1. Copper sulfate solution can be further subdivided into simpler substances by physical (mechanical) means. Therefore, it is _______.   an element   a mixture   a compound   Hint Half-n-half Clue   2. Stainless steel is a mixture (alloy) of _______, _______, chromium, and nickel.   iron, carbon   lead, magnesium   copper, zinc   aluminum, tin   Half-n-half Clue   3. Oxygen cannot be further subdivided into simpler substances by any physical or chemical means. Therefore, it is _______.   an element   a compound   a mixture   Half-n-half Clue   4. Which of the following is an element?   Calcium chloride   Calcium chloride solution   Calcium   Half-n-half Clue   5. Potassium sulfide solution is a _______ mixture.   homogeneous   heterogeneous   6. Which of the following is a pure substance made up of one type of atoms?   Mixture   Element   Compound   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?   Atom   Molecule   Mixture   Element   Half-n-half Clue