Write the chemical formulas and write the chemical name Observe the reactions and identify the color of the compound formed Think about street lamps: a sodium street lamp has a yellow color because of the intense yellow line in its atomic spectrum Describe the Names and Formulas of Ionic Compounds Experiment -You will be making a series of ionic compounds with the cations (Ag+, Pb+, Ca2+, Fe3+, and Cu2+) The 2 taller lines swap places left and right when you change from wavelength to frequency Why do you see more lines for the new lamps than for H or He? Apply this to a real-life example -A larger atom has more lines and a more complex spectrum The numbers change (of course) and the placement of the lines flip Colors are different as well: helium has 1 blue, 2 violet, 1 yellow, 1 orange, and 2 red What happens when you click on the wavelength/frequency button for Helium? What happens to the lines and what do you notice about the numbers on the x-axis on the Intensity plot below the spectrum? (Atomic Emission Spectra Experiment) -Wavelength and frequency scales increase from left to right as we expect Analyze why you see more lines for these lamps than for Hydrogen and Helium What 2 equations are used in the Atomic Emission Spectra Experiment? v = c/wavelengthÄ® = hv How is the helium spectrum different from the hydrogen spectrum in the Atomic Emission Spectra Experiment? -Different in that hydrogen only had 4 lines while helium has 6. Lastly, replace Helium lamp with either Ne, Na, or Hg lamps. Click wavelength/frequency button and record the wavelength, frequency, and energy of the helium peak on the far right Replace hydrogen gas with helium gas (turn on spectrometer and click visible/full switch to view only the visible spectrum) Then calculate the frequency and energy of each wavelength ![]() Record the wavelengths of the 4 peaks in the visible hydrogen spectrum Click on the visible/full switch to magnify the visible spectrum only Notice the 4 lines on the graph (violet, blue, aqua, red) The intensity and wavelength of the light that is emitted is called the atomic emission spectrum and is unique for each gas Describe the Atomic Emission Spectra Experiment -Spectrometer and graph of intensity vs wavelength appears on screen About 7000 x heavier What is the atomic emission spectra? -When a sample of gas is excited by applying a large alternating electric field, the gas emits light at certain discrete wavelengths This movement is the same when applying an electric field (opposite movement) Why does it take stronger magnetic and electric field strengths to move the beam of alpha particles compared with the beam of electrons (beta particles)? (Investigating the Properties of Alpha and Beta Particles) The alpha particle is large compared to the electron. Electrons move right when applying a magnetic field Is the movement the same when applying an electric field? (Investigating the Properties of Alpha and Beta Particles) -Movement is opposite Analyze affect of electric and magnetic field on x-rays (none bc x rays have no charge unlike alpha and beta particles) Compare the movement of electrons when applying a magnetic field vs the movement of alpha particles when applying a magnetic field. Select laser and video camera from Stockroom Compare movement of alpha and beta particles in magnetic and electric fields ![]() Swap out the electron gun with the Alpha Source from the Stockroom Change the value of the electric field, spot moves left Push the grid button and change the value of the magnetic field, spot moves right Alpha particles are helium atoms without its 2 electrons, positively charged What particles did Robert Millikan use in his Oil-Drop Experiment? Beta Particles Describe the "Investigating the Properties of Alpha and Beta Particles Experiment" -Turn on phosphor detection screen What particles are ejected during nucleus decay? (Investigating the Properties of Alpha and Beta Particles -Alpha and Beta Particles
0 Comments
Leave a Reply. |