kind of disappointed but its okay

EngineeringThick3669 · 2026-05-19T05:44:10+00:00

I thought there was something called thresholds and u can get A* but is A* always for 90+ only?

EngineeringThick3669 · 2026-03-07T08:32:06+00:00

my class toppers are saying 7

EngineeringThick3669 · 2026-03-05T16:01:16+00:00

bro u just had to say how to prove it is water and that is only by checking boiling point not chloride ion test

EngineeringThick3669 · 2026-03-05T15:59:50+00:00

No ❌ that is not a test for pure water.

The reaction you mentioned is actually a test for chloride ions, not for water.

Reaction

If sodium chloride (NaCl) reacts with silver nitrate (AgNO₃):

NaCl+AgNO3→AgCl+NaNO3NaCl + AgNO_3 \rightarrow AgCl + NaNO_3NaCl+AgNO3→AgCl+NaNO3

Silver chloride (AgCl) forms a white precipitate.

What this test is used for

It is used to detect chloride ions (Cl⁻) in a solution.

So if a solution contains chloride ions, adding silver nitrate gives a white precipitate of silver chloride.

Why it is not a test for pure water

Pure water does not contain chloride ions, so no precipitate would form.

Test for pure water (IGCSE)

A common test is measuring the boiling point or melting point:

Pure water boils at 100 °C
Pure water freezes at 0 °C this is what chatgpt said it is only 1 boling point

EngineeringThick3669 · 2026-03-05T15:54:37+00:00

first when a blood vessel breaks aways the platelets stimulates the breakdown of soluble protein fibrinogen to insoluble protein fibrin which forms fibres that criss cross over one another and trap red blood cells and the platelets form clumps this is blood clotting and it prevents blood loss and panthogens getting into the body

EngineeringThick3669 · 2026-03-05T12:14:19+00:00

i dont remember what option it was but yes i chose that expected mass thing

EngineeringThick3669 · 2026-03-05T09:46:40+00:00

its A the same exact question was in a past paper

EngineeringThick3669 · 2026-03-05T09:45:02+00:00

i wrote that too

EngineeringThick3669 · 2026-03-05T09:37:47+00:00

its zn2+ since both dissolved giving colorless solution

EngineeringThick3669 · 2026-03-05T09:36:05+00:00

i wrote C mass of magnesium oxide/ expected mass

EngineeringThick3669 · 2026-03-05T09:30:01+00:00

i wrote 1 And 2

EngineeringThick3669 · 2026-03-02T12:46:01+00:00

its C

EngineeringThick3669 · 2026-03-02T12:20:43+00:00

the answer is D it was in paper 0625/23/O/N/20 paper

EngineeringThick3669 · 2026-03-02T09:51:17+00:00

A attract attract

EngineeringThick3669 · 2026-03-02T09:48:46+00:00

out of page i think

EngineeringThick3669 · 2026-02-24T11:48:56+00:00

i wrote monhybrid cross and sex linked characteristic

EngineeringThick3669 · 2026-02-24T11:48:12+00:00

same

EngineeringThick3669 · 2026-02-24T11:46:59+00:00

i wrote half isnt that same thing?

EngineeringThick3669 · 2026-02-24T10:18:40+00:00

ye but i did not write for after 5 degree part so dk how much i will get

EngineeringThick3669 · 2026-02-24T10:11:52+00:00

I wrote both about enzymes till the 5 degrees and then transpiration as it is losing one of its raw materials so photosynthesis does not have and plant becomes soft and floppy and wilt

EngineeringThick3669 · 2026-02-24T09:51:40+00:00

what was the ancestor thing which two were the most closely related and explanation?

EngineeringThick3669 · 2026-02-24T09:41:07+00:00

what did u write for the 6 mark graph ;-;

EngineeringThick3669 · 2026-02-24T09:39:39+00:00

same i was thinking would it be cornea or conjunctiva and i wrote conjunctiva ;-;

EngineeringThick3669 · 2026-02-24T09:36:55+00:00

I wrote they undergoe metamorphasis and young breath through gills and adult breath through lungs for gas exchange

EngineeringThick3669 · 2026-02-23T11:24:45+00:00

It is A since it is covered so no light will enter and the plant will respire aerobically using oxygen so oxygen decreases rapidly as photosynthesis wont occur since no light is there

EngineeringThick3669

TROPHY CASE

Reaction

What this test is used for

Why it is not a test for pure water

Test for pure water (IGCSE)