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Measuring Absorbance quiz

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  • What does absorbance represent in UV-Vis spectroscopy?
    Absorbance represents the quantity of light that a sample absorbs.
  • What does percent transmittance represent in UV-Vis spectroscopy?
    Percent transmittance represents the amount of light that passes through a sample.
  • How are absorbance and percent transmittance related?
    They are inversely related; as absorbance increases, percent transmittance decreases.
  • What is the formula for calculating percent transmittance from absorbance?
    Percent transmittance (T) is calculated as 10 to the power of negative absorbance (10^-A).
  • If a sample absorbs 100% of light, what is its percent transmittance?
    Its percent transmittance is 0%.
  • If a sample transmits 100% of light, what is its absorbance?
    Its absorbance is 0.
  • What is the percent transmittance if the absorbance is 0.419?
    The percent transmittance is 38.1%.
  • How do you calculate absorbance if you know the percent transmittance?
    You manipulate the equation to solve for absorbance using the percent transmittance value.
  • What happens to light absorption as the concentration of a sample increases?
    As concentration increases, the sample absorbs more light.
  • What is the relationship between the amount of light absorbed and the amount transmitted?
    They are opposites; more absorption means less transmission and vice versa.
  • If percent transmittance is 39.1%, how would you find the absorbance?
    You use the inverse of the percent transmittance formula to solve for absorbance.
  • Why is understanding the relationship between absorbance and transmittance important?
    It is crucial for analyzing sample concentrations and their light absorption properties.
  • What does it mean if a sample has a high absorbance value?
    It means the sample absorbs a large amount of light and transmits little.
  • What does it mean if a sample has a low absorbance value?
    It means the sample absorbs little light and transmits most of it.
  • How do absorbance and percent transmittance help in UV-Vis spectroscopy analysis?
    They help determine how much light a sample absorbs or transmits, which relates to its concentration.