Exam 9: Chemical Reactions

The element named ______________ was detected spectroscopically on the Sun before it was found on Earth.

If the energy of n = 6 is -0.378 eV and that of n = 4 is -0.850 eV in a hydrogen atom, a transition from n = 6 to n = 4 will emit a photon of what energy?

Addition of an electron to an atom gives a

The quantity h in the Bohr theory is called ______________.

Calculate the de Broglie wavelength of a 0.145-kg baseball moving at a speed of 45.2 m/s.

Bohr's revolutionary step in his theory was to ______________ the angular momentum of the electron.

According to the hypothesis of de Broglie, any moving particle has

The dilemma known as the ultraviolet catastrophe was resolved in 1900 by

Both line emission and line ______________ spectra are characteristic for a specific element.

In the Bohr model, the higher the value of n, the farther from the nucleus the electron is located. In the quantum model, the higher the value of n, the farther from the nucleus the electron ______________ is located.

The energy of the electron in the hydrogen atom has only certain ______________ values.

Another name for quantum mechanics is ______________ mechanics.

In both the Bohr model and the Schrِdinger model of the atom, the letter n is called the ______________.

In terms of a combination of three other symbols, the wavelength ( $\lambda$ ) of a moving particle is equal to ______________.

Theoretical limits on measurement accuracy are set by a principle associated with which scientist?

Calculate the de Broglie wavelength for an electron (m = 1 $\times$ 10^-30 kg) moving at 2.4 $\times$ 10⁶ m/s.

In the electron cloud model, or quantum model, of the atom, the focus is on the ______________ nature of the electron.

Calculate the de Broglie wavelength for an electron (m = 1 $\times$ 10^-30 kg) moving at 3.3 $\times$ 10⁶ m/s.

The nucleus of an ordinary hydrogen atom consists of a(n) ______________.

The removal of an electron from an atom is called