Practice Final-Hale - The cobalt steel alloy is used in...

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The cobalt steel alloy is used in what industry? Vanadium steel is an alloy where the two main elements are iron and what other metal? Which would you expect to be more acidic: CrO, Cr 2 O 3 or CrO 2 ? What is the shape of PCl 5 ? What is the oxidation number of Co in [CoCl 2 (NH 3 ) 4 ] + ? What is the coordination number of [CoCl 2 (NH 3 ) 4 ] + ? Why does Li melt at a higher temperature than Na? Does the following complex form a low or high spin complex? [CrCl 5 ] 3- Explain the trends in atomic size with respect to the d -block elements. What oxides tend to be basic, acidic and amphoteric? (general trends not specific) Which Sn-O bond is the strongest? Which is more acidic? SnO 2 or SnO 4 Draw the mirror image of the following and state whether or not they are chiral. Cl Cl F F Br Br F Cl F Cl Br Br Cl Cl F I Br I Cl F F I Br I
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(Questions 1 and 2) Americium-241 is used in a number of smoke detectors; as this radioisotope decays it causes particles to ionize, conduct an electric current and thereby cause the alarm to buzz. The complete decay of Am 241 involves (successively) α,α,β,α,α,β,α,α,α,β,α and β production. 1. The isotope that undergoes the first β particle emission is: a. U-233 b. Pa-233 c. Pa-239 d. Am-241 2. The isotope obtained when Am-241 has completed this decay sequence is: 3. Species with unpaired electrons are paramagnetic and 4. Diamagnetic substances a. are attracted to a magnetic field because they contain unpaired electrons. b. are repelled by a magnetic field because they contain only paired electrons. c. become permanently aligned in a magnetic field. d. are not affected by a magnetic field. 5. Which of the following is paramagnetic? 6. Of the following, the central metal ion most likely to form a colorless complex is a. Ti 3+ . b. Mn 4+ . c. Co 2+ . d. Zn 2+ . 7. The half-life of nickel-63 is 85 years. How old is a painting with an activity that is 3.5% of the steady-state rate for Ni-63? 8. If water is replaced by ammonia in the [Fe(H 2 O) 6 ] 3+ complex, the splitting of the d- orbitals would 9. Water gas, a commercial fuel, is made by the reaction of hot coke with steam. C(s) + H 2 O(g) ----> CO(g) + H 2 (g) When equilibrium is established at 800°C the concentrations of CO, H 2 , and H 2 O are 4.00 x 10 -2 , 4.00 x 10 -2 , and 1.00 x 10 -2 mole/liter, respectively. What is the value of G° for
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