1. Which of the following is a pure substance made up of one type of atoms?   Mixture   Compound   Element   Hint Half-n-half Clue   2. Which of the following is an element?   Calcium chloride   Calcium chloride solution   Calcium   Half-n-half Clue   3. Which of the following is a mixture?   Potassium carbonate   Potassium carbonate solution   Potassium   Half-n-half Clue   4. Which of the following is the smallest part of a compound, whose properties are the same as those of the compound?   Mixture   Element   Molecule   Atom   Half-n-half Clue   5. The constituents of a mixture do not retain their original properties.   True   False   6. 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   7. Potassium sulfide solution is a _______ mixture.   heterogeneous   homogeneous