General Chemistry - Final Exam 03

General Chemistry - Final Exam 03 - CHM 1300 and CHM 1310 B...

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CHM 1300 and CHM 1310 B DATE: December 12, 2003 Dr. Rashmi Venkateswaran 9:30 am TIME: 3 hours Page 1 of 20 STUDENT NAME: (Print) _________________________________________________ STUDENT NUMBER: ___________________________________________________ COURSE CODE: (Please circle) CHM 1300 CHM 1310B INSTRUCTIONS: 1. Write your answers on the exam. Please BOLD or HIGHLIGHT your final answer. 2. You are allowed to use electronic calculators during the exam (TI 30X, TI 34, TI 36). 3. Equations and constants are given on pages 18 and 19. A periodic table of the elements is included (page 20). Standard reduction potentials are on page 17. 4. Use the correct number of significant figures at all times. 5. Marks allotted to each question are shown in brackets. 7. Use the back of sheets for rough work. Two extra (blank) pages (15 and 16) have also been included. 8. You are advised to read through the exam paper before you begin to write. Answer first those questions that you can do right away, proceeding to more difficult questions thereafter. Allow about ten minutes near the end of the exam period to read quickly through your answers, checking for obvious errors. Quest. 1 2 3 4 5 6 7 8 9 10 11 Marks /10 /3 /10 /12 /10 /10 /4 /6 /10 /15 /10 /100
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page 2 of 20 (10) 1. The rays of the Sun that cause tanning and burning are in the ultraviolet portion of the electromagnetic spectrum. These rays are categorized by wavelength: so-called UV-A radiation has wavelengths in the range of 320- 380 nm, whereas UV-B radiation has wavelengths in the range of 290-320 nm. (a) Calculate the frequency of light that has a wavelength of 320 nm. (b) Calculate the energy of a mole of 320 nm photons. (c) Which are more energetic, photons of UV-A radiation or photons of UV-B radiation? (d) The UV-B radiation from the Sun is considered a greater cause of sunburn in humans than is UV-B radiation. Is this observation consistent with your answer to part (c)? If so, why? If not, why not?
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page 3 of 20 (e) Microwave ovens use microwave radiation to heat food. The microwaves are absorbed by moisture in the food, which is then transferred to other components of the food. As the water becomes hotter, so does the food. Suppose that the microwave radiation has a wavelength of 11.2 cm. How many photons are required to heat 200 mL of coffee from 23ºC to 60ºC? (Assume coffee has the same density as water.) (3) 2. Scientists have speculated that element 126 might have a moderate stability allowing it to be synthesized and characterized. Predict what the condensed electron configuration of this element might be. Why does it have this structure? What is it about this configuration that gives it stability?
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page 4 of 20 (10) 3. Compare the elements chlorine and fluorine with respect to the following properties: i) electron configuration; ii)
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General Chemistry - Final Exam 03 - CHM 1300 and CHM 1310 B...

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