Easy Chem help

[vexx]

What's a good calc for chem.... cause i have the casio classpad for methods which is great but i have been told i cant use that one in the chem exams

i think/heard from others/been told by the teacher that the SHARP Scientific Calculators are the best for chem/accounting. i have the:
"Sharp EL-531WH - Advanced D.A.L."

[fady_22]

Yeah, you can't use the casio classpad (or any other graphics calculators). You have to use a scientific calculator in the exam (this is also the case with physics and accounting).

[fady_22]

What's a good calc for chem.... cause i have the casio classpad for methods which is great but i have been told i cant use that one in the chem exams

i think/heard from others/been told by the teacher that the SHARP Scientific Calculators are the best for chem/accounting. i have the:
"Sharp EL-531WH - Advanced D.A.L."

I use the Texas Instruments TI-30XB. Its better than the sharp in my opinion.

[andy456]

Whats the difference between a graphics calc and a scientific one???

[Potter]

You'll find it really helps in MC exam questions. I think 90% of the time SLC(298k, 101.3kPa) is used in questions. I've rarely seen STP(273K, 101.3kPa).

You can save things in the graphics/CAS.

I use a Casio Fx-82AU. Pretty good calculator and it has been very reliable.

[superflya]

u can also install apps on a graphics calc, ive got this pretty sweet app for chem.
best way to keep ur answers as accurate as possible is to use the store function on the calculator and recall the value whenever u need it again. This way, u can simply round off after u have completed ur calculations and almost every scientific calculator should be able to do this.

[kyzoo]

You can save things in the graphics/CAS.

You can save things in a scientific calculator as well, just that there are a lot more "slots" on a graphics calculator.

Also graphics calculators can generate graphs, run installed programs, and contains many more functions than a scientific calculators.

[Potter]

You can save things in the graphics/CAS.

You can save things in a scientific calculator as well, just that there are a lot more "slots" on a graphics calculator.

Also graphics calculators can generate graphs, run installed programs, and contains many more functions than a scientific calculators.

Sorry, I meant you can save things like apps, formulas, etc..

[andy456]

Aight got another question....

An impure sample of iron(II)sulfate, weighing 1.545g, was treated to produce a precipitate of Fe2O3. If the mass of the dried precipitate was 0.315g, calculate the percentage of iron in the sample.

[xD_aQt]

Aight got another question....

An impure sample of iron(II)sulfate, weighing 1.545g, was treated to produce a precipitate of Fe2O3. If the mass of the dried precipitate was 0.315g, calculate the percentage of iron in the sample.

[fady_22]

n(Fe203)=m/mr
            =.315/159.7
            =1.97*10^-3 mol
n(Fe3+)=1.97*10^-3*2
           =3.94*10^-3 mol

m(Fe3+)=n*mr
            =3.94*10^-3*55.85
            =.22g

% Fe in sample= .22/1.545*100
                     = 14.3%

[naved_s9994]

What's a good calc for chem.... cause i have the casio classpad for methods which is great but i have been told i cant use that one in the chem exams

i think/heard from others/been told by the teacher that the SHARP Scientific Calculators are the best for chem/accounting. i have the:
"Sharp EL-531WH - Advanced D.A.L."

I use the Texas Instruments TI-30XB. Its better than the sharp in my opinion.

Also TI-82 AU does same as TI-30XB, but it is also cheaper. (Only by $5 or so?)

[andy456]

Hey, i need help with another question..

A 2.203g sample of an organic compound was extracted from a plant. When it was burned in oxygen, the hydrogen in the compound was converted to 1.32g of water and the carbon was oxidised to 3.23g of carbon dioxide.
What is the empirical formula of the compound??

Thanks

[xD_aQt]

Hey, i need help with another question..

A 2.203g sample of an organic compound was extracted from a plant. When it was burned in oxygen, the hydrogen in the compound was converted to 1.32g of water and the carbon was oxidised to 3.23g of carbon dioxide.
What is the empirical formula of the compound??

Thanks

[Studyinghard]

Hey, i need help with another question..

A 2.203g sample of an organic compound was extracted from a plant. When it was burned in oxygen, the hydrogen in the compound was converted to 1.32g of water and the carbon was oxidised to 3.23g of carbon dioxide.
What is the empirical formula of the compound??

Thanks

I remember doing this question. Is this heineman textbook ?