1. Copper sulfate solution can be further subdivided into simpler substances by physical (mechanical) means. Therefore, it is _______.   an element   a compound   a mixture   Hint Half-n-half Clue   2. The constituents of a mixture do not retain their original properties.   True   False   3. Which of the following is a compound?   Sodium sulfide solution   Sodium sulfide   Sodium   Half-n-half Clue   4. Which of the following is an element?   Calcium chloride   Calcium chloride solution   Calcium   Half-n-half Clue   5. Which of the following is an impure substance made up of two or more types of atoms or elements?   Element   Mixture   Compound   Half-n-half Clue   6. Which of the following is a mixture?   Potassium   Potassium carbonate   Potassium carbonate solution   Half-n-half Clue   7. Potassium sulfide solution is a _______ mixture.   homogeneous   heterogeneous