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Extra info for AP Chemistry, 2014-2015 Edition
68. D—The weak acid and weak base give a nearly neutral solution, as they will tend to neutralize each other. 69. C—Only B and C are buffers. B is acidic (pH < 7) and C is basic (pH > 7). 70. B—Only B and C are buffers. B is acidic (pH < 7) and C is basic (pH > 7). Take a Diagnostic Exam ❮ 31 71. 0010 × 9 × 10−9)1/2 = (9 × 10−12)l/2 −12 −6 Estimate—the square root of 10 will be 10 . 83. 0 C/s. 50 h )⎜ ⎜⎝ ⎟⎠ ⎜⎝ ⎝ 96,500 C ⎟⎠ s h 72. C—K = Ksp/Ka1Ka2 In this case, the key is setting up the calculation but not doing the calculation.
37. C—According to Hund’s rule, the nitrogen 2p electrons enter the 2p orbitals individually (with spins parallel). 25. C—This is a basic postulate of kinetic molecular theory. 38. A—The Pauli exclusion principle states this limitation for all orbitals. 26. A—This is one of the properties of free energy. 39. B—The d orbitals are less effectively shielded than the s orbitals. Due to this difference, the s orbitals have lower energy. 27. B—This is the definition of the lattice energy. 28. B—This is an application of Hess’s law.
How Do I Register and How Much Does It Cost? If you are enrolled in AP Chemistry in your high school, your teacher is going to provide all of these details. You do not have to enroll in the AP course to register for and complete the AP exam. com Students who demonstrate financial need may receive a refund to help offset the cost of testing. There are also several optional fees that are necessary if you want your scores rushed to you, or if you wish, to receive multiple grade reports. What Should I Do the Night Before the Exam?