Science 10:  Today we handed in the Energy Practice Test and we wrote the Energy Test.  No homework is due on Monday.

Chemistry 11:  Today we marked the Lewis Dot Structures, then did Lab 12B (Procedure 1,2 4 only).  A few of you need to finish the Lewis Dot Structures and show me on Monday.

Chemistry 12:  U4 # 74-79 due Monday.  No due date set for Lab 20G.  I did not get to check U4 # 69 and 71, but I would like to check this on Monday.

K_a Calculations Answer Key

74.  [H⁺] = 6.7 x 10^-5

75.  pH 6.16

76.  [HCOOH] = .78 M

77.  Ka = 9.38 x 10^-3

78.  [H2CO3]  = 0.010 M

79.  pH 4.89

80.  Ka = 2.06 x 10^-10