1. Fill in the missing word: Acid + _______ = Salt + Water   Oxygen   Base   Non Metal   Metal   Hint Half-n-half Clue   2. A pH below 7 indicates _______.   purity of the sample   acidity   alkalinity   presence of ions   Half-n-half Clue   3. Which of the following is not a physical change?   Decantation   Oxidation   Distillation   Precipitation   Half-n-half Clue   4. What is the combination of any substance with oxygen known as?   Reduction   Combustion   Hydrogenation   Oxidation   Half-n-half Clue   5. A substance that absorbs moisture is called _______.   hydrophilic   hygroscopic   amorphous   hydrophobic   Half-n-half Clue   6. If no more solute can be dissolved in a solvent at a given temperature then that solution is called _______.   a dispersed solution   a saturated solution   an unstable solution   a real solution   Half-n-half Clue   7. Lemon juice is _______ in nature.   metallic   neutral   basic   acidic   Half-n-half Clue