1. A substance that absorbs moisture is called _______.   hydrophobic   hydrophilic   amorphous   hygroscopic   Hint Half-n-half Clue   2. The two allotropes of phosphorus are _______ and _______.   Rhombic, Monoclinic   Crystalline, Amorphous   Alpha, Beta   Red, Yellow   Half-n-half Clue   3. Which of the following is not a physical change?   Oxidation   Decantation   Precipitation   Distillation   Half-n-half Clue   4. If no more solute can be dissolved in a solvent at a given temperature then that solution is called _______.   a dispersed solution   an unstable solution   a real solution   a saturated solution   Half-n-half Clue   5. What is the combination of any substance with oxygen known as?   Hydrogenation   Oxidation   Combustion   Reduction   Half-n-half Clue   6. A substance that speeds up the rate of a chemical reaction without undergoing any change itself is known as a _______.   counter ion   nucleus   catalyst   cation   Half-n-half Clue   7. Which of the following gases is green in color?   Chlorine   Hydrogen   Neon   Krypton   Half-n-half Clue