1. H2 and Fe represent _______.   elements   compounds   mixtures   Hint Half-n-half Clue   2. Which of the following is an impure substance made up of two or more types of atoms or elements?   Mixture   Element   Compound   Half-n-half Clue   3. Which of the following is the smallest part of a compound, whose properties are the same as those of the compound?   Atom   Molecule   Mixture   Element   Half-n-half Clue   4. Which of the following is an element?   Calcium chloride solution   Calcium   Calcium chloride   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 _______.   a mixture   an element   a compound   Half-n-half Clue   7. Copper sulfate can be further subdivided into simpler substances by chemical means only. Therefore, it is _______.   a mixture   an element   a compound   Half-n-half Clue