2. Which of these is an example of a covalent compound? Week9 1. The reaction for photosynthesis is 6CO2 + 6H2O  C6H12O6 + 6O2. How many oxygen atoms, O, are released for every 1 glucose, C6H12O6 , produced? 1 c. 6 2 d. 12 2. Which of these is an example of a covalent compound? Sodium monochloride Trimagnesium dinitride Calcium chloride Sulfur dioxide

3. The formula for dinitrogen tetraoxide is N3O3 NO N2O2 N2O4 4. Which of the following is a characteristic of an ionic bond? Low melting point Shares electrons Good conductor of electricity in aqueous solutions Insoluble

5. Complete the following reaction. NaOH (aq) + HCl (aq)  ______ + H2O (l) 2NaCl (s) NaCl (g) NaCl (aq) 2NaCl (aq) 6. Which of the following is a true statement? Matter is conserved in a chemical reaction. Matter is created in a chemical reaction. Matter is destroyed in a chemical reaction. All of the above statements can be true depending on the reaction.

7. Which of the following involves a chemical change? Snow melting into water An apple rotting on a tree Boiling water until vapor forms Making sweet iced tea 8. In chemistry class, Mr. V added some sodium to a beaker of water. The sodium reacts violently with the water, producing a flame. The end products are hydrogen gas and sodium hydroxide. Which of the following is the correct balanced equation for the reaction described above? 2 Na + 2 H2O  2 NaOH + H2 Na + H2O + O2  3 NaOH + H2 H2O2 + 2Na  2 NaOH + H2 2 NaOH + H2  2 Na + 2 H2O

9. The following reaction is propane burning in oxygen to produce carbon dioxide and steam. __C3H8 + __O2  __CO2 + __H2O Which of the following sets of numbers will balance this equation? 1, 5, 3, 4 1, 3, 4, 5 5, 4, 3, 1 4, 5, 1, 3

10. The electrolysis of water is performed by passing an electric current through water to break the chemical bonds that hold it together. What kind of reaction is this? 2 H2O  2H2 + O2 Synthesis Decomposition Single replacement Double replacement