C125 EXAM REVIEW QUESTIONS WITH CORRECT ANSWERS

C125 EXAM REVIEW QUESTIONS WITH CORRECT ANSWERS Red and purple are two lines of hydrogen lamp. Which one is correct when comparing these two lines? - Answer- -Red line has smaller energy than the purple one -Red line has longer wavelength than the purple one According to Bohr's Model, which one is correct about a transition from n=2 to n=1 in a hydrogen atom? - Answer- It is a transition from an excited state to a ground state The lines observed in H-lamp are parts of Balmer Series. All these lines are due to a transition from various higher n value to a common n. What is this common lower n value for all these lines? - Answer- 2 (T/F) Since we can only see visible lines from a hydrogen lamp, hydrogen lamp does not produce any UV light. - Answer- False The lines on Absorption Atomic Spectra correspond to energies needed for electrons to be excited from a lower energy level to a higher energy level. Assume that the energy needed for an electron in 2p orbital in an O atom to jump to 3s orbital is 3.6*10-19 J, what is its wavelength of the line atomic spectra in nanometer (nm)? - Answer- 553 Given: In Atomic Spectra lab, a student obtained his best-fit line equation to be y = 0.29 x + 46.8 when he plotted his Vernier reading on the y-axis and wavelength in nm on the x-axis. - Answer- 584.1 The only electron in a hydrogen atom moved from n=3 to n=5. What is the wavelength of photon (in nm) being associated with this transition? - Answer- 1283 Which of the following transitions in a hydrogen atom will absorb the highest amount of energy? - Answer- n=1 to n=2 A student obtained the Rydberg constant to be 2.14*10-18 J. What is the % error of the measurement? . - Answer- 1.8 Which of the following orbitals of oxygen has the highest energy? 3d, 3p, 2s, 4s - Answer- 3d