The options for question 4 are.. Thanks for your help! Food and drink that has b
ID: 904582 • Letter: T
Question
The options for question 4 are..
Thanks for your help! Food and drink that has been used in laboratory experiments should be consumed Oinside the laboratory. O outside the laboratory never QUESTION 2 Question Completion Status: The purpose of a spectrophotometer is to measure the aegree absorbed radiation by matter O True O False QUESTION 3 2 points Save Answer The spectrophotometer will measure the transmitted light intensities with a photosensitive detector at specific visible wavelegths O True False QUESTION 4 10 points Save Answer The correct order of the pathway of light in a spectrophotometer and QUESTION 5 3 points Save Answer Which of the following are correct statement(s) of the Beer- Lambert Law? (There may be one or more answer(s).) O It is against the law to drink beer at Lambert St. Louis International Airport. O Absorbance values of a solution are inversely proportional to its concentration. A = abc O Absorbance values of a solution are directly proportional to its concentration.
Explanation / Answer
Question 1
Food and drink that are used in the laboratory should not be consumed as it has the chance of getting contaminated with harmful chemicals, microorganisms. Hence it is never advised to consume.
The answer for question 1 is never
Question 2
The answer is true. The spectrophotometer absorbs the radiation which is measured by the spectrophotometer but it also measures the transmitted light when we change the measurement of absorbance to transmittance
Question 3
The answer is false
Question 4
The order is 1. Light source - Usually a deuterium or hydrogen lamp 2. Monochromator - It is usually a prism that is useful to select the particular wavelength 3. Wavelength 4. Sample - through which light passes 5. Absorption 6. Detector 7. Output - where the signals are shown as absorbance or transmittance
Question 5
The answer is absorbance values of a solution are directly proportional to concentration. When a concentration increases the absorbance also increases
Question 6
The deep red is due to anthocyanins
Question 7
It is the wavelength corresponding to the maximum absorbance on your graph of absorbance Vs wavelength. Each sample or colour has a maximum absorbance at particular wavelength that is called as lambda max
Question 8
A = 1.58c - 0.03
Absorbance of the solution = 0.37
A = 0.37 substituting it we get
0.37 = 1.58c - 0.03
where c is the concentration
Therefore c = (0.37+0.03)/1.58
c = 0.253