#5 Assignment Chapter 8: Applying Your Knowledge 4. (a) 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(g) (b) C3H8(l) + 5 O2(g) 3 CO2(g) + 4 H2O(g) (c) 2 C6H6(l) + 15 O2(g) 12 CO2(g) + 6 H2O(g) (d) 2 C3H8O(l) + 9 O2(g) 6 CO2(g) + 8 H2O(g) (a) One (b) Ten (c) Ten
Due Date: 3/2/07 Chemistry 106
8.
14. Molar mass is the mass, in grams of one mole of any substance. It is the mass of Avogadros number of atoms or molecules of a substance. 18. At higher temperatures, molecules (on average) move faster, so that more of them have enough energy to get over the energy activation hill and react. Thus, increased temperature increases the rate of a chemical reaction. 22. A catalyst decreases the amount of activation energy that is needed to generate a reaction. 26. Biological catalysts are known as enzymes. 38. (a) Entropy decreases in this reaction because the disorder in this system decreases. (b) Entropy increases in this combustion reaction because the disorder in this system increases. 40. (a) C6H12O6 = 180 g (b) H2SO4 = 98 g (c) Na2HPO4 = 142 g (d) Ca (NO3)2 = 164 g
The Periodic Table: Hydrogen