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Chemistry Multiple choice
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1.   Which form of electromagnetic radiation has the longest wavelengths?

A)

gamma rays

B)

microwaves

C)

radio waves

D)

infrared radiation

E)

x-rays

 

2.   Green light can have a wavelength of 543 nm. The energy of a photon of this light is

A)

1.08 ´ 10–31 J

B)

5.43 ´ 10–7 J

C)

3.66 ´ 10–19 J

D)

5.52 ´ 1014 J

E)

2.73 ´ 1018 J

 

3.   Which one of the following types of radiation has the shortest wavelength, the greatest energy, and the highest frequency?

A)

Ultraviolet radiation.

B)

Infrared radiation.

C)

Visible red light.

D)

Visible blue light.

E)

None, because short wavelength is associated with low energy and low frequency, not high energy and high frequency.

 

Consider the following portion of the energy-level diagram for hydrogen:

 

n = 4

 

–0.1361 ´ 10–18 J

 

n = 3

 

–0.2420 ´ 10–18 J

 

n = 2

 

–0.5445 ´ 10–18 J

 

n = 1

 

–2.178 ´ 10–18 J

 

 

 

 

4.   For which of the following transitions does the light emitted have the longest wavelength?

A)

n = 4 to n = 3

B)

n = 4 to n = 2

C)

n = 4 to n = 1

D)

n = 3 to n = 2

E)

n = 2 to n = 1

 

5.   In the hydrogen spectrum, what is the wavelength of light associated with the n = 3 to n = 1 electron transition?

A)

3.97 ´ 10–25 nm

B)

8.21 ´ 102 nm

C)

9.75 ´ 106 cm

D)

1.94 ´ 10–18 m

E)

1.03 ´ 10–7 m

 

6.   What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from n = 5 to n = 1?

A)

1.05 ´ 107 m

B)

9.50 ´ 10–8 m

C)

2.09 ´ 10–18 m

D)

9.12 ´ 10–8 m

E)

none of these

 

7.   Which of the following statements best describes the Heisenberg uncertainty principle?

A)

The exact position of an electron is always uncertain.

B)

The velocity of a particle can only be estimated.

C)

It is impossible to accurately know both the exact location and momentum of a particle.

D)

The location and momentum of a macroscopic object are not known with certainty.

E)

The location and momentum of a particle can be determined accurately, but not the identity of the particle.

 

8.   Which of the following best describes an orbital?

A)

space where electrons are unlikely to be found in an atom

B)

space which may contain electrons, protons, and/or neutrons

C)

the space in an atom where an electron is most likely to be found

D)

small, walled spheres that contain electrons

E)

a single space within an atom that contains all electrons of that atom

 

 

 

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Chemistry Multiple choice
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