Chemistry at Dow University Of Health Sciences | Flashcards & Summaries

Lernmaterialien für chemistry an der Dow University of Health Sciences

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Diameter  of an atom
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0.1 nm — 0.5 nm
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Which of the following method is used to estimate oxygen in an organic compound?
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Combustion  method 
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Duma's  method 
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Dumas method is appropriate to determine the molecular weights of volatile organic substances that are liquids at room temperature. method for the quantitative determination of nitrogen in chemical substances 
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TESTE DEIN WISSEN
Copper(II)oxide is mixed with organic compound during combustion,  the purpose is
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To carry out complete combustion
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Substance used to absorb CO² gas in combustion analysis is,
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KOH (potassium hydroxide)
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Kjeldahl method
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TESTE DEIN WISSEN
analytical chemistry is a method for the quantitative determination of nitrogen contained in organic substances plus the nitrogen contained in the inorganic compounds ammonia and ammonium, uses a hot acid digestion to convert protein to ammonia, which is then distilled into a standardized acid and the acid is back titrated to give the quantitative estimate
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vapour density . 
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= mass of n molecules of gas / mass of n molecules of hydrogen
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Law of multiple proportions?
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statement that when two elements combine with each other to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers. Example: CuO, Cu₂O
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Dalton's law directly explains
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TESTE DEIN WISSEN
The law of conservation of mass
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Huckel's law explains 
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TESTE DEIN WISSEN
Aromaticity of benzene ring.

1. Each ring member should have one 2p orbital.
2. Ring must be planar offer nearly planar.
3. Molecule must have 4n+2 electrons in the delocalised, conjugated p orbital cloud. 
4. The molecule must be cyclic. 
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TESTE DEIN WISSEN
Why we used CCl4 in halogenation of alkenes?
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TESTE DEIN WISSEN
Because it has no C-H bonds, carbon tetrachloride does not easily undergo free-radical reactions. it’s just to distinguish this from the reaction where the solvent is H2O, in which case a bromohydrin is formed
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TESTE DEIN WISSEN
isoelectronic
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  1. having the same numbers of electrons or the same electronic structure.
    "carbon monoxide is isoelectronic with nitrogen"
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Q:
Diameter  of an atom
A:
0.1 nm — 0.5 nm
Q:
Which of the following method is used to estimate oxygen in an organic compound?
A:
Combustion  method 
Q:
Duma's  method 
A:
Dumas method is appropriate to determine the molecular weights of volatile organic substances that are liquids at room temperature. method for the quantitative determination of nitrogen in chemical substances 
Q:
Copper(II)oxide is mixed with organic compound during combustion,  the purpose is
A:
To carry out complete combustion
Q:
Substance used to absorb CO² gas in combustion analysis is,
A:
KOH (potassium hydroxide)
Mehr Karteikarten anzeigen
Q:
Kjeldahl method
A:
analytical chemistry is a method for the quantitative determination of nitrogen contained in organic substances plus the nitrogen contained in the inorganic compounds ammonia and ammonium, uses a hot acid digestion to convert protein to ammonia, which is then distilled into a standardized acid and the acid is back titrated to give the quantitative estimate
Q:
vapour density . 
A:
= mass of n molecules of gas / mass of n molecules of hydrogen
Q:
Law of multiple proportions?
A:
statement that when two elements combine with each other to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers. Example: CuO, Cu₂O
Q:
Dalton's law directly explains
A:
The law of conservation of mass
Q:
Huckel's law explains 
A:
Aromaticity of benzene ring.

1. Each ring member should have one 2p orbital.
2. Ring must be planar offer nearly planar.
3. Molecule must have 4n+2 electrons in the delocalised, conjugated p orbital cloud. 
4. The molecule must be cyclic. 
Q:
Why we used CCl4 in halogenation of alkenes?
A:
Because it has no C-H bonds, carbon tetrachloride does not easily undergo free-radical reactions. it’s just to distinguish this from the reaction where the solvent is H2O, in which case a bromohydrin is formed
Q:
isoelectronic
A:

  1. having the same numbers of electrons or the same electronic structure.
    "carbon monoxide is isoelectronic with nitrogen"
chemistry

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