is this true? (1 Viewer)

[bobbie212]

for the pracs we did involving rate of corrosion, do we have to say we weighed the metals each day to check for mass loss, or are u guys just saying you did that at the end.

 

[smallcattle]

weigh?? our teacher never told us to weigh it.. just observe and see if there is rust forming on the surface through out the experiment

 

[lucyinthehole]

yeah, ours was very qualitative... you know "this is more rusty" kinda thing. but i guess putting that you dried it, then weighed it can't hurt

 

[mathock]

yeah just say u weighed it, if its needed then you've said it, if it isnt, it doesnt affect the reaction so u cant lose marks for being cautious

 

[bobbie212]

yea but im not aksin if it should be weighed, im asking how ofen, each day or only once at theend of the prac

 

[lucyinthehole]

probably the end is best, since taking out would desrupt the experiment by bringing in other variables

 

[aim54x]

by cleanin off d rust at d end of the prac and reweighin the sample the mass lost to corrosion is found

 

[bobbie212]

obvioulsy, but its all about the rate of corrosion. if u weigh them each day and graph the results the rate can be found that way but im unsure

 

[lucyinthehole]

obvioulsy, but its all about the rate of corrosion. if u weigh them each day and graph the results the rate can be found that way but im unsure

no, the focus is comparing the rate of corrosion, so by seeing the difference in weight between the different nails, for the same amount of time, you can tell which one rusts faster

 

[mathock]

i would weigh them daily... if the graph of the rate of corrosion isnt linear, then by just weighing at the end u could get some screwed up results... as long as the system is intact and not disturbed u dont have much to worry bout

 

[aim54x]

weighin them without cleanin wont get u anywhere. if u weigh them at d end after cleanin them u can compare the extent of corrosion. if u clean them everyday u destroy the system.

i didn't do this prac but read bout it. i would've thought that weighin without cleanin wouldn't show major differences in weight.

 

[bobbie212]

ofcourse u hav to clean and dry em...bt fuck it ill just say weighed at the end

 

[aim54x]

that is wat im goin to write. it makes sense and i got it form the SucessOne book as an answer for the 2003 paper