Chemistry ( Quantum Theory and the Atom ) lesson 1

Front

What is Bohr's model of the atom?

Back

Bohr's model describes the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus, similar to planets around the sun.

Front

What does the letter 'm' represent in the de Broglie equation?

Back

Mass.

Front

What series of spectral lines is formed when electrons drop to n=2?

Back

Balmer series.

Front

How can we calculate the energy of a photon?

Back

The energy of a photon can be calculated using the formula: E = hν, where E is energy, h is Planck's constant, and ν is the frequency of the photon.

Front

What is an excited state of an atom?

Back

An excited state occurs when an atom absorbs energy and one or more of its electrons move to a higher energy level.

Front

What is Planck's constant?

Back

Planck's constant (h) is a fundamental constant used in quantum mechanics, approximately equal to 6.626 x 10^-34 Js.

Front

What is the significance of the quantum number 'n'?

Back

The quantum number 'n' indicates the principal energy level of an electron in an atom, determining its energy and distance from the nucleus.

Front

What is the photoelectric effect?

Back

The photoelectric effect is the phenomenon where electrons are emitted from a material when it absorbs light of sufficient frequency.

Front

What is the relationship between wavelength and frequency?

Back

Wavelength (λ) and frequency (ν) are inversely related; as wavelength increases, frequency decreases, and vice versa, described by the equation c = λν, where c is the speed of light.

Front

What is the uncertainty principle?

Back

The uncertainty principle, formulated by Heisenberg, states that it is impossible to simultaneously know both the exact position and momentum of a particle.