1. Which of the following is a compound?   Sodium sulfide   Sodium   Sodium sulfide solution   Hint Half-n-half Clue   2. H2 and Fe represent _______.   compounds   mixtures   elements   Half-n-half Clue   3. Potassium sulfide solution is a _______ mixture.   homogeneous   heterogeneous   4. H2O and FeS represent _______.   compounds   mixtures   elements   Half-n-half Clue   5. Stainless steel is a mixture (alloy) of _______, _______, chromium, and nickel.   lead, magnesium   aluminum, tin   copper, zinc   iron, carbon   Half-n-half Clue   6. 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   7. Which of the following is a pure substance made up of one type of atoms?   Compound   Mixture   Element   Half-n-half Clue