1. H2O and FeS represent _______.   compounds   mixtures   elements   Hint Half-n-half Clue   2. 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   3. Stainless steel is a mixture (alloy) of _______, _______, chromium, and nickel.   copper, zinc   iron, carbon   lead, magnesium   aluminum, tin   Half-n-half Clue   4. 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   5. Potassium sulfide solution is a _______ mixture.   homogeneous   heterogeneous   6. Which of the following is a compound?   Sodium sulfide solution   Sodium sulfide   Sodium   Half-n-half Clue   7. A mixture of water and oil is _______ in nature.   heterogeneous   homogeneous