Periodic Properties Of Group 2 Element at International Medical University | Flashcards & Summaries

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Lernmaterialien für Periodic Properties of Group 2 Element an der International Medical University

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TESTE DEIN WISSEN
Atomic radius of group 2 elements (increase / decrease) down the group?
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TESTE DEIN WISSEN
Increase down the group
- Zeff constant, Z increases, shielding constant increases
- No. of shell increases
Lösung ausblenden
TESTE DEIN WISSEN
G2 cation is larger or smaller than its respective neutral atoms?
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TESTE DEIN WISSEN
Smaller
 They donate é
Lösung ausblenden
TESTE DEIN WISSEN
What is the general trend in the melting point of group 2 element?
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TESTE DEIN WISSEN
Decrease down the group
- melting point depends on the solid structure 
Lösung ausblenden
TESTE DEIN WISSEN
How can we test for calcium, strontium and barium in compound
Lösung anzeigen
TESTE DEIN WISSEN
By using flame test
• use a nichrome wire
• cleaned with [C] hydrochloric acid  
• dipped into a sample of the salt
• heat in a nonluminious Bunsen flame
Lösung ausblenden
TESTE DEIN WISSEN
What is formed when alkaline earth metal react with water?
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TESTE DEIN WISSEN
- Metal hydroxide
- Liberation of hydrogen gas
Lösung ausblenden
TESTE DEIN WISSEN
Reaction of group 2 more rigorous down going group. Yes/No.  Why?
Lösung anzeigen
TESTE DEIN WISSEN
Yes. Hydrogen gas released more rapidly going down group
Lösung ausblenden
TESTE DEIN WISSEN
Thermal decomposition of carbonates and nitrates of group 2 produce...
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TESTE DEIN WISSEN
Carbonates from group 2 give off carbon dioxide gas.
Nitrates from group 2 give of oxygen gas and nitrogen dioxide, which is a brown toxic gas.
Lösung ausblenden
TESTE DEIN WISSEN
What are the flame colour when group 2 react with oxygen (Be, Mg, Ca, Sr, Ba)
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TESTE DEIN WISSEN
Ba - reluctant to burn unless in powder form (due to strong but thin oxide layer)
Mg - Bright white flame
Ca - Brick red (orange) flame
Sr - scarlet red flame
Ba - apple green flame (Highly reactive, x contact with air)
Lösung ausblenden
TESTE DEIN WISSEN
What are the product when G2 oxides react with water
Lösung anzeigen
TESTE DEIN WISSEN
Only metal hydroxide produced, without liberation of hydrogen gas
E.g. SrO(s) +H2O(l) —> Sr(OH)2(aq)
Lösung ausblenden
TESTE DEIN WISSEN
Factors that determine the thermal stability. How?
Lösung anzeigen
TESTE DEIN WISSEN
-Polarisability of anion
• bigger é cloud easier to be distorted
• weakens C-O bond (CO3 2-)
• lower temperature is required to break the bond
(MgO always more stable than MgCO3)

-Polarising power of cation
• bigger cations
• low charge density
• less polarising power 
• cannot easily distort /polarised the electron cloud of anion
• high temperature is required to break the C-O bond
• more stable going down group, decomposition decreases
Lösung ausblenden
TESTE DEIN WISSEN
Thermal decomposition depends on thermal stability. What is the general trend of thermal stability down the group?
Lösung anzeigen
TESTE DEIN WISSEN
Increasthe down the group.
- higher temperature needed to decompose them.
Lösung ausblenden
TESTE DEIN WISSEN
Ionisation energy increase/decrease down the group?
Lösung anzeigen
TESTE DEIN WISSEN
Decrease
- increase in atomic size
• greater distance between nucleus and valence shell
• less attraction
- reactivity increases
• easier to remove an electron
• less E needed
Lösung ausblenden
  • 2102 Karteikarten
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  • 1 Lernmaterialien

Beispielhafte Karteikarten für deinen Periodic Properties of Group 2 Element Kurs an der International Medical University - von Kommilitonen auf StudySmarter erstellt!

Q:
Atomic radius of group 2 elements (increase / decrease) down the group?
A:
Increase down the group
- Zeff constant, Z increases, shielding constant increases
- No. of shell increases
Q:
G2 cation is larger or smaller than its respective neutral atoms?
A:
Smaller
 They donate é
Q:
What is the general trend in the melting point of group 2 element?
A:
Decrease down the group
- melting point depends on the solid structure 
Q:
How can we test for calcium, strontium and barium in compound
A:
By using flame test
• use a nichrome wire
• cleaned with [C] hydrochloric acid  
• dipped into a sample of the salt
• heat in a nonluminious Bunsen flame
Q:
What is formed when alkaline earth metal react with water?
A:
- Metal hydroxide
- Liberation of hydrogen gas
Mehr Karteikarten anzeigen
Q:
Reaction of group 2 more rigorous down going group. Yes/No.  Why?
A:
Yes. Hydrogen gas released more rapidly going down group
Q:
Thermal decomposition of carbonates and nitrates of group 2 produce...
A:
Carbonates from group 2 give off carbon dioxide gas.
Nitrates from group 2 give of oxygen gas and nitrogen dioxide, which is a brown toxic gas.
Q:
What are the flame colour when group 2 react with oxygen (Be, Mg, Ca, Sr, Ba)
A:
Ba - reluctant to burn unless in powder form (due to strong but thin oxide layer)
Mg - Bright white flame
Ca - Brick red (orange) flame
Sr - scarlet red flame
Ba - apple green flame (Highly reactive, x contact with air)
Q:
What are the product when G2 oxides react with water
A:
Only metal hydroxide produced, without liberation of hydrogen gas
E.g. SrO(s) +H2O(l) —> Sr(OH)2(aq)
Q:
Factors that determine the thermal stability. How?
A:
-Polarisability of anion
• bigger é cloud easier to be distorted
• weakens C-O bond (CO3 2-)
• lower temperature is required to break the bond
(MgO always more stable than MgCO3)

-Polarising power of cation
• bigger cations
• low charge density
• less polarising power 
• cannot easily distort /polarised the electron cloud of anion
• high temperature is required to break the C-O bond
• more stable going down group, decomposition decreases
Q:
Thermal decomposition depends on thermal stability. What is the general trend of thermal stability down the group?
A:
Increasthe down the group.
- higher temperature needed to decompose them.
Q:
Ionisation energy increase/decrease down the group?
A:
Decrease
- increase in atomic size
• greater distance between nucleus and valence shell
• less attraction
- reactivity increases
• easier to remove an electron
• less E needed
Periodic Properties of Group 2 Element

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