1. Solubility of a substance in a solvent usually increases with an increase in temperature.   False   True   2. Catalysts often speed up certain chemical reactions.   False   True   3. Which of the following is not a physical change?   Oxidation   Distillation   Precipitation   Decantation   Hint Half-n-half Clue   4. Lemon juice is   Acidic   Neutral   Basic   Metallic   Half-n-half Clue   5. A substance that absorbs moisture is known as   Hygroscopic   Hydrophobic   Hydrophilic   Amorphous   Half-n-half Clue   6. The two allotropes of phosphorus are   Alpha Phosphorus, Beta Phosphorus   Red Phosphorus, Yellow Phosphorus   Crystalline Phosphorus, Amorphous Phosphorus   Rhombic Phosphorus, Monoclinic Phosphorus   Half-n-half Clue   7. A pH of below 7 indicates   Alkalinity   Presence of Ions   Acidity   Purity of the sample   Half-n-half Clue