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See this section of the Lux Aeterna (Requiem for a Dream) article on Wikipedia: http://en.wikipedia.org/wiki/Lux_Aeterna_%28Requiem_for_a_Dream%29#Music

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What term is used in forensics to describe a sample of unknown origin?

The term used in forensics to describe a sample of unknown origin is "questioned sample."


How can the calibration curve of absorbance versus concentration be used to determine the concentration of a substance in a sample?

The calibration curve of absorbance versus concentration can be used to determine the concentration of a substance in a sample by measuring the absorbance of the sample and comparing it to the absorbance values on the calibration curve. By finding the corresponding concentration value on the curve, the concentration of the substance in the sample can be determined accurately.


A sample is composed completely of gold absolutely free of impurities Which term or terms could be used to describe this sample?

The sample could be described as pure gold or 100% pure gold.


What criterion is used for the purity of a sample of caffeine?

The purity of a sample of caffeine is often determined by comparing its melting point to the known melting point of pure caffeine. A sample that has a melting point that is close to the expected value is considered pure, while a deviation may indicate impurities in the sample. Additional techniques such as HPLC or spectroscopy can also be used to assess the purity of caffeine samples.


What indications did the experiment results give regarding the purity of the sample used?

The experiment results indicated the purity of the sample by showing how closely the measured properties matched the expected values for the pure substance. Any deviations or impurities detected in the results would suggest a lack of purity in the sample used for the experiment.