DP Chemistry Questionbank

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• 18M.3.sl.TZ2.5b: Discuss three properties a substance should have to be suitable for use in liquid crystal displays.
• 18M.3.sl.TZ1.4a: Both of these are thermoplastic polymers. Outline what this term means.
• 18M.3.sl.TZ1.3b.iv: State the property of carbon nanotubes that enables them to form a nematic liquid crystal phase.
• 18M.3.hl.TZ2.6b: MWCNT are very small in size and can greatly increase switching speeds in a liquid crystal...
• 17N.3.sl.TZ0.7a: Outline two properties a substance should have to be used as liquid-crystal in a liquid-crystal...
• 17M.3.sl.TZ2.6a: Two important properties of a liquid crystal molecule are being a polar molecule and having a...
• 16N.3.sl.TZ0.7b: Explain the effect of increasing the temperature of a nematic liquid crystal on its directional...
• 16N.3.sl.TZ0.7a: Outline how a lyotropic liquid crystal differs from a thermotropic liquid crystal.
• 16M.3.sl.TZ0.6b: Explain why the nitrile group enables these molecules to be used in liquid-crystal displays (LCDs).
• 16M.3.sl.TZ0.6a: Suggest how changing the size or shape of the hydrocarbon chain would affect the molecule’s...
• 15M.3.hl.TZ1.10c: Describe and explain, in molecular terms, the workings of a twisted nematic liquid crystal.
• 15M.3.hl.TZ2.15a: Explain how the structure of biphenyl nitriles makes them suitable for use in liquid-crystal...
• 15M.3.sl.TZ1.8b.ii: Suggest how the C5H11 chain contributes to the liquid-crystal properties of the compound.
• 15M.3.sl.TZ1.8a: The diagram below shows eight molecules in the liquid state. Suggest, with a diagram, a possible...
• 15M.3.sl.TZ1.8b.i: Suggest, with reference to the structure, why the molecule is able to change orientation in an...
• 15M.3.sl.TZ1.8b.iii: Explain why a liquid-crystal device may be unreliable at low temperatures.
• 15M.3.sl.TZ2.12b: Suggest the essential feature a liquid-crystal molecule must have so that the display can be...
• 15M.3.sl.TZ2.12a: Identify the structural feature of cholesteryl benzoate which makes it suitable for use as a...
• 14M.3.hl.TZ2.13b: List two properties needed for a substance to be used in a liquid-crystal display.
• 14M.3.hl.TZ2.13a: Describe the meaning of the term liquid crystal.
• 14M.3.sl.TZ1.10a: (i)     Describe the meaning of the term liquid crystals and state which of the representations...
• 14M.3.sl.TZ1.10b: (i)     State one difference between thermotropic and lyotropic liquid crystals.       (ii)  ...
• 14N.3.hl.TZ0.12b: When a liquid-crystal display is warmed with a hairdryer, the display loses its clarity and may...
• 14N.3.hl.TZ0.12a: Describe the meaning of the term liquid crystals.
• 14N.3.sl.TZ0.11a: Describe the meaning of the term liquid crystals.
• 14N.3.sl.TZ0.11b: When a liquid-crystal display is warmed with a hairdryer, the display loses its clarity and may...
• 13N.3.hl.TZ0.12c: The molecule below has liquid-crystal display properties. Suggest two reasons why the molecule...
• 13N.3.hl.TZ0.12a: State what the observer would see if the liquid crystal was not present and there was no voltage...
• 13N.3.hl.TZ0.12b.i: Explain how the addition of a liquid crystal to the cell changes what the observer sees.
• 13N.3.hl.TZ0.12b.ii: Explain how the application of an electric field between the electrodes,...
• 13N.3.sl.TZ0.10: Liquid-crystal displays are used in many electronic appliances. The molecule below has...
• 13M.2.sl.TZ1.8b.ii: Suggest what would happen to the pH of the solution as the reaction proceeds.
• 13M.3.sl.TZ1.C3a: State the property of the liquid-crystal molecules that allows them to align when a voltage is...
• 13M.3.sl.TZ1.C3b: List two substances that can behave as liquid crystals.
• 13M.3.sl.TZ1.C3c: Distinguish between thermotropic and lyotropic liquid crystals.   Thermotropic liquid...
• 09N.3.hl.TZ0.C5b: Describe and explain in molecular terms the workings of a twisted nematic liquid crystal.
• 09N.3.hl.TZ0.C5a: Explain how the three different parts of the molecule contribute to the properties of the...
• 10M.3.hl.TZ1.C2e: Kevlar is an example of a lyotropic liquid crystal. Outline what is meant by lyotropic liquid...
• 10M.3.hl.TZ2.C3: (a)     State one other example of a lyotropic liquid crystal and describe the difference between...
• 10M.3.sl.TZ2.C4: Detergents are one example of lyotropic liquid crystals. State one other example of a lyotropic...
• 09M.3.sl.TZ1.C2a: Describe the meaning of the term liquid crystals. State and explain which diagram, I or II,...
• 09M.3.sl.TZ1.C2b: Distinguish between thermotropic and lyotropic liquid crystals and state one example of each type.
• 09M.3.sl.TZ1.C2c: Discuss the properties needed for a substance to be used in liquid crystal displays.
• 09M.3.sl.TZ2.C4a: Compare the positional and directional order in a crystalline solid, nematic phase liquid crystal...
• 11M.3.sl.TZ2.C3a: Describe the liquid-crystal state, in terms of molecular arrangement, and explain what happens as...
• 11M.3.sl.TZ2.C3b: Discuss three properties a substance should have if it is to be used in liquid-crystal displays.
• 12M.3.hl.TZ1.C4b: Discuss the additional properties that a substance must have to make it suitable for commercial...
• 12M.3.hl.TZ1.C4c: Explain what is meant by the term lyotropic.
• 12M.3.hl.TZ1.C4a: State the properties that a molecule, such as Kevlar, must have in order to enable it to behave...
• 12M.3.sl.TZ1.C3d: One product that is made from crude oil is the chemical feedstock that can be used to synthesize...
• 12M.3.hl.TZ2.C3a: Distinguish between thermotropic liquid crystals and lyotropic liquid...
• 12M.3.hl.TZ2.C3b: Two substances that can be used in liquid crystals are commonly called PAA (4-azoxydianisole) and...
• 12M.3.hl.TZ2.C3c: Explain the workings of liquid crystals made up of compounds such as 5CB in liquid-crystal displays.
• 11N.3.sl.TZ0.C4b: Explain the effect of increasing the temperature on the nematic liquid crystal.
• 11N.3.sl.TZ0.C4a: Describe the nematic liquid-crystal phase in terms of the arrangement of the molecules.