1. H2 and Fe 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?   Mixture   Compound   Element   Half-n-half Clue   3. Potassium sulfide solution is a _______ mixture.   homogeneous   heterogeneous   4. H2O and FeS represent _______.   mixtures   elements   compounds   Half-n-half Clue   5. Which of the following is an element?   Calcium chloride   Calcium chloride solution   Calcium   Half-n-half Clue   6. Copper sulfate solution can be further subdivided into simpler substances by physical (mechanical) means. Therefore, it is _______.   a mixture   a compound   an element   Half-n-half Clue   7. The constituents of a mixture do not retain their original properties.   True   False