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e1pf09key

# e1pf09key - 1 If the average bond energy for the C-H bond...

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1. If the average bond energy for the C-H bond in methane is 435 kJ/mol. What frequency of light is needed to break the bond? a. 6.67 e35 Hz b. 1.09 e15 Hz c. 6.57 e38 Hz d. 1.09 e12 Hz ((435000 J/mol)*(1 mol/6.022 e23 photons))/(6.626 e-34 J*) = 1.09 e15 Hz 2. Which of the following statements is incorrect? temperature of the body increases. the incident radiation increases. 3. If an electron falls to the energy level n=1, and an emission spectrum was observed at 102.3 nm, what energy level did it fall from? n= c/ λ = v (3 e8 m/s)/102.3 e-9 m = 2.93 e15 Hz v = R (1/nl^2 - 1/nu^2) nu = (1/nl^2 - v/R)^(-1/2) nu = (1/1^2 - 2.93 e15 Hz/3.3 e15 Hz)^(-1/2) = 3 4. If a particle is in a one-dimensional box of length 200 cm and is in its fourth energy level, at which of the following positions is the particle least likely to be found? The fourth energy level will have nodes at 50, 100 and 150 cm. 5. If the uncertainty in the position of a particle is 2.4 cm, what is the minimum uncertainty in the particles momentum? a. 2.2 e-35 m/s b. 4.4 e-33 m/s c. 2.2 e-33 m/s d. 4.4 e-35 m/s Δ p Δ x > /2 Δ p > /(2*Δ x) Δ p > (1.05 e-34 Js)/(2*.024 m) = 2.2 e-33 m/s 6. What is the wavelength of a particle with a momentum of 745 kg*m/s? λ = h/(mv) = h/p = 6.626 e-34 Js/745 kg*m/s = 8.89 e-37 m

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