AS Chemistry Group 2

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kc97
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299152
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AS Chemistry Group 2
Updated:
2016-01-16 19:41:28
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Chemistry
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AS Chemistry Unit 2
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AS Chemistry Unit 2
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  1. What is the relationship between ionisation energy and Group 2 elements?
    As you go down group 2, ionisation energy decreases.
  2. Why does Ionisation energy decrease as you go down group 2? (2 marks)
    • Electron on the outer shell are further away from the nucleus so the effect of the strong nuclear force is reduced.
    • More shielding due to extra inner shells as you move down a group.
  3. What are the products of group 2 elements with water and what the general equation? ( 3 marks)
    • M (S) + 2H2(l)→ M(OH)2 (aq) + H2 (g)
    • Hydrogen
    • Metal hydroxide
  4. What is the trend of re-activity of group two elements with water and why are they like this? Which group 2 metal doesn't react with water?(3 marks)
    • Reactivity increases as you go down the group.
    • This is because the ionisation energies decrease as you go down the group
    • Berylium
  5. Why doesn't Beryllium react with water?
    Because of thick oxide layer on the surface of the metal.
  6. What is the product of group 2 elements with oxygen and what is the general equation for this?
    • Metal oxides
    • 2M(s) + O2 (g) →  2MO(S)
  7. What causes coloured flame in flame test?
    Electrons emitting a photon when returns to it ground state
  8. What a more accurate device to measure a flame test and how does it work and what is it used for? (3 marks)
    • A flame photometer
    • Measure the wavelength of the emitted light as it corresponds to a colour
    • Used to find the level of Naand K+ ions
  9. What is the trend of reactivity of group 2 metals with oxygen?
    As you go down the group reactivity increases.
  10. What is the product of group 2 elements with chlorine gas and what the general equation for this? (2 marks)
    • Metal chlorides
    • M(S) + Cl2(g) → MCl2(s)
  11. What is the trend of reactivity of group 2 metals with chlorine?
    As you go down the group reactivity increases.
  12. What is the product of group 2 oxides and water ;what the general equation; what is the implication of the reaction and why as well as what group 2 oxide is an exception and what the trend of solubility of metal oxide and why? (2 marks)
    • Metal hydroxide
    • MO(S) + H2O(l) → M(OH)2(aq)
    • A strong alkaline solution is produced due to the strong OH- ions
    • Magnesium oxide - reacts slowly
    • Solubility increases as you go down the group
    • because the hydroxides get more soluble
  13. What is the product of group 2 oxides and hydrochloric acid and what is the general equation for this? (2 marks)
    • Chloride salt and water
    • MO(s)+2HCl(aq) → MCl2(aq)+H2O(l)
  14. What is the product of group 2 oxides and dilute nitric acid and what is the general equation for this? (2 marks)
    • nitrate salt and water
    • MO(s)+2HNO3(aq)→M(NO3)2(aq)+H2O(l)
  15. What are oxides and hydroxides and what implication does this have? (2 marks)
    They are bases so can neutralise dilute acids.
  16. What is the product of group 2 hydroxides and dilute hydrochloric acid and what is the general equation for this?(2 marks)
    • group 2 metal chloride and water
    • M(OH)2(S) + 2HCl (aq) → MCl2(aq) +2H2O(l)
  17. What is the product of group 2 hydroxides and dilute nitric acid and what is the general equation for this?(2 marks)
    • group 2 metal nitrate and water
    • M(OH)2(S)+2HNO3(aq) → M(NO3)2(aq)+2H2O(l)
  18. What is the general equation of group 2 metals and sulphate;what is the trend for group 2 sulphate and which group sulphate is insoluble?(2 marks)
    • M+ H2SO→ MSO+ H2
    • Group 2 sulphate solubility increases as you go up the group.
    • Barium Sulphate
  19. What the relationship between group 2 elements and carbon cations? ( 2 marks)
    • Compounds of group 2 elements that contain singly charged negative ions (e.g OH-) increase solubility down the group.
    • Compounds of group 2 elements that contain doubly charged negative ions (e.g SO42-) increase solubility up the group.

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