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- 1. Multiple ChoiceTwo or more substances that are mixed together but not chemically combined is a ___compoundmixturekeratinchromatography
- 2. Multiple Choicechromatography separates the mixture of dyes on the basis of their ----------------------------densitysolubilitygravityboiling point
- 3. Multiple Choice
Ink can be separated by a method of -----------------------------------------------
distillation
filtration
chromatography
sedimentation
- 4. Multiple ChoiceTwo or more substances that are chemically combined is a ___compoundmixturesolventsolute
- 5. Multiple ChoiceA pure substance shows ------------------ spot on chromat gram0123
- 6. Multiple ChoiceThe diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?P onlyS onlyP and SP and X
- 7. Multiple ChoiceA student extracts the colour from some green smarties and uses paper chromatography to separate components colours. She finds blue has a Rf =0.38 and yellow Rf =0.75 this suggeststhe yellow is more strongly adsorbed onto the stationary phase and is less solublein the mobile phase.the yellow is more strongly adsorbed onto the stationary phase and is more soluble in the mobile phase.the blue is more strongly adsorbed onto the stationary phase and is less solublein the mobile phase.the blue is more strongly adsorbed onto the stationary phase and is less solublein the mobile phase.
- 8. Multiple ChoiceA high Rf value indicates strongstrong affinity to the stationary phasestrong affinity to the mobile phaseno affinity to the stationary phaseno affinity to the stationary phase
- 9. Multiple ChoiceA low retention time indicatesa high affinity to the mobile phasea low affinity to the stationary phasea high solubility in the mobile phaseall of the above
- 10. Multiple ChoiceThe Rf value for the blue component is0.30.7103
- 11. Multiple ChoiceThe Rf value for the red component is0.30.7107
- 12. Multiple ChoiceWhat two properties affect the Rt of a compound?
I Size/weight
II Polarity
III melting pointI onlyII onlyIII onlyI and II - 13. Multiple ChoiceWhich of the following factors would not affect an Rf valuesolvent usedtime takentemperaturepaper used
- Answer choicesTagsAnswer choicesTags