1. Which of the following is the smallest part of a compound, whose properties are the same as those of the compound?   Element   Atom   Mixture   Molecule   Hint Half-n-half Clue   2. Which of the following is an element?   Calcium chloride   Calcium chloride solution   Calcium   Half-n-half Clue   3. H2 and Fe represent _______.   compounds   mixtures   elements   Half-n-half Clue   4. Which of the following is a pure substance made up of one type of atoms?   Mixture   Element   Compound   Half-n-half Clue   5. Which of the following is a compound?   Sodium sulfide solution   Sodium sulfide   Sodium   Half-n-half Clue   6. Which of the following is an impure substance made up of two or more types of atoms or elements?   Compound   Mixture   Element   Half-n-half Clue   7. 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