1. A substance that absorbs moisture is called _______.   amorphous   hydrophilic   hygroscopic   hydrophobic   Hint Half-n-half Clue   2. If no more solute can be dissolved in a solvent at a given temperature then that solution is called _______.   a saturated solution   an unstable solution   a real solution   a dispersed solution   Half-n-half Clue   3. Which of the following is not a physical change?   Precipitation   Distillation   Oxidation   Decantation   Half-n-half Clue   4. What gas is evolved when dilute sulfuric acid is added to zinc?   Hydrogen   Hydrogen Peroxide   Sulfur Dioxide   Argon   Half-n-half Clue   5. Which of the following is a chemical change?   Dissolving of salt in water   Rusting of iron   Freezing of water   Boiling of water   Half-n-half Clue   6. Catalysts speed up the rate of chemical reactions.   True   False   7. Solubility of a substance in a solvent usually increases with an increase in temperature.   True   False