Calculate the molar solubility of CaF2 at 25 °C in a solution that is (a) 0.010 M in Ca(NO3)2, (b) 0.010 M in NaF. Solution (a) Here, Ca2+ is the common ion: CaF2 (s) = Ca2+ (aq) + 2F- (aq) Initial (M) Eq (M) I 0.010 0.010+x= 0.010 Ksp = [Ca2+] [F] => Ksp = (0.010) (2x)² 0 2x => 3.9 × 10-11 = (0.010) (4 x = 3.1 x 10-5 M 2 x = 6.2 × 10-5 M = [F] 6.2 x 10-5 mol F- 1 mol CaF2 Thus: X = 3.1 x 10-5 M CaF2 2 mol F- L Thus, 3.1 x 10-5 mol CaF2 should dissolve in 1.0 L of 0.010M Ca(NO3)2

The gold nucleus has a mass of 3.27 × 10–25 kg. What is the density of the nucleus (in g cm–3)?   Question 2 options:   2.7 × 1014   3.5 × 1014   1.4 × 1014

152 A 352.44 Your Answer: 155 T 362.31 Answer 153 units Gö G D 355.67 156 X 154 365.88 359.12 157 You time travel 100 years into the future and learn that several new elements have been discovered, as pictured. These elements are frequently found as oxides, and need to be separated in order to extract the pure element. Before going through this effort, it is useful to know what amount of the element can be extracted. How many moles of element A can be extracted from 175 grams of A5012? N 369.52

Which of the following includes two chronometric dating method techniques? Group of answer choices Carbon-14 and K/Ar (Potassium Argon) Uranium Series and Paleomagnetism ESR (electron spin resonance) and Stratigraphy

One atom of calcium weighs 6.02 x 1023 amu 20 g 20 amu 40.08 g none of these

On the following page, you will find the IR, 13C-NMR and ¹H-NMR for C6H12O. Determine the structure of the molecule. As you solve the structure, keep the following questions in mind: • What is the index of hydrogen deficiency for this formula? • Using the IR, what functional group(s) is (are) present in the molecule? What functional groups are missing? At what chemical shift range should look for corresponding peaks in the CNMR? In the HNMR? Are there peaks in those regions? • How many peaks are in the carbon NMR spectrum? How does it compare to the chemical formula? What might this tell you about the molecule? • How many peaks are in the proton NMR spectrum? How does it compare to the chemical formula? What might this tell you about the molecule? .

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