PRELAB QUESTIONS 87 osle 1O 7 Characterizing Elements 1. Name the six colors of

Question

PRELAB QUESTIONS 87 osle 1O 7 Characterizing Elements 1. Name the six colors of visible light, starting with the lowest wavelength. 2. Distinguish between absorption and emission of energy. 3. Do different elements have distinct atomic emission spectra? Why? The only line emissions detectable by the human eye for hydrogen correspond to transitions for ele trons dropping from higher energy levels down to n 2. Why? 4. 5. Electromagnetic radiation is a form of energy True False 6. Each specific wavelength of electromagnetic radiation has only one frequency corresponding to it. True False

Explanation / Answer

1) In ascending order:

Violet (380-427 nm) Blue (427-476 nm) Cyan (476-497 nm) Green (497-570 nm) Yellow (570-581 nm) Orange (581-618 nm) Red (618-780 nm) 2) Absorption: if you send an atom of light (of the appropriate wavelength) to an atom, it is capable of absorbing it and promoting an electron to an "excited state". Emission: once excited the electron can return to its ground state, but for this it emits the same light that it has absorbed before. Either way, promoting the electron to the excited state can be done by light or by any other form of energy (usually heat), so when something is heated it begins to emit light. 3) The atomic emission spectrum of an element is a set of frequencies of the electromagnetic waves emitted by atoms of that element, in a gaseous state, when energy is communicated to it. The emission spectrum of each element is unique and can be used to determine if that element is part of an unknown compound. 4) The corresponding lines that are observed in the visible spectrum of hydrogen are called the Balmer series. They are the only ones that emit radiation within the spectrum of light visible by the human eye. 5) TRUE: Electromagnetic radiation is a type of variable electromagnetic field, that is, a combination of oscillating electric and magnetic fields that propagate through space, transporting energy from one place to another. 6) TRUE: The wavelength (?) is inversely proportional to the frequency (f). The length is the distance that the wave travels. The frequency is the number of waves that pass in the unit of time. The longer the wavelength, the lower the frequency.

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