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Original post by Miminfl
Anyone retaking this unit?
Yep. Grade boundaries will be v high though as only retake students doing it?
Original post by madeleinewood
Yep. Grade boundaries will be v high though as only retake students doing it?
I don't know the tbh, if the students do really good in the paper they r prob gonna be high maybe 52 or 53 for an A , I hope they be nice to us this year and keep it decent
Original post by Sunny775
Can someone tell me the colour changes we need to remember
The displacement reaction of halogens and precipitation reaction of halogens
Original post by Miminfl
The displacement reaction of halogens and precipitation reaction of halogens
The displacement ones really confuse me. What exactly are they? it chnages form bk to book
Original post by Sunny775
The displacement ones really confuse me. What exactly are they? it chnages form bk to book
Basically it's when a more reactive molecule displaces a less reactive molecule for example
Chlorine is more reactive than bromine and iodine so if you add cl2 gas into Nabr(Br-) and to NaI you'll get this
Cl2+2Br- -----> Br2 + 2Cl-
Colour change to orange and orange in cyclo hexane
The same principle applies to NaI
But the colour change is brown , and violet in cyclohexane.
Br2 is more reactive than than I
Etc
Iodine cannot displace neither becuz its less reactively than chlorine and bromine
(edited 6 years ago)
is everyone ready for tomorrow????
Original post by a-spiringmedic
is everyone ready for tomorrow????
It depends of how the paper is gonna be for us retakers wbu?
How did everyone find it!?
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I reckon it's gonna be 51 for an A. And I think it was polar
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Original post by factly
Was ClO2 polar or non polar? How many boxes did everyone tick for this question? What's everyone's Grade boundary predictions?
I think it's polar and I did all of them 😂
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Original post by factly
Was ClO2 polar or non polar? How many boxes did everyone tick for this question? What's everyone's Grade boundary predictions?
I said it was polar and ticked 2 of the boxes
Guys what did you get for the volume of gas? What's was the value of X in the waters of crystallisation question.
Original post by chanda01
Was the question what molecules are polar or non-polar?
And what did you guys get for the group 2 metal we had to work out?
And what did you guys get for the group 2 metal we had to work out?
I got stuck on it for a bit but ended up with strontium I think
Original post by Jellybeans00
Guys what did you get for the volume of gas? What's was the value of X in the waters of crystallisation question.
I got something like 1440cm^3 and 7 as x
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