Lumitailz wrote:When do fingerprints first form? and
Where do they originate?
10th week of pregnancy on the basal layer?
Lumitailz wrote:When do fingerprints first form? and
Where do they originate?
10th week of pregnancy on the basal layer?
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sciduck wrote:Lumitailz wrote:When do fingerprints first form? and
Where do they originate?10th week of pregnancy on the basal layer?
dermal papillae, pretty much same thing lol
sciduck wrote:The "plaster of Paris" contains what chemical?
Gypsum
me-myself_i wrote:sciduck wrote:The "plaster of Paris" contains what chemical?Gypsum
calcium sulfate, but you're not wrong.
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yellow_squirtle wrote:Let's revive this forum, shall we !!!
An unknown sample turns green when dissolved in water with Benedict's reagent and heated. What does this mean? Also, why does sucrose not provide a positive test result when it contains two sugars, one of them being glucose? (What is the other sugar that makes up sucrose?)
There are three parts to this questiono
that if the unknown sample turns green it indicates that it contains trace amounts of a reducing sugar. Sucrose does not provide a positive test result because it isn't a reducing sugar. Even though sucrose is made up of two reducing sugars glucose and fructose, sucrose is a disaccharide formed by the bonding of glucose and fructose through dehydration synthesis which results in a glycosidic bond that cannot be opened into open chain form with an aldehyde group (a characteristic of a reducing sugar).
Correct! Cute nickname, btwibaemax_o-o wrote:yellow_squirtle wrote:Let's revive this forum, shall we !!!
An unknown sample turns green when dissolved in water with Benedict's reagent and heated. What does this mean? Also, why does sucrose not provide a positive test result when it contains two sugars, one of them being glucose? (What is the other sugar that makes up sucrose?)
There are three parts to this questionothat if the unknown sample turns green it indicates that it contains trace amounts of a reducing sugar. Sucrose does not provide a positive test result because it isn't a reducing sugar. Even though sucrose is made up of two reducing sugars glucose and fructose, sucrose is a disaccharide formed by the bonding of glucose and fructose through dehydration synthesis which results in a glycosidic bond that cannot be opened into open chain form with an aldehyde group (a characteristic of a reducing sugar).
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