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Physical Chemistry
- Consider burning ethane gas, C2H6 in oxygen (combustion) forming CO2 and water. (a) How much energy (in J) is produced in the combustion of one molecule of ethane? (b) What is the energy of a photon of ultraviolet light with a wavelength of 12.6 nm? (c) Compare your answers for (a) and (b).arrow_forwardExplain the physical significance of a negative for delta E. Why must E photon always be positive, while delta E can be negative or positive?arrow_forwardCalculate the energy of a photon of light (in Joules) with a wavelength of (5.40x10^2) nm. Use a value of (3.000x10^8) for the speed of light. Remember 1 m = (1.0000x10^9) nm h = (6.626x10^-34) Js Do not include units with your answer. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answerarrow_forward
- Suppose that the microwave radiation has a wavelength of 12.4 cm. How many photons are required to heat 285 mL of coffee from 25.0 ∘C∘C to 62.0 ∘C∘C? Assume that the coffee has the same density, 0.997 g mL−1, and specific heat capacity, 4.184 J g−1 K−1, as water over this temperature range. Express the number of photons numerically.arrow_forwardThe speed of a certain proton is 0.45 Mm s−1. If the uncertainty in its momentum is to be reduced to 0.0100 per cent, what uncertainty in its location must be tolerated?arrow_forwardImagine an alternate universe where the value of the Planck constant is 6.62607 × 10-12 J.s. In that universe, which of the following objects would require quantum mechanics to describe, that is, would show both particle and wave properties? Which objects would act like everyday objects, and be adequately described by classical mechanics? object A bacterium with a mass of 4.0 pg, 1.0 μm long, moving at 9.00 μm/s. A raindrop with a mass of 4.0 mg, 5.4 mm wide, moving at 8.0 m/s. A ball with a mass of 50. g, 4.0 cm wide, moving at 21.2 m/s. An alpha particle with a mass of 6.6 x 10-27 kg, 8.0 x 10-15 m wide, moving at 12. km/s. quantum or classical? classical O quantum O classical quantum O classical O quantum classical quantumarrow_forward
- Assume that most of the electromagnetic energy from the sun is in the visible region near 500 nm. Calculate the maximum value of the work function for a metal to be used in photovoltaic cells to convert solar energy into electricity. Then identify which of the following metals could be used in such a capacity: tungsten (Φ = 7.20 × 10–19 J) potassium (Φ = 3.78 × 10–19 J) silver (Φ = 7.59 × 10–19 J) silicon (Φ = 7.24 × 10–19 J) barium (Φ = 4.29 × 10–19 J) titanium (Φ = 6.94 × 10–19 J)arrow_forwardGerman physicist Werner Heisenberg related the uncertainty of an object's position (Δx)(Δx) to the uncertainty in its velocity (Δv)(Δv) Δx≥h4πmΔvΔx≥h4πmΔv where hh is Planck's constant and mm is the mass of the object. The mass of an electron is 9.11×10−31 kg.9.11×10−31 kg. What is the uncertainty in the position of an electron moving at 8.00×106 m/s8.00×106 m/s with an uncertainty of Δv=0.01×106 m/s?Δv=0.01×106 m/s? Δx≥Δx≥_______________________________________________________marrow_forwardSuppose that you have a solution containing a substance whose molecules have two quantum states corresponding to different orientations of a certain subgroup of atoms. The energy difference between these two molecular states is ΔE = 0.130 eV. You are running an experiment where no more than 5% percent of the molecules can be in the higher-energy state, or it will cause unacceptable noise. Can you run the experiment at room temperature, or do you need to cool your solution? Decide by determining the percentage of molecules in the higher-energy state. The percentage of molecules in the higher-energy state is_____ %.arrow_forward
- Imagine an alternate universe where the value of the Planck constant is 6.62607 × 10¯18 J.s. In that universe, which of the following objects would require quantum mechanics to describe, that is, would show both particle and wave properties? Which objects would act like everyday objects, and be adequately described by classical mechanics? object quantum or classical? olo classical A mosquito with a mass of 1.9 mg, 7.0 mm long, moving at 2.3 m/s. O quantum O classical A paper airplane with a mass of 4.7 g, 215. mm long, moving at 1.0 m/s. O quantum classical An atom with a mass of 1.0 x 10-27 kg, 124. pm wide, moving at 115. m/s. O quantum O classical A virus with a mass of 6.5 x 10-17 g, 130. nm wide, moving at 1.80 µm/s. O quantum Explanation Checkarrow_forwardImagine an alternate universe where the value of the Planck constant is 6.62607 x 10 - 39 J•s. In that universe, which of the following objects would require quantum mechanics to describe, that is, would show both particle and wave properties? Which objects would act like everyday objects, and be adequately described by classical mechanics? object quantum or classical? O classical A raindrop with a mass of 22.0 mg, 6.4 mm wide, moving at 8.5 m/s. O quantum O classical An iceberg with a mass of 2.5 x 108 kg, 120. wide, moving at 0.73 km/h. O quantum O classical An atom with a mass of 1.0 x 10-27 kg, 185. pm wide, moving at 357. m/s. O quantum O classical A bacterium with a mass of 4.0 pg, 8.0 um long, moving at 2.00 µm/s. O quantumarrow_forwardW 4. (a) A laser emits light that has a frequency of 4.69 X 10¹4 s¹. What is the energy of one photon of this radiation? V (b) If the laser emits a pulse containing 5.0 X 1017 photons of this radiation, what is the total energy of that pulse? (c) If the laser emits 1.3 X 10-2 J of energy during a pulse, how many photons are emitted?arrow_forward
- Chemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning