Question 1

The scattering of helium atoms by a solid can be used to gain information about the lattice of atoms, provided the wavelength of the helium atoms is comparable to the dimensions of the lattice.What is the wavelength, in picometers, of a helium-4 atom with a kinetic energy of 0.10 eV.(mass of ⁴He = 4.0026 amu; 1 amu = 1.67 * 10^-24 g; 1 eV = 1.602 * 10^-19 J; h = 6.626 * 10^-34 J.s)

Accepted Answer

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Question 2

The colors of the visible spectrum are blue, green, orange, red, violet, and yellow.Of these colors, _______ has the longest wavelength.

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Question 3

What is the wavelength of a ball bearing with a mass of 10.0 g, and a velocity of 10.0 cm/s?

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Question 4

Each shell (principal energy level)of quantum number n contains n subshells

Accepted Answer

This is known as the "n rule" and is a basic principle of the quantum model of the atom. Each subshell can hold a different number of electrons, depending on its shape and orientation within the atom.

Question 5

A neon atom in its ground state will be diamagnetic.

Accepted Answer

Neon has a fully-filled valence electron shell (2s2 2p6), which means that all its electrons are paired up and there is no unpaired electron to create a magnetic field. Therefore, it is diamagnetic.

Question 6

What is the wavelength, in meters, of an alpha particle with a kinetic energy of 8.0 * 10^-13 J.[mass of an alpha particle = 4.00150 amu; 1 amu = 1.67 *10^-27 kg]

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Question 7

The colors of the visible spectrum are blue, green, orange, red, violet, and yellow.Of these colors, ______ has the shortest wavelength.

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Question 8

The bonds of oxygen molecules are broken by sunlight.The minimum energy required to break the oxygen-oxygen bond is 495 kJ/mol. What is the wavelength of sunlight that can cause this bond breakage?

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Question 9

An electron in a 3p orbital could have a value of 2 for its angular momentum quantum number (l).

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Question 10

According to de Broglie's equation, the wavelength associated with the motion of a particle increases as the particle mass decreases.

Accepted Answer

According to de Broglie's equation, the wavelength is inversely proportional to the momentum of the particle, which is equal to its mass times its velocity. So, as the particle mass decreases, its momentum increases and thus its wavelength increases.

Question 11

The frequency of the emitted light from a cesium atom is an intensive property.

Accepted Answer

Intensive properties do not depend on the amount or size of the substance, and the frequency of emitted light from a cesium atom is a characteristic of the atom itself, making it an intensive property.

Question 12

For all atoms of the same element, the 2s orbital is larger than the 1s orbital.

Accepted Answer

This is because the 2s orbital has a higher principal quantum number (n=2) than the 1s orbital (n=1), which means it has a larger radial distance from the nucleus.

Question 13

The Bohr model of the hydrogen atom found its greatest support in experimental work on the photoelectric effect.

Accepted Answer

The Bohr model of the hydrogen atom was supported by its ability to explain the spectral lines of hydrogen, not the photoelectric effect. The photoelectric effect is related to the quantum theory of light and was explained by Einstein.

Question 14

What is the wavelength, in meters, of an alpha particle with a kinetic energy of 8.0 * 10^-13 J.(mass of an alpha particle = 4.00150 amu; 1 amu = 1.67 * 10^-27 kg)

Accepted Answer