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Physics Quiz: Light Absorption and Energy

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Physics Quiz: Light Absorption and Energy

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Questions and Answers

What is the main goal of the student in the experiment?

To measure the wavelength of the spectrophotometer

To calculate the absorbance of the CuSO4 solution

To determine the solubility of the impurity

To determine the concentration of CuSO4 in the solution (correct)

What is the purpose of the calibration graph in the experiment?

To calculate the mass of the sample

To determine the wavelength of the spectrophotometer

To measure the concentration of the impurity

To establish a relationship between absorbance and concentration of CuSO4 (correct)

What is the effect of the accidental change in wavelength setting from 280nm to 300nm on the experiment?

It would not affect the experiment

It would increase the absorbance of the CuSO4 solution

It would change the concentration of the CuSO4 solution

It would decrease the accuracy of the calibration graph (correct)

What is the unit of the concentration of the CuSO4 solution in the experiment?

Moles per liter Signup and view all the answers

What is the value of the absorbance of the CuSO4 solution measured by the student?

0.30 Signup and view all the answers

What is the concentration of the CuSO4 solution in the experiment?

0.15M Signup and view all the answers

What is the number of moles of CuSO4 in the impure sample of CuSO4(s)?

0.015 mol Signup and view all the answers

What is the additional quantity that must be measured to calculate the mass percentage of CuSO4 in the impure sample of CuSO4(s)?

The mass of the sample Signup and view all the answers

What is the relationship between the absorbance and concentration of CuSO4 in the experiment?

The absorbance is directly proportional to the concentration of CuSO4 Signup and view all the answers

What is the principle behind the spectrophotometer used in the experiment?

The Beer-Lambert law Signup and view all the answers