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OCR B A Level Chemistry Specimen Papers Questions

Alex Lyes 14 preguntas 5,0 (1 valoración)

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  1. 1A flame test should be carried out using a [blank_start]nichrome[blank_end] wire and [blank_start]concentrated[blank_end] HCl. If it was calcium that was being tested the flame would be [blank_start]brick-red[blank_end].
    1. Anichrome
    2. Bconcentrated
    3. Cbrick-red
  2. 2To test for the presence of iron(III) chloride in a sample of limestone you would add a solution of [blank_start]silver[blank_end] nitrate to the sample and a [blank_start]white[blank_end] precipitate will be formed for the chloride ions. You would also do a test for the Fe(III) by adding [blank_start]sodium hydroxide[blank_end] giving a [blank_start]brown[blank_end] precipirate.
    1. Asilver
    2. Bwhite
    3. Csodium hydroxide
    4. Dbrown
  3. 3The reagent used with sodium iodide to produce purer hydrogen iodide is [blank_start]phosphoric acid[blank_end].
    1. Aphosphoric acid
  4. 4The absorption of UV radiation by ozone is important for human life since UV radiation causes damage to [blank_start]skin[blank_end].
    1. Askin
  5. 5The shape of an ozone molecule is [blank_start]bent[blank_end] because there are [blank_start]3[blank_end] groups of electrons around a central O atom. The bond angle could be [blank_start]120°[blank_end].
    1. Abent
    2. Btriangular planar
    3. Cpyrimidal
    4. D3
    5. E4
    6. F120°
    7. G109.5°
    8. H107°
  6. 6First ionisation enthalpy [blank_start]increases[blank_end] across a period since the atoms [blank_start]increase[blank_end] in size meaning there are [blank_start]more protons & neutrons[blank_end] in the nucleus. The outer shell electrons are roughly the same distance from the nucleus since they are in the same shell so the attraction to the electrons is [blank_start]greater[blank_end] to they are [blank_start]more difficult[blank_end] to remove.
    1. Aincreases
    2. Bdecreases
    3. Cincrease
    4. Ddecrease
    5. Emore protons & neutrons
    6. Fless protons & neutrons
    7. Ggreater
    8. Hweaker
    9. Imore difficult
    10. Jeasier
  7. 7Rate of reaction decreases as temperature decreases since the molecules have [blank_start]less[blank_end] kinetic energy so there will be fewer collisions with sufficient acitvation [blank_start]enthalpy[blank_end] and also fewer collisions per second.
    1. Aless
    2. Benthalpy
  8. 8An equilibrium reaction is exothermic, increasing the temperature will shift the position of equilibrium in the [blank_start]endothermic[blank_end] direction (to the [blank_start]left[blank_end]) which will mean the concentration of product will [blank_start]decrease[blank_end].
    1. Aendothermic
    2. Bexothermic
    3. Cleft
    4. Dright
    5. Edecrease
    6. Fincrease
  9. 9% yield may be low if the reaction [blank_start]hasn't[blank_end] gone to completion or if there was [blank_start]loss[blank_end] of materials when transfering between vessels.
    1. Ahasn't
    2. Bloss
  10. 10Reactions go [blank_start]faster[blank_end] at higher temperatures since the particles have [blank_start]more[blank_end] kinetic energy and a larger proportion have enough kinetic energy for [blank_start]sucessful[blank_end] collisions to take place therefore the rate of reaction is [blank_start]faster[blank_end].
    1. Amore
    2. Bsucessful
    3. Cfaster
    4. Dfaster

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Descripción
A-Level Chemistry Test sobre OCR B A Level Chemistry Specimen Papers Questions, creado por Alex Lyes el 24/05/2016.
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English
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