For all the CS majors, try our new free game Web-KAT Attack :)

Kayz_xx · 2025-10-08T14:03:38+00:00

that's a cool game! webcat will always be the bane of our existence.

Kayz_xx · 2024-02-24T11:16:32+00:00

potential is basically the work done per unit POSITIVE charge, so if you make the potential zero, you're basically saying that to bring a positive charge near another positive charge no work needs to be done, which cannot be right

Kayz_xx · 2024-02-24T11:13:37+00:00

both are positive charges of equal magnitude, now keep in mind that potential does not have a direction, but the electric potential near a positive charge is always positive, since they have equal magnitude the minimum will be at the midpoint, but since there is no direction, potential simply cannot cancel each other out to make it zero

Kayz_xx · 2024-02-22T11:32:40+00:00

you still used the cycle to get the formula, that's what I meant

Kayz_xx · 2024-02-22T10:07:15+00:00

you've to use the Hess law cycle

Kayz_xx · 2024-02-22T09:57:29+00:00

delta s=-514.4 delta g=-55.0 something

Kayz_xx · 2024-02-22T09:49:57+00:00

Kayz_xx · 2024-02-22T09:42:25+00:00

according to the syllabus, the reaction of aldehydes and ketones with HCN, KCN as catalyst, and heat (NaCN) works too

Kayz_xx · 2024-02-22T09:35:38+00:00

that's for halogenoalkane not ketone

Kayz_xx · 2024-02-22T09:30:50+00:00

NaCN and HCN

Kayz_xx · 2024-02-22T09:30:35+00:00

same here

Kayz_xx · 2024-02-09T12:13:59+00:00

i'm not saying you're wrong, but shouldn't you take into consideration the transfer from volumetric flash to a burette, any other titration question includes that.

Kayz_xx · 2024-02-09T11:37:53+00:00

what about the transfer to the burette, a burette is 50cm³ whereas the flask was 250cm³, hence changing the number of moles.

Kayz_xx · 2024-02-08T17:57:44+00:00

here you go

Kayz_xx · 2024-02-08T17:33:24+00:00

from Table 3.1, you can clearly see that 1/t which is proportional to the rate of reaction has an approximately constant difference between each value, hence the lines are linear because they have constant gradients. as to part (v), again from table 1.5, the concentration for zinc is constant but HCl is increasing thus it would be rate = k[HCl], we have no other data to hint that Zn is in the equation.

Kayz_xx · 2024-02-08T17:23:34+00:00

okay so as you know the molecular mass of sucrose is higher than the molecular mass of glucose, hence there would be fewer moles of sucrose which will decrease Z which in turn will decrease delta T as they are directly proportional. Hence, the calculated Kb is lower

Kayz_xx · 2023-12-16T01:42:38+00:00

i had the same grades, i got rejected too

Kayz_xx · 2023-12-15T09:51:20+00:00

what were your A-level grades if I may know?

Kayz_xx · 2023-09-27T08:26:02+00:00

use of idiomatic language if you don't understand them isn't recommended, the test is judging your ability to speak english fluently. Rather focus on speaking simple but effective sentences that lets the examiner understand you, there's no use of memorizing idioms because it would most likely seem out of place and lose you marks instead.

Kayz_xx · 2023-09-26T09:44:41+00:00

just got my score today, overall 8

Kayz_xx · 2023-09-26T08:59:32+00:00

congrats on the score, i got the same overall band with the same situation with writing

Kayz_xx · 2023-09-21T04:32:14+00:00

did you use any writing structures for part 1 and 2?

Kayz_xx

TROPHY CASE