# Chemistry problem by answer

**Exercise 7.40: Problems by Topic – Electromagnetic Radiation**

**Part A **

List the following types of electromagnetic radiation in order of increasing frequency.

ANSWER:

[removed]radio waves, microwaves, visible light, gamma rays |

[removed]radio waves, visible light, microwaves, gamma rays |

[removed]visible light, radio waves, microwaves, gamma rays |

[removed]visible light, radio waves, gamma rays, microwaves |

Correct

**Part B **

List the following types of electromagnetic radiation in order of decreasing energy per photon.

ANSWER:

[removed]microwaves, visible light, gamma rays, radio waves |

[removed]microwaves, gamma rays, visible light, radio waves |

[removed]gamma rays, visible light, microwaves, radio waves |

[removed]gamma rays, microwaves, visible light, radio waves |

Correct

**Exercise 7.56: Problems by Topic – Orbitals and Quantum Numbers**

**Part A **

Which electron is, on average, further from the nucleus: an electron in a 3*p* orbital or an electron in a 4*p* orbital?

ANSWER:

[removed]3p |

[removed]4p |

Correct

**Exercise 7.59: Problems by Topic – Orbitals and Quantum Numbers**

**Part A **

Which set of quantum numbers *cannot* occur together to specify an orbital?

ANSWER:

[removed]n=2,l=0,ml=0 |

[removed]n=3,l=3,ml=2 |

[removed]n=4,l=2,ml=0 |

[removed]n=3,l=1,ml=−1 |

Correct

**Exercise 7.60: Problems by Topic – Orbitals and Quantum Numbers**

**Part A **

Which of the following combinations of *n* and *l* represent real orbitals and which are impossible?

Drag the appropriate items to their respective bins.

ANSWER:

**Exercise 7.64: Problems by Topic – Atomic Spectroscopy**

Determine whether each of the following transitions in the hydrogen atom corresponds to absorption or emission of energy.

**Part A **

*n*=3→*n*=1

ANSWER:

[removed]absorption of energy |

[removed]emission of energy |

Correct

**Part B **

*n*=2→*n*=4

ANSWER:

[removed]absorption of energy |

[removed]emission of energy |

Correct

**Part C **

*n*=4→*n*=3

ANSWER:

[removed]absorption of energy |

[removed]emission of energy |

Correct

**Exercise 7.79: Cumulative Problems**

Suppose that in an alternate universe, the possible values of *l* were the integer values from 0 to *n* (instead of 0 to *n*−1). Assuming no other differences from this universe, how many orbitals would exist in each of the following levels?

**Part A **

*n* = 1

ANSWER:

**Part B **

*n* = 2

ANSWER:

**Part C **

*n* = 4

ANSWER:

**Exercise 7.65: Problems by Topic – Atomic Spectroscopy**

**Part A **

According to the quantum-mechanical model for the hydrogen atom, which of the following electron transitions would produce light with the longer wavelength: 2*p*→1*s* or 3*p*→1*s*?

ANSWER:

[removed]2p→1s |

[removed]3p→1s |

Correct

**Exercise 7.55: Problems by Topic – Orbitals and Quantum Numbers**

**Part A **

Which electron is, on average, closer to the nucleus: an electron in a 2*s* orbital or an electron in a 3*s* orbital?

ANSWER:

[removed]an electron in a 2s orbital |

[removed]an electron in a 3s orbital |

Correct

**Exercise 7.41: Problems by Topic – Electromagnetic Radiation**

Calculate the frequency of each of the following wave lengths of electromagnetic radiation.

**Part A **

488.0 nm (wavelength of argon laser)

Express your answer using four significant figures.

ANSWER:

**Part B **

503.0 nm (wavelength of maximum solar radiation)

Express your answer using four significant figures.

ANSWER:

**Part C **

337.1 nm (wavelength of nitrogen laser)

Express your answer using four significant figures.

ANSWER:

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