Chemistry ATP Tips

[AhsanAfzal]

Actually, this is incorrect, sorry, it is Neutral Oxide + Air ---> Acidic Oxide.
AhsanAfzal.
Sorry for the mistakes, I wrote this in a hurry. :/

Actually, this is incorrect, sorry, it is Neutral Oxide + Air ---> Acidic Oxide.
AhsanAfzal.
Sorry for the mistakes, I wrote this in a hurry. :/

give an example pls

 

[Saad Mughal]

give an example pls

NO and CO are neutral oxides.
They react with oxygen in the air to form acidic oxides.
2NO + O2 ---> 2NO2

 

[robinhoodmustafa]

Yeah, I know. I corrected it.
It is neutral oxide + air ---> acidic oxide.

kk.

 

[usama321]

Saad Mughal Bhai aap ka to level hai

 

[Saad Mughal]

kk.

Sorry for the confusion.

 

[Saad Mughal]

Saad Mughal Bhai aap ka to level hai

 

[usama321]

by the way isn't iron greyish?

 

[Saad Mughal]

by the way isn't iron greyish?

I didn't know about iron (never read about it), so I googled it and blackish type compounds showed up.
Just add the words shiny grey or shiny black, you'll get the mark(s).

 

[Zomane]

Pls ask someone. Its Important
I wrote Standard form values in my Mocks paper and they were accepted but School Teachers and CIE examiner.. Big Diff

Don't write in standard form because marking scheme doesn't have the values in standard. often they write 'or equivalent' in front of answers in mark schemes but in chemistry ATP they don't so you must use the actual values

 

[robinhoodmustafa]

Don't write in standard form because marking scheme doesn't have the values in standard. often they write 'or equivalent' in front of answers in mark schemes but in chemistry ATP they don't so you must use the actual values

The values are actual. Nothing round off just in Standard form. a person can easily make a mistake in converting Standard form From his calculator into Decimal

 

[AhsanAfzal]

The values are actual. Nothing round off just in Standard form. a person can easily make a mistake in converting Standard form From his calculator into Decimal

easy solution=press shift and then button "ENG" on ur calculator

 

[Dawarkazi]

Great work dude!! Thanks

 

[AhsanAfzal]

easy solution=press shift and then button "ENG" on ur calculator

u have to do it two times usually

 

[Saad Mughal]

Great work dude!! Thanks

 

[robinhoodmustafa]

easy solution=press shift and then button "ENG" on ur calculator

I did. The value moves ahead rather than backward

 

[AhsanAfzal]

I did. The value moves ahead rather than backward

this works in my calc

 

[TheStallion-Reborn]

awesome man!! can u please give sum info about naming the appratus and the safety precautions while using them?

 

[robinhoodmustafa]

this works in my calc

I have fx 570 Es series one.

 

[Suchal Riaz]

Saad Mughal thanks alot, it called many things which had gotten out of my mind.

 

[TheStallion-Reborn]

1. Carbon dioxide is an acidic gas which turns moist blue litmus red.
2.Same goes for chlorine - chlorine also bleaches the litmus white.
3.Ammonia is a basic gas and turns red litmus blue.
4. Sulphur dioxide is acidic too.

Some indicators for acids and alkalis are below:
Indicator - Color in Acid - Color in Alkali
1.Litmus - red - blue
2.Methyl orange - red - yellow/pink
3. Phenolphthalein - colorless - light pink
4. Screened methyl orange - red - green
5.Bromothyl blue - yellow - blue

Also:
Silver chloride, lead(II) chloride, calcium sulphate, barium sulphate, lead(II) sulphate, are insoluble.
Also all carbonates and sulphides are insoluble except Potassium, sodium and ammonium sulphides/carbonates.

Also this formula will help alot:
Concentration = mole OR mass/volume
REMEMBER to convert volume to dm3 or cm3 as per requirement.

Also when an ester is formed, the formula will be like this:
C2H5OH + C2C5COOH ---> H2O + C2H5COOC2H5, also written as C2H5COOHCH2CH3
Which means that the hydrogen of the carboxylic acid will react with the last OH of alcohol, and in pleace of the hydrogen put the alcohol without the OH.

Aluminum oxide is a drying agent.

Unless the curve is ACTUALLY smooth you will not get a correct value.

In electrolysis if you want to INCREASE the amount of the pure substance on the cathode, use an anode of the same metal. For example if you want more silver to be formed on cathode during electrolysis, use a silver nitrate solution and silver anode.

-Zomane

are u sure abt tht?? cx in an ester, the alcohol loses only a single Hydrogen atom and carboxylic acid loses OH! i guess uv mentioned the opposite????