Energy Changes & Atomic Emission Spectra

1. An electron in a calcium atom gains enough energy to move from the first shell to the second shell. The calcium atom becomes

A negative ion

An atom in an excited state

An atom in the ground state

A positive ion

Remember: Absorption (taking it or gaining energy) means an electron in a lower, ground state gains a specific amount of energy (in the form of heat, light, or electricity), which causes it to move to a higher energy state (the excited state).

Explanation

Remember: Absorption (taking it or gaining energy) means an electron in a lower, ground state gains a specific amount of energy (in the form of heat, light, or electricity), which causes it to move to a higher energy state (the excited state).

2. Which statement describes how an atom in the ground state becomes excited?

The atom absorbs energy, and one or more electrons move to a higher electron shell.

The atom absorbs energy, and one or more electrons move to a lower electron shell.

The atom releases energy, and one or more electrons move to a lower electron shell.

The atom releases energy, and one or more electrons move to a higher electron shell.

Electrons become excited by absorbing energy in forms like heat or light.

Explanation

Electrons become excited by absorbing energy in forms like heat or light.

3. The light emitted from a fireworks display is produced when electrons in an excited state

Absorb energy as they move to lower energy states

Release energy as they move to higher energy states

Release energy as they move to lower energy states

Absorb energy as they move to higher energy states

Absorbing energy in forms like heat or light causes electrons to become excited. The opposite occurs during energy emission.

Explanation

Absorbing energy in forms like heat or light causes electrons to become excited. The opposite occurs during energy emission.

4. Which of the following describes how colors in a bright-line spectrum or in a fireworks display are produced?

Ions in salts absorb a specific amount of energy and become excited

Ions in salts absorb a specific amount of energy, moving to a lower energy state as a result

Remember: Colors in a bright-line spectrum or in a fireworks display are produced when electrons emit a specific amount of energy in the form of light with specific wavelengths as the electrons move from higher, excited energy states to lower energy states.

Explanation

Remember: Colors in a bright-line spectrum or in a fireworks display are produced when electrons emit a specific amount of energy in the form of light with specific wavelengths as the electrons move from higher, excited energy states to lower energy states.

5. Based on the bright-line spectra below, identify the two gases present in the mixture. In writing your answer, capitalize the two letters and separate them with a space and a comma. (Ex: X, Y)

See which elements have lines in the exact same spots as the mixture does.

Explanation

See which elements have lines in the exact same spots as the mixture does.

Submit

6. The isotopes C-12 and C-13 have the same

Mass number for their atoms

Bright-line spectrum

Number of neutrons in their atoms

Decay mode

Each element has a specific bright-line spectrum. Isotopes DO NOT change the identity of an element. They are different forms of the same element, so the bright-line spectrum is still the same, even if only the number of neutrons and the mass number change.

Explanation

Each element has a specific bright-line spectrum. Isotopes DO NOT change the identity of an element. They are different forms of the same element, so the bright-line spectrum is still the same, even if only the number of neutrons and the mass number change.

7. A specific amount of energy is emitted when electrons in an aluminum atom return to the ground state. This emitted energy can be used to do what?

To determine the mass of the sample

To determine the identity of the element

To determine the number of moles of the element

To determine the number of electrons, ONLY, and NOTHING ELSE

Remember: Colors in a bright-line spectrum or in a fireworks display are produced when electrons emit a specific amount of energy in the form of light with specific wavelengths as the electrons move from higher, excited energy states to lower energy states. These wavelengths and specific emitted energies can be used to determine the identity of the element itself.

Explanation

Remember: Colors in a bright-line spectrum or in a fireworks display are produced when electrons emit a specific amount of energy in the form of light with specific wavelengths as the electrons move from higher, excited energy states to lower energy states. These wavelengths and specific emitted energies can be used to determine the identity of the element itself.