1. Oxygen cannot be further subdivided into simpler substances by any physical or chemical means. Therefore, it is _______.   an element   a compound   a mixture   Hint Half-n-half Clue   2. Which of the following is a compound?   Sodium sulfide solution   Sodium sulfide   Sodium   Half-n-half Clue   3. Which of the following is a pure substance made up of two or more types of atoms or elements?   Mixture   Compound   Element   Half-n-half Clue   4. The constituents of a mixture do not retain their original properties.   True   False   5. Which of the following is the smallest part of a compound, whose properties are the same as those of the compound?   Element   Mixture   Atom   Molecule   Half-n-half Clue   6. H2O and FeS represent _______.   compounds   mixtures   elements   Half-n-half Clue   7. Copper sulfate solution can be further subdivided into simpler substances by physical (mechanical) means. Therefore, it is _______.   a compound   an element   a mixture   Half-n-half Clue