1. The 'fizz' in soft drinks is caused by _______.   nitrogen   Carbon dioxide   helium   hydrogen   Hint Half-n-half Clue   2. Heat is liberated in _______ reactions.   substitution   endothermic   all chemical   exothermic   Half-n-half Clue   3. Which of the following is not an acid?   HCl   HNO3   H2SO4   NaOH   Half-n-half Clue   4. What gas is evolved when dilute sulfuric acid is added to zinc?   Hydrogen Peroxide   Sulfur Dioxide   Argon   Hydrogen   Half-n-half Clue   5. Which of the following gases is green in color?   Neon   Krypton   Hydrogen   Chlorine   Half-n-half Clue   6. Solubility of a substance in a solvent usually increases with an increase in temperature.   True   False   7. A substance that absorbs moisture is called _______.   hygroscopic   amorphous   hydrophilic   hydrophobic   Half-n-half Clue