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Calculate and use Rf values in chromatography

9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS1-3, NGSS.SEP 5 · England: GCSE Combined Science: Chemical analysis (required practical: chromatography)

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  1. Question 1

    Reference Rf values in the same solvent: dye A 0.15, dye B 0.35, dye C 0.55, dye D 0.8. An unknown ink gives one spot that moves 1.75 cm when the solvent moves 5 cm. Which dye is it?

    • A. dye C
    • B. dye D
    • C. dye A
    • D. dye B

  2. Question 2

    On a chromatogram the solvent front moved 12 cm from the start line and a spot moved 6.3 cm. What is the Rf value of the spot? Give 2 decimal places.

    Answer

  3. Question 3

    A dye has an Rf value of 0.5 in water. If the solvent front moves 6 cm, how far will the dye move, in cm?

    Answercm

  4. Question 4

    Reference Rf values in the same solvent: dye A 0.15, dye B 0.35, dye C 0.55, dye D 0.8. An unknown ink gives one spot that moves 2.75 cm when the solvent moves 5 cm. Which dye is it?

    • A. dye B
    • B. dye C
    • C. dye D
    • D. dye A

  5. Question 5

    On a chromatogram the solvent front moved 12 cm from the start line and a spot moved 4.2 cm. What is the Rf value of the spot? Give 2 decimal places.

    Answer

  6. Question 6

    A dye has an Rf value of 0.45 in water. If the solvent front moves 12 cm, how far will the dye move, in cm?

    Answercm

  7. Question 7

    Reference Rf values in the same solvent: dye A 0.15, dye B 0.35, dye C 0.55, dye D 0.8. An unknown ink gives one spot that moves 7 cm when the solvent moves 20 cm. Which dye is it?

    • A. dye B
    • B. dye D
    • C. dye C
    • D. dye A

  8. Question 8

    On a chromatogram the solvent front moved 10 cm from the start line and a spot moved 8.8 cm. What is the Rf value of the spot? Give 2 decimal places.

    Answer

  9. Question 9

    A dye has an Rf value of 0.6 in water. If the solvent front moves 10 cm, how far will the dye move, in cm?

    Answercm

  10. Question 10

    Reference Rf values in the same solvent: dye A 0.15, dye B 0.35, dye C 0.55, dye D 0.8. An unknown ink gives one spot that moves 7 cm when the solvent moves 20 cm. Which dye is it?

    • A. dye B
    • B. dye C
    • C. dye A
    • D. dye D

  11. Question 11

    On a chromatogram the solvent front moved 5 cm from the start line and a spot moved 3.7 cm. What is the Rf value of the spot? Give 2 decimal places.

    Answer

  12. Question 12

    A dye has an Rf value of 0.8 in water. If the solvent front moves 10 cm, how far will the dye move, in cm?

    Answercm

  13. Question 13

    Reference Rf values in the same solvent: dye A 0.15, dye B 0.35, dye C 0.55, dye D 0.8. An unknown ink gives one spot that moves 11 cm when the solvent moves 20 cm. Which dye is it?

    • A. dye C
    • B. dye D
    • C. dye A
    • D. dye B

  14. Question 14

    On a chromatogram the solvent front moved 6 cm from the start line and a spot moved 1.8 cm. What is the Rf value of the spot? Give 2 decimal places.

    Answer

  15. Question 15

    A dye has an Rf value of 0.3 in water. If the solvent front moves 10 cm, how far will the dye move, in cm?

    Answercm

  16. Question 16

    Reference Rf values in the same solvent: dye A 0.15, dye B 0.35, dye C 0.55, dye D 0.8. An unknown ink gives one spot that moves 7 cm when the solvent moves 20 cm. Which dye is it?

    • A. dye B
    • B. dye C
    • C. dye A
    • D. dye D

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Answer key: Calculate and use Rf values in chromatography

  1. 1. D. dye B

  2. 2. 0.53

  3. 3. 3 cm

  4. 4. B. dye C

  5. 5. 0.35

  6. 6. 5.4 cm

  7. 7. A. dye B

  8. 8. 0.88

  9. 9. 6 cm

  10. 10. A. dye B

  11. 11. 0.74

  12. 12. 8 cm

  13. 13. A. dye C

  14. 14. 0.3

  15. 15. 3 cm

  16. 16. A. dye B