Consider Fig. 11.9. According to the caption and picture, water seems to go from one beaker to another. a. Explain why this occurs. b. The explanation in the text uses terms such as vapor pressure and equilibrium. Explain what these have to do with the phenomenon. For example, what is coming to equilibrium? c. Does all the water end up in the second beaker? d. Is water evaporating from the beaker containing the solution? If so, is the rate of evaporation increasing, decreasing, or staying constant? Draw pictures to illustrate your explanations.

9/7 CHAPTER 1 Essential Ideas (cont.) Measurement (cont) 1) The goal is to be accurate and precise a) Accuracy: the degree to which the result of a measurement, calculation, or specification conforms to the correct value or a standard. b) Precision: the degree to which the results are similar (how often you get the same number) Scientific Notation 1) A method for writing numbers that is more prec−6e and often shorter a) Example: .0000025 = 2.5 × 10 2) Significant Figures a) The numbers we know precisely b) Zeros in Significant Figures i) Zeros in the middle of numbers are significant. Z