2-2.3 - Most missed from HW1: How many moles of atoms are...

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1 Most missed from HW1: How many moles of atoms are in 15.5 grams of PF 3 ? 1. 0.176 mol atoms 2. 1.06e23 mol atoms 3. 4.24e23 mol atoms 4. 0.705 mol atoms Models of the Atom 1903 Thompson “Plum Pudding” ht p:/ wind.cc.whecn.edu/~mechalke/chapter5/Chapter5.htm 1911 Rutherford ht p:/ www.mbe.doe.gov/me70/manhat an/1890s-1939.htm Section 2.0 ? How do you study something that you can’t look inside of? Throw a probe at it, and see what comes out. Section 2.0 Light exists as a wave Waves come in all different sizes and colors Long wavelength Short Wavelength Wavelength = (lambda) Light is a form of energy called electromagnetic radiation. Section 2.1 Frequency So we can measure a wave’s frequency ( n ) , or how many waves pass a given point in one second frequency ( ,nu) = # waves/sec All light waves travel at the same speed, the speed of light (c) = 3.0 x 10 8 m/s Section 2.1 Shorter Wavelength HIGHER FREQUENCY ( more waves/sec) Frequency Longer Wavelength LOWER FREQUENCY ( less waves/sec) Section 2.1
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2 Long Wavelength = Low Frequency Short Wavelength = High Frequency c =  n c is the speed of light (3.0x10 8 m/s) is wavelength (m) n is frequency (s -1 or hertz) Section 2.1 Wavelength and Frequency speed = (wavelength)(frequency) So, if you know wavelength, you know frequency and vice versa!
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2-2.3 - Most missed from HW1: How many moles of atoms are...

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