View Full Version : Science Help Needed
Wayne
17-07-2005, 07:53 PM
I'm doing a practice science paper, and I'm stuck on the last few questions.
This is one of them:
X, Y and Z represent 3 halogens
Y displaces X from a solution of its ions
Z does not displace X or Y from solutions of their ions
What is the order of their reactivities?
A - X Y Z
B - Y X Z
C - Y Z X
D - Z X Y
If you can explain to me what it means, I will be very greatful. :rolleyes:
Legend-Killa
18-07-2005, 07:49 AM
Ok im not really sure but i think its D-ZXY
Because Z does not displace anything then X doesnt displace anything then Y wont affect the 2 before it i think... wat year is this? Im only 12 turning 13 2moro so i dont know if im right (going into 8th grade)
Detox
18-07-2005, 11:33 AM
Wouldnt it be XYZ because Z does not displace either X or Y so it is least reactive, X displaces Y so it must be the most reactive.
Legend-Killa
18-07-2005, 05:13 PM
I guess i was rong -.-
Tommy
28-07-2005, 11:15 PM
Nooo not chemistry *Cries*
I was never good at that. Im thinking B? Y X Z
Wayne
28-07-2005, 11:16 PM
Lmao. Nvm, I've had the results back ages ago. ;)
The answer was actually B :o
Tommy
28-07-2005, 11:17 PM
Omg i got it right,why did i get a B on my Halogens test?
Emicat
03-08-2005, 10:00 AM
*falls alseep* -.- zZzZz.....
Swan0
04-08-2005, 05:26 PM
Sooo boring science is sum time ZzZzZzZzzzZZZzZZZZ
Shadowrock!
16-08-2005, 07:42 PM
its B
becuz if you replace them with names
sodium = Y
pottasium = X
francium = Z
X, Y and Z represent 3 halogens
Y displaces X from a solution of its ions
Z does not displace X or Y from solutions of their ions
What is the order of their reactivities?
A - X Y Z
B - Y X Z
C - Y Z X
D - Z X Y
if Y displaces X that means it has a higher reactivity. that means that Y is now top... but Z doesent displace X or Y, so Y is the highest. that means you only have b and c.
But Z doesent displace X either, so Z must be the least reactive that leaves you with.
Y - X - Z
Ste471
16-08-2005, 07:55 PM
That question wasnt exactly clear either didnt didnt say whether it wanted it from least reactive to most reactive or the other way round.
If I had answered it i would have got it wrong because i would have gone least to most
!-.Scammed.-!
22-08-2005, 05:33 PM
I'm Going Into Yr 7!
Lol!!!!
samuel
09-10-2005, 12:51 AM
More like college math o.o
im only 13. :l
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