* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Quiz 1 Key
Molecular Hamiltonian wikipedia , lookup
Particle in a box wikipedia , lookup
Ferromagnetism wikipedia , lookup
Chemical bond wikipedia , lookup
Bremsstrahlung wikipedia , lookup
Molecular orbital wikipedia , lookup
Astronomical spectroscopy wikipedia , lookup
Rutherford backscattering spectrometry wikipedia , lookup
Tight binding wikipedia , lookup
Auger electron spectroscopy wikipedia , lookup
X-ray photoelectron spectroscopy wikipedia , lookup
Matter wave wikipedia , lookup
Electron scattering wikipedia , lookup
Wave–particle duality wikipedia , lookup
Hydrogen atom wikipedia , lookup
X-ray fluorescence wikipedia , lookup
Theoretical and experimental justification for the Schrödinger equation wikipedia , lookup
Atomic orbital wikipedia , lookup
Chemistry 172 Quiz 1 c = 3.00 x 108 m/s h = 6.626 x 10-34 J x s Please circle any numerical answers. 1) J = kg x m2/s2 c 14 Hz. What is 3.00 x 108 m/s 6.40 x 10-7 m 14 -1 4.688 x 10 s Which has the largest frequency, ultraviolet or infrared electromagnetic radiation? ultraviolet 3) E = -2.178 x 10-18J x (Z2/n2) The laser beam used in eye surgery to repair detached retinas has a frequency of 4.688 x 10 the wavelength of this electromagnetic radiation? 2) Name ____Key 10:00 am_____ Dr. Broekemeier infrared Consider an electron moving from orbital n = 2 to n = 5: a) Will energy be emitted or absorbed for this transition? emitted absorbed b) Calculate the actual energy change associated with this transition. 𝛥𝐸 = −2.189 𝑥 10−18 𝐽 1 1 − 2 = 4.57 𝑥 10−19 𝐽 2 5 2 c) What is the wavelength of this emitted light? E h h c Rearrange to = hc 6.626 x 10-34 Js x 3.00 x 108 m/s = = 4.42 x 10-6 m -20 E 4.575 x 10 J 4) The frequency of a wave with wavelength 540 nm is ______the frequency of a wave of wavelength 790 nm. ( greater than equal to less than ) 5) The energy of electromagnetic radiation with a wavelength of 540 nm is _______ the energy of a wavelength of 790 nm. ( greater than equal to less than ) 6) What new idea did the photoelectrical effect suggest? a) electrons have wave properties c) light travels at a constant speed in a vacuum 7) b) electromagnetic radiation has particle properties d) the hydrogen atom has circular orbitals Describe what the emission spectra of a hydrogen atom looks like compared to that of white light and report what this indicated about the energy of the electrons around the hydrogen atom. White light has all of the colors and therefore wavelengths present. The emission spectrum of hydrogen had only certain colors and thus certain wavelengths present. Because wavelength is related to energy, this indicated that there were only certain energies of light emitted. This indicated that there were only defined energy levels for an excited atom and the electrons could only be at certain energy levels. 8) Draw an x,y,z axis and sketch a 3dxy orbital. There should be 4 equal lobes in the x y plane. The lobes should not be on the x y axis, but at a point in the middle. 9) In atoms other than the hydrogen atom, the 2s orbital is at a lower energy than the 2p orbitals. This is because electrons in the 2s orbital can get closer to the nucleus, a phenomena known as ___penetration______. When the 2s electrons get in between the nucleus and the 2p electrons, the 2p electrons are ___shielded____ from the attractive force of the nucleus. 10) l is the ( principal magnetic angular momentum provides information on ( 11) orientation electron spin ) b) 2pz and 3pz c) 3dxy and 3dxz d) 3s and 4s Which of the following is proportional to the probability that an electron can be found at a particular point in space? a) Ψ 13) shape In an atom other than the hydrogen atom, which of the following orbital pairs are degenerate? a) 2px and 2s 12) size angular spin ) quantum number and b) λ c) Ε d) Ψ2 e) Η f) ν What is the electronic configuration of indium (In)? Do not use the shorthand notation employing the noble gas in brackets. 1s22s22p63s23p64s23d104p65s24d105p1 14) How many valence electrons does selenium (Se) have? 6 (those in the 4s and 4p orbitals) 15) How many electrons have the designation ml = -1 in bromine? 7 or 8 Electronic configuration is 1s22s22p63s23p64s23d104p5 There is an ml = 1 when l = 1 and 2 (the p and d orbitals) in this example. There is an ml in 2p, 3p, 3d, and 4p. There are two electrons in each, except potentially the 4 p, which may only have one. 16) Provide a cation and an anion that are isoelectronic with argon. + 2+ 2Common choices: K , Ca , S , Cl