not very good don't waste a lot of time
Help!
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| powders with low angle of repose flow | freely
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| powders with high angle of repose flow | poorly
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| very fine or very large flow freely | large
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| particles size in the subsieve ragne can be obtained by ? and expressed a ? | gravity sedimentation/ stoke's law
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| equation for angle of repose | tan@=h/r
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| the closest packing is a | rhombohedral
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| 1-(true volume/bulk vol.) is = to | void
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| void times 100 = | porosity
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| weight of sample/volume of bulk | apparent density D=m/v
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| weight of sample/volume of true volume | true density ( the density without void)
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| volume of bulk/weight of sample | bulkiness
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| what does it mean to have a low apparent density | for the amount of volume it takes up, it doesn't weight much
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| bulk volume is | what you see or the volume occupiced by a powder placed in a graduated cylinder
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| the formula for bulk is | true volume of the solid + void
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| how do you find true volume | plug actual mass into the true density equation
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| powders wiht low apparent density and a large bulk volume are considered | light
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| powders with high apparent density and small bulk volum are | heavy
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| what is a good indicatior of packagina | comparing app density vs true density
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| medicated powders are for local effects, systemic effects or both | local and systemic
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| medicated powders are for internally, external,inhaled or what combination | external and internal and inhaled
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| crstalline alpha lactose monohydrate | inert propellant and diluent to aid the frmulations flow properties adn to protect the poweder from humidity
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| what method is used for potent substance to make individual dosing units | geometric dilution medthod
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| what method is used for non potent drugs | block and divide
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| headache powders, powdered laxative, douche powders are examples of bulk or divided powders | divided powders
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| a transparent waterproof paper | waxed paper
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| a glazed, transparent paper, also with limited moisture resistance | glassine
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| a thin semi opaque paper with limited moisture resistance | vegetable parchment
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| simple powder paper | bond paper
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| fluid massing or fluid bed processing is type of wet or dry | wet
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| what is the most common type of granulation | dry
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| compression of powder into large tablets is | slugging which is a dry method
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| when fine powders are forced between counter rotating rolls to form solid compact or sheet then reduced in size using mills or sieve granulators | roll compactor by dry granulation
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| what advantage do granules have over powders | flow better,more commonly used in tablets, more stable to the effects of atmospheric humidity, less likely to cake or harden upon standing, more easily wetted by liquids
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| examples of granulated products | lactines granules for diarreah due to antibiotic therapy, zantac efferdose tablets
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| effervescent salts are granules of what types of powders (like coarse or fine) | coarse to very coarse
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| effervescent salts contain medicinal agents in a dry mixture usually composed of | sodium bicarbonate, citric acid, and tartaric acid
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| when adding water to effervescent what is liberated to result in effervescent | carbon dioxide
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| in the dry method for preparing effervescent granules what acts as the binding agent | the one molecule of water present in each molecule of citric acid
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| in the wet method the source of binding agent is the | water added to alcohol as teh moistening agent forming the pliable mass for granulation
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