1. Which of the following is not an acid?   H2SO4   NaOH   HNO3   HCl   Hint Half-n-half Clue   2. What is the combination of any substance with oxygen known as?   Hydrogenation   Combustion   Oxidation   Reduction   Half-n-half Clue   3. Heat is liberated in _______ reactions.   all chemical   endothermic   exothermic   substitution   Half-n-half Clue   4. Acids turn blue litmus paper _______.   yellow   colorless   red   pink   Half-n-half Clue   5. A substance that absorbs moisture is called _______.   amorphous   hydrophobic   hygroscopic   hydrophilic   Half-n-half Clue   6. The 'fizz' in soft drinks is caused by _______.   Carbon dioxide   hydrogen   nitrogen   helium   Half-n-half Clue   7. Solubility of a substance in a solvent usually increases with an increase in temperature.   True   False