Chem 141 exam 2 MSU Questions and Answers 100% Pass

Chem 141 exam 2 MSU Questions and Answers 100% Pass Describe the relationship between the frequency, wavelength, and velocity (speed) of a wave. The more times the wave is passing through a point in space = a higher frequency, the higher frequency creates a smaller wavelength, which is why the smallest wave is a gamma wave, it has the highest frequency and the shortest distance between waves, the velocity can be measured in m/s and is composed of frequency and wavelength Calculate any one (frequency, wavelength, or velocity) given the other two. 3x10^8=(W)(V) PROBLEM: 3x10^8=W(3x10^18) W= 1.0x10^-10 meters Rank electromagnetic radiation (gamma ray, X-ray, UV, visible, IR, radio wave, microwave) in terms of energy, wavelength, or frequency From shortest wavelength and highest frequency Gamma, x ray, UV, visibile (pink-blue-green-yellow-red), microwave, radio wave Describe and identify experimental evidence for why electromagnetic radiation is a wave. Constructive interference is where two waves in phase intensifies the light and deconstructive interference is where wave is opposite phase cancels out and it is dark. The double slit experiment also shows this; where the waves crisscross creates light on the screen and where they cancel out is where there is black on the screen. Visible light can be detracted and bent. Make an argument (claim, evidence, reasoning) about why we consider electromagnetic radiation as a particle. Claim; electromagnetic radiation can be looked at as a particle. Evidence/Reasoning; During the photoelectric effect, photons were blasted at a sheet of metal. The photons being light *particles, were able to attach themselves to electrons causing them to rise in energy levels and eventually go high enough to be ejected from the metal sheet. This resulted in an emission spectrum. Explain why the existence of photons (quantized light energy) explains the photoelectric effect. Electrons floating around in the electron cloud are attracted to the proton or protons and will need a certain amount of energy to hit them and causes the interaction to become unstable. Once the photon (light particle) hits the electron, the electron will have too much energy and the interaction will break resulting in a release of said electron. Explain how (and why) different atoms emit different wavelengths of light Each atom has different levels of energy holding the electrons close to the nucleus, different levels of energy will be needed to eject certain electrons ex. one atom may have electrons at the energy level that violet light can eject an electron, but green light can not, the green light will then have no affect on the metal. Make an argument for why spectra are direct evidence for the existence of quantized energy levels in an atom. The spectra shows how different light waves/particles interact with elements, since we know that different lights have different wavelengths and frequencies causing a higher level of energy or a lower level, we can tell which lights will be absorbed and emitted. Compare and contrast absorption, emission, and the photoelectric effect. Describe the role that photons and electrons play in each phenomenon. Absorption and emission can be seen as when the photons are taken in or released back into the system, the photoelectric effect shows the electrons being ejected by the photons. Describe experimental evidence for the wave nature of electrons The double slit experiment produced the results that electrons can create an interference pattern like a wave. Although when observed the electrons behaved like a particle again. Describe an atomic orbital and what it represents An atomic orbital is an area of space surrounding an atom's nucleus where you can find an atom, each orbital can hold 2 electrons. Draw and/or recognize pictures of s and p orbitals S orbitals look spherical in nature and get bigger as the coefficient increases. P orbitals look like a dumbell and also get larger with the coefficient. Describe how the model of the atom changed from