1. A mixture of water and oil is _______ in nature.   heterogeneous   homogeneous   2. Copper sulfate can be further subdivided into simpler substances by chemical means only. Therefore, it is _______.   a compound   a mixture   an element   Hint Half-n-half Clue   3. Which of the following is a pure substance made up of two or more types of atoms or elements?   Compound   Mixture   Element   Half-n-half Clue   4. Which of the following is a compound?   Sodium   Sodium sulfide solution   Sodium sulfide   Half-n-half Clue   5. The constituents of a mixture do not retain their original properties.   True   False   6. Which of the following is a mixture?   Potassium carbonate solution   Potassium   Potassium carbonate   Half-n-half Clue   7. Oxygen cannot be further subdivided into simpler substances by any physical or chemical means. Therefore, it is _______.   an element   a mixture   a compound   Half-n-half Clue