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Chemistry

Atomic Structures Practice Problems

2015-10-27

www.njctl.org

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1 According to Einstein’s view of matter and energy, what is the common link between light and matter?

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2 What is Chemistry?

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3 How does diffraction effect the double slit experiment?

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4 The wavelength of light emitted from a traffic light having a frequency of 6.15x10 14 Hz is _________.

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5 An electromagnetic wave has a frequency of 6x 105 Hz. What is the wavelength?

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6 An electromagnetic wave has a wavelength of 5x10-13 m. What is the frequency?

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7 An electromagnetic wave has a frequency of 9x10 -7 Hz. What is the wavelength?

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8 What is the frequency of yellow sodium light that has a wavelength of 579nm?

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9 Electromagnetic radiation with a wavelength of ________ nm appears as green light to the human eye. The frequency of this light is 5.71x10 14 Hz.

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10 Explain Newton’s original ideas about the nature of light.

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11 While standing in a room with two speakers (speakers A and B), each emitting sound with a wavelength of 2m, you notice you cannot hear the sound. Compared to the closer speaker, what’s the smallest difference in distance to the further speaker (ignore reflection of sound off of walls etc).

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12 While standing in a room with two speakers (speakers A and B) centered about the center of the room, pointed at the wall. You notice you cannot hear the sound while standing 1 meter from the center of the far wall. What’s the next distance from the center you could stand at that would you to hear the sound at its loudest?

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13 How are matter and energy related?

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14 Why is the understanding of energy and matter vital to one’s understanding of Chemistry?

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15 How does interference effect the double slit experiment?

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16 A radio station broadcasts at 101.5 MHz. The wavelength of the signal is __________ m.

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17 An electromagnetic wave has a wavelength of 1.5 nm. What is the frequency?

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18 An electromagnetic wave has a wavelength of 5x10-13 m. What is the frequency?

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19 An electromagnetic wave has a wavelength of 300 m. What is the frequency?

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20 What is the frequency of orange lithium light that has a wavelength of 650nm?

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21 An FM radio station broadcasts electromagnetic radiation at a frequency of 99.5 MHz. The wavelength of this radiation is __________ m.

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22 What is the frequency, in Hz, of electromagnetic radiation that has a wavelength of 0.55 m?

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23 What is the frequency of light, in Hz, that has a wavelength of 1.23x10 -6 cm?

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24 What is the wavelength of light (nm) that has a frequency of 3.22x1014 Hz?

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25 What is the wavelength of light (nm) that has a frequency 4.25x1014 Hz?

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26 Explains Hyugen’s original ideas about the nature of light.

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27 How are the properties of fluids in a tank, sound from a set of speakers, and light passing through a double slit all related to one another?

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28 While standing in a room with two speakers (speakers A and B) centered about the center of the room, pointed at the wall. You notice you cannot hear the sound while standing 1 meter from the center of the far wall. What’s the next distance from the center you could stand at that would still prevent you from hearing the sound.

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29 What is the energy of a photon that has a frequency of 7.0 x 1015 Hz?

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30 What is the energy of a photon that has a frequency of 4.5 x 1015 Hz?

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31 What is the energy of a photon that has a wavelength of 720 nm?

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32 Electromagnetic radiation with a wavelength of 531 nm appears as green light to the human eye. The energy of one photon of this light is 3.74 x10 -19 J. Thus, a laser that emits 2.3 x10 -2 J of energy in a pulse of light at this wavelength produces __________ photons in each pulse.

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33 The wavelength of a photon that has energy of 5.65 x 10 -19 J is __________ nm.

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34 What is the frequency (Hz) of a photon that has energy of 4.38 x 10 -18 J?

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35 The energy of a photon that has a frequency of 7.75 x 1014 Hz is __________ J.

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36 What is the energy of a photon that has a wavelength of 450 nm?

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37 Electromagnetic radiation with a wavelength of 525 nm appears as green light to the human eye. The energy of one photon of this light is __________ J.

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38 The energy of a photon that has a wavelength of 10.0 m is __________ J

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39 What implication does the equation ρ=h/λ have on how we view matter or anything with momentum.

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40 What is the wavelength of an electron which has a velocity of 3.5 x 107 m/s? (me = 9.11x10-31 kg)

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41 The de Broglie wavelength of a 12.0 gram bullet traveling at the speed of sound is _________ m. The speed of sound is 331 m/sec.

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42 The de Broglie wavelength of an electron with a velocity of 6.00 x10 6 m/s is __________ m. (me = 9.11x10-31 kg)

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43 What is the wavelength of an electron which has a velocity of 6.0 x 107 m/s? (me = 9.11x10-31 kg)

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44 Why would the dual nature of matter make it difficult to observe very small particles like electrons?

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45 What is the wavelength of an electron which has a velocity of 1.2 x 108 m/s? (me = 9.11x10-31 kg)

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46 The de Broglie wavelength of a 10.0 gram whip traveling at the speed of sound is _________ m. The speed of sound is 331 m/sec.

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47 The de Broglie wavelength of an electron with a velocity of 1.30 x10 7 m/s is __________ m. (me = 9.11x10-31 kg)

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48 What is the wavelength of an electron which has a velocity of 4.0 x 107 m/s? (me = 9.11x10-31 kg)

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49 Why do neutral atoms have the same numbers of protons and electrons?

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50 What about electrons allow them to be some of the fastest traveling sub atomic particles?

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51 Why was it important to use alpha particles in order to discover the neucleus, as opposed to gamma rays or beta particles?

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52 Based on Bohr’s model of the atom, why do you think electrons were the first subatomic particle to be discovered?

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53 Based off of the first experiments into the composition of atoms, why were neutrons the last particles to be discovered?

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54 As more and more protons enter the nucleus of an atom, increasing ratios of neutrons are needed. Why do you think this is?

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55 Why is it not possible for an electron to continue in a set orbit around the nucleus like a planet around the sun?

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56 Explain how emission spectra of gasses helped scientists to determine electrons traveled in energy levels.

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57 Give one example of black body radiation that you see in your everyday life.

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58 The binding energy of the hydrogen atom in its ground state is -13.6 eV. What is the energy when it is in the n = 4 state?

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59 What is the energy of the second excited state (n=3) of hydrogen?

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60 What is the energy of the ground state (n=1) of hydrogen?

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61 How much energy does an electron in hydrogen need as it jumps from ground state to the second excited state?

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62 If an electron returns from the second excited state to ground state, what 3 Energies of photons could it emit?

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63 If an electron returns from the second excited state to ground state, what 3 frequencies of photons could it emit?

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64 A Hydrogen electron drops from its sixth excited state back down to its forth excited state. A What are the n values associated with these two

states?B How many different types of photons can it emit?

C What is change in energy (in eV) associated with each transition?

D What is the frequency associated with each of the emitted electrons?

E What is the wavelength associated with each of the emitted electrons?

F What possible types of electromagnetic radiation are given off during this transition?

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65 The wavelength of a ruby laser is 694.3 nm. What is the energy difference (in eV) between the two energy states involved in laser action?

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66 In state n = 1, the energy of the hydrogen atom is -13.58 eV. What is its energy in state n = 2?

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67 If an electron returns from the second excited state to ground state, what 3 wavelengths (in nm) of photons could it emit?

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68 If an electron returns from the second excited state to ground state, what 3 types of EM Radiation could it emit (if visible light is emitted, include the color)?

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69 The electron of a hydrogen atom makes a transition from the n = 5 state to the n = 2 state. What is the wavelength of the emitted photon?

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70 A Hydrogen electron drops from its forth excited state back down to its first excited state. A What are the n values associated with these

two states?

B How many different types of photons can it emit?

C What is change in energy (in eV) associated with each transition?

D What is the frequency associated with each of the emitted electrons?

E What is the wavelength associated with each of the emitted electrons?

F What possible types of electromagnetic radiation are given off during this transition?