Chemistry Archive: Questions from 2024-03-15

If an electron in a Hydrogen atom transitions from n = 4 to n = 1, what will be the wavelength of the resulting photon emitted? Use RH = 2.18 × 10 −18 J for the hydrogen atom Rydberg constant. Use h = 6.626 × 10 −34 J s for Planck's constant. Use c = 2.998 × 10 8 m s for the speed of light. Report your answer in scientific notation. Use the multiplication symbol rather than the letter x in your answer. Your answer should have three significant figures.

What is the energy of an electron in a helium ion (He+) in an energy level of n = 4? Use 2.18 × 10 −18 J for the Rydberg constant in joules (sometimes labeled Ry, R∞, or k). Report your answer in scientific notation. Your answer should be reported to three significant figures. Provide your answer below: J

Calculate the change of energy for an electron within a hydrogen atom that undergoes a transition from n = 3 to n = 4. Use RH = 2.18 × 10 −18 J for the Rydberg constant. Report your answer in scientific notation. Use the multiplication symbol rather than the letter x in your answer. Your answer should have three significant figures. Provide your answer below: J

What is the energy of the electron in a helium ion with a charge of +1 in an orbit with a value of n = 4? Use k = 2.18 × 10 −18 J. Report your answer with three significant figures. Provide your answer below: J

What will be the wavelength of a photon that is emitted when an electron of a hydrogen atom undergoes a transition from n = 7 to n = 4? RH = −2.18 × 10 −18 J h = 6.626 × 10 −34 J s c = 2.998 × 10 8 m s Report your answer in scientific notation. Use the multiplication symbol rather than the letter x in your answer. Your answer should have three significant figures. Provide your answer below: m

What is the wavelength of a proton traveling at 3.00 × 10 5 m s if its mass is 1.673 × 10 −27 kg? Select the correct answer below: 1.51 × 10 −16 m 1.32 × 10 −12 m 3.96 × 10 −7 m 1.93 × 10 −14 m

What is the wavelength of an electron with a mass of 9.109 × 10 −31 kg and a velocity of 8.12 × 10 6 m s? Use 6.626 × 10 −34 kg m2 s for Planck's constant. Your answer should include three significant figures. Provide your answer below: m

If the uncertainty associated with the position of an electron is 10 −10 m, what will the uncertainty associated with its momentum must be? Use ℏ = 1.055 × 10 −34 kg m2 s. Select the correct answer below: 3.9 × 10 −24 kg m s 1.7 × 10 −24 kg m s 5.3 × 10 −25 kg m s 7.8 × 10 −25 kg m s