodium sulfide   Sodium   Sodium sulfide solution   Half-n-half Clue   6. A mixture of water and oil is _______ in nature.   homogeneous   heterogeneous   7. Which of the following is an impure substance made up of two or more types of atoms or elements?   Compound   Mixture   Element   Half-n-half Clue