GS103 quiz 4, answer key

1. The chief reason why reaction rates increase with temperature is that a rise in temperature increases the number of activated molecules

2. In photosynthesis chlorophyll II acts to both catalyze and provide energy to the process

3. A solution of table salt, NaCl, in water is neutral

4. The symbol of the hydroxide ion is OH-

5. Approximately 4/5 of dry air consists of nitrogen

6. Fertilizers do not contain sodium

7. At room temperature and atmospheric pressure, ammonia is a gas whose formula in NH3

8. The structural elements of a polyester such as Dacron are esters

9. The energy liberated in a chemical reaction comes from the activation energy of atomic electrons

10. The decomposition of an unstable compound usually is exothermic

11. The number of moles of O2 needed to react with 10 moles of C2H2 in the reaction 2C2 H2 + 5O2 = 4CO2 + 2 H2O is. 25

12. The strongest bonds are metallic

13. In comparison with organic compound in general, most inorganic compounds are more stable when heated

14. Ethanol has OH groups in its molecules

15. Animal cells do not contain starch

16. In organic chemistry, an aromatic compound has benzene rings in its molecules

17. A double bond between two carbon atoms involves the sharing of a total of 4 electrons

18. The individual particles in a molecular solid are held together as a result of the attraction of polar molecules

19. Chemical reactions in solution do not depend to any great extent upon pressure

20. An example of covalent solid is diamond