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What else can I help you with?
Why does fluorene move faster down the column chromatography than fluorenone?
Well it depends on the solvent you are using, but lets assume you use pentane as the solvent for fluorene and diethyl ether as the solvent for fluorenone. Used in this order, fluorene should actaully move slower down the column due to the the polarity of the alumina and the nonpolarity of the solvent (pentane). Since fluorene is less polar so, remember the rule like dissolves like? Well, this kind of applies to chromatography wherein rather than dissolve just replace it with moves with, so like moves with like. That being said the pentane will "carry" the fluorene through the alumina slower than the latter (which I will explain). Fluorenone is polar because of its C=O bond, that being said the dielectric constant of diethyl ether is 4.3 which means it has intermediate polarity (remember that pentane has a dielectric constant of 2.1 I think, so it is nonpolar). Since the alumina, diethyl ether, and the fluorenone are all polar, the fluorenone will travel faster through the alumina than would the fluorene, because there is no attraction between all these polar compounds which will allow it to move faster, rather than a nonpolar and polar chemical having an attration towards each other and thus moving more slowly. Hope this helps, Branden
Polarity order of ibuprofen Aspirin acetaminophen and caffeine?
Caffeine > Acetaminophen > Ibuprofen > ASA Actually ASA is more polar than Ibuprofen. In ethanol ASA rf value is around .7 and Ibuprofen is around .77. Should be Caffeine > Acetaminophen > ASA > Ibuprofen Rf in ethanol Caffeine < Acetaminophen < ASA < Ibuprofen
How do you know if a molecular compound has a dipole-dipole attraction?
A dipole moment is defined as a measure of the molecular polarity of a compound; the magnitude of the partial charges on the ends of a molecule times the distance between them (in meters). In order for there to be a dipole moment the element must must have molecular polarity which results from molecules with a net imbalance of charge (often a result of differences in electronegativity). If the molecule has more than two atoms, both shape and bond polarity determines the molecular polarity. In general look for a difference in electronegativity of the elements of a molecule which results in polarity and thus a possible dipole moment. Note that molecular shape influence polarity so molecules with the same elements but a different shape (and vice versa) won't have the same dipole moment.
How do you beat level 21 on n3wton?
In order to beat level 21 on n3wton, you need to carefully manipulate the gravitational forces in the game by clicking on orbs to change their polarity. Experiment with different patterns of polarity changes to create a path that allows the ball to reach the goal without hitting any obstacles. Timing and precision are key to completing this level successfully.
How can you tell if bumps on the oscilloscope trace are due to the stimulus artifact or are part of a compound action potential?
The stimulus artifact is biphasic and roughly symmetrical. If you reverse the polarity of the stimulus you will see no or little change in the stimulus artifact but should see a decrease or absence of the neural response. The rate of change in a stimulus artifact is generally an order of magnitude faster than most neural responses so that filtering will disproportionally affect it. Always set your stimulus to lowest strength needed to elicit a response before reversing polarity. If you are on the wrong polarity this has the risk of killing your preparation.
Why does fluorene move faster down the column chromatography than fluorenone?
Well it depends on the solvent you are using, but lets assume you use pentane as the solvent for fluorene and diethyl ether as the solvent for fluorenone. Used in this order, fluorene should actaully move slower down the column due to the the polarity of the alumina and the nonpolarity of the solvent (pentane). Since fluorene is less polar so, remember the rule like dissolves like? Well, this kind of applies to chromatography wherein rather than dissolve just replace it with moves with, so like moves with like. That being said the pentane will "carry" the fluorene through the alumina slower than the latter (which I will explain). Fluorenone is polar because of its C=O bond, that being said the dielectric constant of diethyl ether is 4.3 which means it has intermediate polarity (remember that pentane has a dielectric constant of 2.1 I think, so it is nonpolar). Since the alumina, diethyl ether, and the fluorenone are all polar, the fluorenone will travel faster through the alumina than would the fluorene, because there is no attraction between all these polar compounds which will allow it to move faster, rather than a nonpolar and polar chemical having an attration towards each other and thus moving more slowly. Hope this helps, Branden
What is the increasing polarity order of bi phenyl benzhydrol benzophenone?
From least to most polar: biphenyl >> benzophenone >> benzhydrol
What happen when the polarity of transformer reversed?
You cannot 'reverse' the polarity of a transformer -it is either wound with 'additive polarity' or 'subtractive polarity', and there's not much you can do about it! For a single transformer, its polarity doesn't really matter. But if you are going to parallel two transformers, then you must know the polarity of each transformer in order to avoid harmful circulating currents in their secondary windings.
Why do you think about the polarity of the different ingredients in your salad dressing in order for it to turn out well?
It is not necessary that all salad ingredients must be soluble or miscible; so eat salads without the care of polarity.
What is maximum percentage oil yield in ethanol or methanol?
polarity order of ehanol methanol n-hexane and distilled water
What is the elution order of compounds in column chromatography?
In column chromatography, compounds elute in order of increasing polarity. This means that less polar compounds will elute first, followed by more polar compounds.
Polarity order of ibuprofen Aspirin acetaminophen and caffeine?
Caffeine > Acetaminophen > Ibuprofen > ASA Actually ASA is more polar than Ibuprofen. In ethanol ASA rf value is around .7 and Ibuprofen is around .77. Should be Caffeine > Acetaminophen > ASA > Ibuprofen Rf in ethanol Caffeine < Acetaminophen < ASA < Ibuprofen
What is successive extraction?
Successive extraction of any plant part involves sequential extraction ( e.g. employing soxhlet apparatus or maceration) using solvents with increasing polarity. Following each extraction, the marc (refuse matter that remains after extract has been filtered) will be dried before being extracted using solvent with higher polarity. For example, the following solvents can be used in successive order (lower to higher polarity): petroleum ether then chloroform then ethyl acetate, then methanol.
Can a power surge cause a motor to go into reverse polarity?
No. If you have phase 1, 2, 3 (in that order), and phase 1 is the highest voltage at the instant a switching event occurs (causing a power surge), the surge voltage will be highest in phase 1. For polarity to change, you would need phase 2 to instantaneously change to greater than 1, which will not happen.
What are some eight letter words with 1st letter F and 6th letter E and 8th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern F----E-E. That is, eight letter words with 1st letter F and 6th letter E and 8th letter E. In alphabetical order, they are: fistmele fluorene
How do you know if a molecular compound has a dipole-dipole attraction?
A dipole moment is defined as a measure of the molecular polarity of a compound; the magnitude of the partial charges on the ends of a molecule times the distance between them (in meters). In order for there to be a dipole moment the element must must have molecular polarity which results from molecules with a net imbalance of charge (often a result of differences in electronegativity). If the molecule has more than two atoms, both shape and bond polarity determines the molecular polarity. In general look for a difference in electronegativity of the elements of a molecule which results in polarity and thus a possible dipole moment. Note that molecular shape influence polarity so molecules with the same elements but a different shape (and vice versa) won't have the same dipole moment.
How does the order of elution on a TLC plate compare between different compounds?
The order of elution on a TLC plate varies between different compounds based on their polarity. More polar compounds tend to move slower and elute later, while less polar compounds move faster and elute earlier.
