Swarley's Chem Questions :)

[Greatness]

o.O that's what i thuoght but apparently you have to use heat for the reaction or something, so it's in gaseous state... Well thats what my teacher said (something along those lines)

[Greatness]

To calculate the concentration of somethiing in g L^-1 we multiply the concentration of x by its molar mass?? :/

[thushan]

Yup!

[Greatness]

1) How is galactose found in the body - like in what form? Because in my notes it says it's not found as a free monosaccharide.
2) My teacher said you have to becareful when you call a bond an 'amide' or 'peptide' link. He said someting along the lines of, you use amide if youre talking abuot general CONH bonds, but peptide link when its in a protein. Are examiners fussy about this?
3) Do we have to know that glucose has 5 OH groups etc?

[scocliffe09]

1) How is galactose found in the body - like in what form? Because in my notes it says it's not found as a free monosaccharide.
2) My teacher said you have to becareful when you call a bond an 'amide' or 'peptide' link. He said someting along the lines of, you use amide if youre talking abuot general CONH bonds, but peptide link when its in a protein. Are examiners fussy about this?
3) Do we have to know that glucose has 5 OH groups etc?

1) I'm pretty sure we break poly/disaccharides down, which is how galactose is present. E.g. as lactose (present in milk, for example) is broken down into glucose and galactose, the body now has to deal with both of those monosaccharides.
2) Yep. Can't hurt to get it right. ANY CONH bond is an amide bond, no matter where it is. If it's in a protein, we can call it a peptide bond too. Same with ether bonds - when they're in carbohydrates, suddenly we call them glycosidic linkages.
3) It's in the data book, so yes