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- 1. Multiple ChoiceWhat is chemical analysis?Identifying unknown substancesAnalytical chemistryIdentifying known substancesChemical experiments
- 2. Multiple ChoiceIn everyday language what is a "pure" substance?Made of one compoundNo additivesA mixtureClean
- 3. Multiple ChoiceIn chemistry what is a "pure" substance?No additivesA mixtureMade of one element/compound onlyA formulation
- 4. Multiple ChoiceHow can pure substances be distinguished from impure ones?Melting/boiling pointsColourSmellTemperature
- 5. Multiple ChoiceDescribe the melting and boiling points of pure substancesRange of temperatureFixedDifferent temperatureOne very specific temperature
- 6. Multiple ChoiceDescribe the melting and boiling points of impure substancesFixedRange of temperatureDifferent temperatureOne very specific temperature
- 7. Multiple ChoiceWhat is a formulation?MilkA designed mixtureCalculationA random mixture
- 8. Multiple ChoiceGive an example of a formulationChlorineAcetonePaintOxygen
- 9. Multiple ChoiceName a process to separate the constituents of a mixtureOxidationDisplacementChromotographyCombustion
- 10. Multiple ChoiceIn paper chromatography, what is the mobile phase?Pencil linePaperInkSolvent e.g. water
- 11. Multiple ChoiceHow can chromatography show pure or impure substances?Impure = no dotsPure = many dotsImpure = single dotPure = single dot
- 12. Multiple ChoiceWhat value is equal to [dot distance / solvent front distance]?RfMrArMoles
- 13. Multiple ChoiceWhat does a substance's Rf value depend on?SolubilityGravitySize of compoundColour
- 14. Multiple ChoiceIn chromatography, why is a pencil used to draw the line?It’s insolubleIt's solubleIt's sharperNeutral colour
- 15. Multiple ChoiceIn chromatography, where must the solvent height be compared to the pencil line?AboveBelowLevel withDoesn't matterOn
- 16. Multiple ChoiceA squeaky-pop when a gas is lit shows the presence of which gas?OxygenHydrogenChlorineCarbon DioxideHelium
- 17. Multiple ChoiceWhat type of gas is able to relight a glowing splint?OxygenHydrogenChlorineCarbon DioxideHelium
- 18. Multiple ChoiceA gas that turns limewater from colourless to cloudy is?OxygenHydrgogenCarbon DioxideChlorineHelium
- 19. Multiple ChoiceA gas that turns damp blue litmus paper from blue to red and then white is?OxygenHydrogenCarbon DioxideChlorineHelium
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