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