1. Which of the following is an element?   Calcium chloride solution   Calcium chloride   Calcium   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?   Element   Mixture   Compound   Half-n-half Clue   3. The constituents of a mixture do not retain their original properties.   True   False   4. Copper sulfate can be further subdivided into simpler substances by chemical means only. Therefore, it is _______.   a compound   an element   a mixture   Half-n-half Clue   5. Which of the following is a pure substance made up of one type of atoms?   Compound   Element   Mixture   Half-n-half Clue   6. H2 and Fe represent _______.   compounds   elements   mixtures   Half-n-half Clue   7. Which of the following is the smallest part of a compound, whose properties are the same as those of the compound?   Mixture   Element   Atom   Molecule   Half-n-half Clue