SI Practice Exam 1

SI Practice Exam 1 - ENGR 145: Chemistry of Materials SI...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
ENGR 145: Chemistry of Materials SI Practice Exam I 1. In an effort to reduce the commercial power consumption of your dorm room (even if only very, very slightly), you want to engineer an electricity generating device that uses the photoelectric effect. After doing research on the subject, you decide that you will place a cesium electrode in the sunlight and wire the electrode to power your room. a) Knowing that Cs has a work function of Φ =3.36 x 10 -19 J and that sunlight has a wavelength of λ =500 nm, what will be the average kinetic energy of the generated electrons? b) With what velocity will each electron be emitted from the electrode? (HINT: mass of e - = 9.11 x 10 -31 kg) c) Next year, if you were to transfer to a school that got more sunlight than Case (the intensity of the sunlight was higher), would the velocity of the photoelectrons increase? Why or why not? d) In the sunnier climate, would your cesium electrode be able to generate more electricity (emit a larger number of electrons)? Why or why not?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2. Answer the following questions about electron configuration and periodicity. a) Draw the electron configuration of the following elements: Mg, P, S b) Based on these electron configurations, rank the four compounds from lowest to highest ionization energy. Explain your reasoning. c) The presence of the d and f orbitals greatly diminishes changes in ionization energy between subsequent atoms in the periodic table. Suggest why. d) Copper has an electron configuration different from what you would expect. Draw its configuration and explain why copper adopts this configuration.
Background image of page 2
3. The properties of refractory ceramics are extremely important to the metal casting industry.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 04/28/2010.

Page1 / 9

SI Practice Exam 1 - ENGR 145: Chemistry of Materials SI...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online