Name: Regents Chemistry Review Packet B2
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1 Name: Regents Chemistry Review Packet B2 1. Determine the volume of 2.00 M HCl(aq) solution required to completely neutralize 20.0 milliliters of 1.00 M NaOH(aq) solution. 2. Determine the mass of that dissolves in 100. grams of water at to produce a saturated solution. 3. State, in terms of molecular polarity, why ethanol is soluble in water. Base your answers to questions 4 through 6 on the information below and on your knowledge of Three elements, represented by D, E, and Q, are located in Period 3. Some properties of these elements are listed in the table below. A student's experimental result indicates that the density of element Q is, at room temperature and standard pressure. 4. Identify the physical property in the table that could be used to differentiate the samples of the three elements from each other. 5. Identify the group on the Periodic Table to which element D belongs.
2 6. Determine the percent error between the student's experimental density and the accepted density of element Q. Base your answers to questions 7 through 9 on the information below and on your knowledge of The equation below represents an equilibrium system of reaction can be catalyzed by vanadium or platinum.. The 7. Compare the rates of the forward and reverse reactions at equilibrium. 8. State how the equilibrium shifts when is removed from the system. 9. potential energy diagram for the forward reaction is shown above. On this diagram, draw a dashed line to show how the potential energy changes when the reaction occurs by the catalyzed pathway.
3 Base your answers to questions 10 and 11 on the information below and on your knowledge of The formulas for two compounds are shown below. 10. Explain, in terms of bonding, why compound A is saturated. 11. Explain, in terms of molecular structure, why the chemical properties of compound A are different from the chemical properties of compound B. Base your answers to questions 12 through 15 on the information below and on your knowledge of Some isotopes of potassium are K-37, K-39, K-40, K-41, and K-42. The natural abundance and the atomic mass for the naturally occurring isotopes of potassium are shown in the table below. 12. Identify the decay mode of K-37.
4 13. Complete the nuclear equation below for the decay of K-40 by writing a notation for the missing nuclide. 14. Determine the fraction of an original sample of K-42 that remains unchanged after hours. 15. Show a numerical setup for calculating the atomic mass of potassium. Base your answers to questions 16 through 18 on the information below and on your knowledge of The Bohr model of the atom was developed in the early part of the twentieth century. A diagram of the Bohr model for one atom, in the ground state, of a specific element, is shown below. The nucleus of this atom contains 4 protons and 5 neutrons. 16. State the atomic number and the mass number of this element. Atomic number: Mass number:
5 17. State the number of electrons in each shell in this atom in the ground state. Number of electrons in first shell: Number of electrons in second shell: 18. Using the Bohr model, describe the changes in electron energy and electron location when an atom changes from the ground state to an excited state.
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