FlameTest-UniversityofPennsylvania火焰测试-宾夕法尼亚大学

Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Flame Test,and the EMS,Absorption and Emission of Light in a Flame,When a substance is heated in a flame,the substances electrons absorb energy from the flame.,Absorption and Emission of Light in a Flame,This absorbed energy allows the electrons to be promoted to EXCITED energy levels and the electrons are“kicked up notch to a higher energy level.,Absorption and Emission of Light in a Flame,The electrons naturally want to make a transition,or RELAX,back down to the ground state(lowest energy level).,Absorption and Emission of Light in a Flame,When an electron makes a transition from a higher energy level to a lower energy level,a particle of light called a photon is emitted.,We are PHOTONS!,Absorption and Emission of Light in a Flame,The energy of a photon is equal to the difference in energy between the excited state and the state to which the electron relaxes.,Absorption and Emission of Light in a Flame,The energy of the emitted photon determines the color of light observed in the flame(expressed in W,AVELENGTHS,).,Absorption and Emission of Light in a Flame,The color of light varies from substance to substance,depending on the electron configuration.,How is each substance unique?,Difference between energy levels,Exact energy of the emitted photon,Corresponding wavelength and color,EMS,The visible portion of the EMS is only a small part of the entire spectrum.,Types of Emissions,Radio waves,Used for radio and,television communication,Types of Emissions,Microwaves,Used in radar signals and microwave ovens,Types of Emissions,Infrared radiation,Given off in the form of heat,Types of Emissions,Visible Light,Small portion of the EMS,Wavelength region between 400 and 700nm,As the color of light changes,so does the amount of energy it possess,Types of Emissions,Ultra Violet(UV),Given off by the SUN,Types of Emissions,X-Rays,Used to detect bones,and teeth,Types of Emissions,Gamma Rays,May be given off by radioactive materials,Types of Emissions,