Qwuiz

Which law states that absorbance is directly proportional to concentration?

• Charles’s Law

• Beer’s Law

• Bear’s Law

• Bir’s Law

Which component of a spectrophotometer isolates specific wavelengths of light?

• Cuvette

• Photodetector

• Monochromator

• Readout system

Which of the following is a disadvantage of visual colorimetry?

• High accuracy

• Subjective (depends on human eye)

• Measures infrared light

• Uses complex detectors

What is the purpose of the "blank" in spectrophotometry?

• To account for solvent/cuvette absorption and set 100% transmittance

• To increase sample concentration

• To cool the light source

• To calibrate the wavelength

What does Beer’s Law describe?

• The relationship between light intensity and temperature

• The reflection of light by colored solutions

• The inverse relationship between wavelength and energy

• The direct proportionality between absorbance and concentration

What is the primary principle of Atomic Emission Spectrometry (AES)?

• Scattering of light by molecules.

• Measurement of absorbed light by atoms.

• Emission of light when excited atoms return to ground state.

• Reflection of light by solid samples.

What happens to atoms in the excitation source of an AES instrument?

• They absorb energy and move to higher energy states

• They form covalent bonds

• They lose electrons completely

• They become radioactive

Which of the following is a common excitation source in AES?

• Tungsten lamp

• Deuterium lamp

• Inductively Coupled Plasma (ICP)

• UV-Vis light source