Chemistry ATP Tips

[Suchal Riaz]

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

press std then shift+eng button twice and calc will change answer into decimal.

 

[AhsanAfzal]

I have fx 570 Es series one.

i have fx 991ES

 

[Suchal Riaz]

I did. The value moves ahead rather than backward

shift+eng not only eng. and twice.

 

[robinhoodmustafa]

shift+eng not only eng. and twice.

doesnt work. I think my Calculator doesnt have that feature

 

[robinhoodmustafa]

i have fx 991ES

is that the old model ? Or the latest one with Solar panel

 

[Zomane]

Also one more tip:
Esters formed with alcohol and carboxylic acid are detected by their sweet smell.

 

[robinhoodmustafa]

press std then shift+eng button twice and calc will change answer into decimal.

I did.. Nothing happen

See.. I insert 2.57 x 10 ^ -3 in the calculator and follow ur step

 

[Suchal Riaz]

is that the old model ? Or the latest one with Solar panel

the latest one. ES Plus series. first STD then while holding shift button press ENG twice then release shift.

 

[Suchal Riaz]

Also one more tip:
Esters formed with alcohol and carboxylic acid are detected by their sweet smell.

mostly

 

[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????

Yes I am very sure that I didn't mention opposite
CH3COOH + C2H5OH ---> CH3COOC2H5 + H2O
You can check on google for esterification.

 

[robinhoodmustafa]

the latest one. ES Plus series. first STD then while holding shift button press ENG twice then release shift.

Yep..
I got it..Thaaank you soo much

 

[passion hunter]

not a tip but i found it on xtremepapers.......dont rely on guess paper though but it revises your concepts....if you dont know the answers try google....

 

[Saad Mughal]

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

Naming the apparatus?
Just know,
Titrating flask - Your normal everyday flask.
To measure 25 cm^3, 50cm^3 accurately - Pipette.
To measure larger volumes approximately - Measuring cylinder.
To heat, stir, mix solutions - Beaker.
To collect (sometimes) and measure volume of gases - Gas syringe.
For titrating a liquid - Burette.

Precautions:
Use pipette carefully and don't suck in too much.
Carefully pour liquids into beakers/measuring cylinders, don't pour them on your hand.
Make sure you properly close the burette's tap and don't let it run.

That's all that I can think of. Hope that helps.

 

[passion hunter]

wear goggles... make sure you have correct labels on colourless solutions in laboratory...or else boom

 

[Saad Mughal]

not a tip but i found it on xtremepapers.......dont rely on guess paper though but it revises your concepts....if you dont know the answers try google....

I solved the papers from 2003-2008. This guess paper is mostly (almost all of it) from the past papers.

 

[TheStallion-Reborn]

Yes I am very sure that I didn't mention opposite
CH3COOH + C2H5OH ---> CH3COOC2H5 + H2O
You can check on google for esterification.

yup ur rite! the equation is correct but those two oxygen atoms in the center are there because one came from the alcohol after H was gone and the other came from the acid after OH was gone.....

 

[Suchal Riaz]

Naming the apparatus?
Just know,
Titrating flask - Your normal everyday flask.
To measure 25 cm^3, 50cm^3 accurately - Pipette.
To measure larger volumes approximately - Measuring cylinder.
To heat, stir, mix solutions - Beaker.
To collect (sometimes) and measure volume of gases - Gas syringe.
For titrating a liquid - Burette.

Precautions:
Use pipette carefully and don't suck in too much.
Carefully pour liquids into beakers/measuring cylinders, don't pour them on your hand.
Make sure you properly close the burette's tap and don't let it run.

That's all that I can think of. Hope that helps.

and glass rode, dropper or SMALL pipette to transfer ink/mixture into chromatography paper.

 

[Saad Mughal]

and glass rode, dropper or SMALL pipette to transfer ink/mixture into chromatography paper.

Thanks for the info. I didn't know about dropper.

 

[Suchal Riaz]

Thanks for the info. I didn't know about dropper.

no problem. this is how we share knowledge to ensure that everybody gets best grades he can. InShaAllah we will get best grades.

 

[Saad Mughal]

no problem. this is how we share knowledge to ensure that everybody gets best grades he can. InShaAllah we will get best grades.

INSHA ALLAH.