Chem Lab

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Submitted By phamk93
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II. Data/ Results

A. Spacing between grooves for the diffraction grating in the slide holder Length from laser to n=0: 146.5cm Distance between n=0 and n=1: 19cm = 7.39 = 650nm nλ=dsinθ 1650×10-9=dsin(7.39) d=5.05×10-6m B. Spectrometers and Atomic Emission

Continuous White-light Emission

Color | Range (nm) | Violet | 400 | Blue | 465 | Green | 530 | Yellow | 580 | Orange | 610 | Red | 650 |

H-atom Emission Line Data: Balmer Series

H lines |  (nm) | n initial | Violet | 410 | 6 | Violet-blue | 430 | 5 | Blue-green | 480 | 4 | Red | 650 | 3 |

H-atom Emission Line Results: Balmer Series H lines | 1/n2 initial | E (J) | Violet | 1/36 | 4.848x10-19 | Violet-blue | 1/25 | 4.623x10-19 | Blue-green | 1/16 | 4.141x10-19 | Red | 1/9 | 3.058x10-19 |

Figure 1. Scatter plot of E (y-axis) vs. 1/n2 initial (x-axis) for H-atom emission lines

Figure 2. Atomic Line Spectra of Ne-atom

Emission Lines of Ne-atom | Color | λ (nm) | Red | 695,665,660,651,640 | Orange | 625,621,620,615 | Yellow | 605,590,585,575,570 | Green | 540,535 | Blue | 459,450,445,440 |

Figure 3. Atomic Line Spectra of He-atom

Emission Lines of He-atom | Color | λ (nm) | Red | 700,650 | Yellow | 590 | Green | 500, 490, 485 | Blue | 465 | Violet | 440 |

Table 4. Flame Test Data | | Metal ion | Color observed | Ba(NO3)2 | Yellow-green | Sr(NO3)2 | Red-orange | Ca(NO3)2 | Violet | KNO3 | Yellow-orange | NaNO3 | Red | LiNO3 | Red |

1. Calculate E for the violet-blue line you observed
∆E=hcλ

∆E=(6.626×10-34)(3×108)430×10-9=4.623×10-19J

2. Calculate Eionization for an electron of a H-atom in a n=2 state
∆Eionization=2.18×10-18(Z2)(1n2initial)

∆Eionization=2.18×10-1812122=5.45×10-19J

Discussion Questions: 1. Electrons can only absorb or emit energy at discrete…...

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