1) Absorption occurs at...

One answer only.

   All wavelengths in the spectrum

   A characteristic wavelength dependent on the molecule

   The UV region

   The visible region

 

HINT

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2) Transmittance is...

One answer only.

   The amount of radiation absorbed by the sample

   The amount of radiation initially divided by the amount of radiation passing through a sample

   The amount of radiation passing through the sample divided by the initial amount

   The wavelength used that promotes an electron

HINT

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3) The Beer-Lambert Law...

One answer only.

   Relates absorbance, concentration, path length and molar absorption coefficient

   Tells us the volume of the sample

   Relates frequency and wavelength

   Allows us to calculate how conjugated the system is

HINT

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4) Conjugated systems tend to absorb in the visible region because...

One answer only.

   electrons are coloured

   overlapping pi orbitals increase the energy gap between orbitals

   overlapping pi orbitals reduce the energy gap between orbitals

   100% transmittance occurs

HINT

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5) What is a chromophore?

One answer only.

   The colour of the molecule *The functional group responsible for colour

   The atom responsible for colour

   A chromium containing compound

HINT

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6) Cone cells detect...

One answer only.

   Lightness

   Darkness

   Colour

   All of the above

HINT

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7) DE is the...

One answer only.

   difference in energy between the HOMO and the LUMO

   The energy of the HOMO

   The energy of the LUMO

   The energy of the HOMO plus the energy of the LUMO.

HINT

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8) UV-Visible spectrometer uses a prism to...

One answer only.

   Focus all wavelengths on the sample simultaneously

   Separate radiation into its constituent wavelengths

   Reduce the amount of radiation passing through the sample

   Stop any radiation going through the sample

HINT