1.In Experiment 1, where was the peak absorbance for the yellow dye? 420 mm 420 nm 500 mm 500 nm 2.Where was the peak absorbance for the red dye?

1.In Experiment 1, where was the peak absorbance for the yellow dye?

1. 420 mm
2. 420 nm
3. 500 mm
4. 500 nm

2.Where was the peak absorbance for the red dye?

1. 500 nm
2. 420 mm
3. 500 mm
4. 420 nm

3.Where was the peak absorbance for the blue dye?

1. 640 nm
2. 640 mm
3. 500 mm
4. 500 nm

4.At the peak absorbance for the yellow dye, which of the following statements is true?

1. There was also moderate (>10%) absorbance of the blue dye at this wavelength.
2. There was also moderate (>10%) absorbance of the red dye at this wavelength.
3. The absorbance of all three dyes was equal at this wavelength.
4. There absorbance peaks of all of the dyes were well separated without any overlap.

5.What color was the wavelength of peak absorbance of the blue dye?

1. red
2. purple
3. yellow
4. blue

6.What color was the wavelength of peak absorbance of the yellow dye?

1. yellow
2. green
3. red
4. purple-blue

7.What color was the wavelength of peak absorbance of the red dye?

1. red
2. yellow-orange
3. blue-green
4. purple

8.In Experiment 2, what was the absorbance of the Yellow 5 dye in cuvette 1 at lambda max?

1. 0.55
2. 0.37
3. 0.49
4. 0.12

9.What was the absorbance of the Yellow 5 dye in cuvette 2 at lambda max?

1. 0.55
2. 0.49
3. 0.12
4. 0.37

10.What was the absorbance of the Yellow 5 dye in cuvette 3 at lambda max?

1. 0.25
2. 0.55
3. 0.12
4. 0.37

11.What was the absorbance of the Yellow 5 dye in cuvette 4 at lambda max?

1. 0.49
2. 0.37
3. 0.25
4. 0.12

12.What was the concentration of the food dyes in cuvette 1? You can use the dilution formula below.

C1V1 = C2V2

1. 0.020 mM
2. 0.20 mM
3. 0.010 mM
4. 0.0050 mM

13.What was the concentration of the food dyes in cuvette 2? You can use the dilution formula below.

C1V1 = C2V2

1. 0.20 mM
2. 0.0050 mM
3. 0.020 mM
4. 0.015 mM

14.What was the concentration of the food dyes in cuvette 3? You can use the dilution formula below.

C1V1 = C2V2

1. 0.020 mM
2. 0.0050 mM
3. 0.20 mM
4. 0.010 mM

15.What was the concentration of the food dyes in cuvette 4? You can use the dilution formula below.

C1V1 = C2V2

1. 0.010 mM
2. 0.020 mM
3. 0.0050 mM
4. 0.20 mM

16.In Experiment 3, what was the absorbance of the drink mix at the lamba max wavelength for the yellow dye? Choose the closest answer.

1. 1.28
2. 0.35
3. 0.84
4. 0.06

17.What was the absorbance of the drink mix at the lamba max wavelength for the red dye? Choose the closest answer.

1. 0.73
2. 0.01
3. 1.12
4. 0.25

18.Given that the molar mass of the Yellow 5 dye is equal to 534.36 g/mol, how many grams of Yellow 5 food dye were in the 0.235 L solution of drink mix? Remember that you diluted your original solution ten fold before measuring its absorbance. Choose the closest answer.

1. 0.0075 g
2. 0.0050 g
3. 0.018 g
4. 0.0018 g

19.Given that the molar mass of the Red 40 dye is equal to 496.42 g/mol, how many grams of Red 40 food dye were in the 0.235 L solution of drink mix? Remember that you diluted your original solution ten fold before measuring its absorbance. Choose the closest answer.

1. 0.0045 g
2. 0.011 g
3. 0.0011 g
4. 0.085 g

20.What is the mass percent of the Yellow 5 food dye in the orange powder? % mass = (mass of dye / mass of powder) x 100 

1. 12%
2. 2.2%
3. 0.36%
4. 0.036%

21.What is the mass percent of the Red 40 food dye in the orange powder? % mass = (mass of dye / mass of powder) x 100  

1. 0.22%
2. 0.022%
3. 1.8%
4. 0.061%

22.The observation that the absorbance is directly proportional to the concentration of dye is a statement of which law?

1. Beer's Law
2. Boyle's Law
3. Dalton's Law
4. Avogadro's Law

23.Given the peak absorbance wavelength of the Blue 1 dye, which of the following statements is true?

1. The peak absorbance occurs at a wavelength that is different from the color that is perceived because we see the wavelengths that are reflected.
2. The peak absorbance wavelength is the same as the wavelength that we see because we see the wavelengths that are absorbed by the sample.
3. The peak absorbance wavelength is the same as the wavelength that we see because we see the wavelengths that are reflected.
4. The peak absorbance occurs at a wavelength that is different from the color that is perceived in the eye because we see the wavelengths that are absorbed by the sample.

24.Below is a graph of the absorbance of the yellow dye at the peak absorbance wavelength as a function of the concentration of the yellow dye. What is the observed relationship between the absorbance and the concentration? 

1. Linear, with the absorbance increasing as a function of concentration.
2. Linear, with the absorbance decreasing as a function of concentration.
3. Hyperbolic, with the absorbance increasing as a function of concentration.
4. The absorbance is independent of the concentration.