1. Stainless steel is a mixture (alloy) of _______, _______, chromium, and nickel.   iron, carbon   aluminum, tin   lead, magnesium   copper, zinc   Hint Half-n-half Clue   2. 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   3. Which of the following is a compound?   Sodium sulfide   Sodium   Sodium sulfide solution   Half-n-half Clue   4. A mixture of water and oil is _______ in nature.   homogeneous   heterogeneous   5. The constituents of a mixture do not retain their original properties.   True   False   6. 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   7. Potassium sulfide solution is a _______ mixture.   homogeneous   heterogeneous