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Hi I'm Rid and hi. I do random vlogs, do check them out.

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Extreme late updateeeee. D:
Tuesday, February 12, 2008 4:28 AM
Sorry, people.
Seriously busy nowadays lor.
Chemistry and Maths are driving me crazy.

Anyways, I'll just post some questions on Chem,
in case you feel like trying out. :)
Answers will be provided at the end of the post,
so you can kinda... check your answers! :
Have fun torturing yourselves, people. *Smirks*

Relax, it's simple questions. (Really!) :S
LOL!
Get ready your pens and papers!



Chemistry Paper.
Secondary 3E

Instructions:
1. At any point of time,
you may use a scientific calculator and a periodic table to guide you.
2. There are 10 questions in all. (Including parts a,b,c.. etc.)
3. Marks may be penalized for accuracy and units.
4. Please leave your final answers to 3 significant figures, if necessary.
5. The total marks for this paper is 20. Marks are indicated at the end of each question.

You may begin now,

scroll down and have 'fun'. :)
Don't cheat alright? :S

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Important clues:
1. 1mol = 6 x 10 to the power of 23 particles.
2. At r.t.p, 1mol of gas occupies 24dm3.


Q1. Rewrite these word equations into chemical equations:


a) Iron(III) oxide + carbon monoxide -> iron + carbon dioxide [1m]
b) Sodium hydroxide + sulphuric acid -> sodium sulphate + water [1m]
c) Carbon dioxide + carbon -> carbon monoxide [1m]


Q2. Calculate:

a) the number of moles of 0.54g of carbon atoms. [2m]
b) the mass of 0.76mols of bromine molecules,Br2. [2m]
c)the number of atoms in 17.5g of ammonium chloride. [2m]


Q3. 9.12mol of diatomic gas has the same mass as 0.5mol of hydrogen chloride.
Identify this gas. [3m]


Q4. A sample of oxide of copper contains 8 g of copper combined with 1 g of oxygen. Find the empirical formula of the compound. [3m]


Q5. The empirical formula of a compound is COH3. Its relative molecular mass is 62. Find the molecular formula. [3m]


Q6.
Calculate the volume of 7 g of nitrogen, N2 at r.t.p.
(At r.t.p, 1mol of gas occupies 24dm3.) [2m]


The end. :)

Have you checked your answers?

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Hahahaaaaa!!!!!!!!
Quite difficult right? LOL.
Anyways, here are the answers to the questions. :)


Answers! :)

Q1.
a) Fe2O3 + 3CO -> 2Fe + 3CO2
b) 2NaOH +H2SO4 -> NA2SO4 + 2H2O
c) CO2 + C -> 2CO

Q2.
a) 0.045mol
b) 121.6 g
c) 1.18 x 10 to the power of 24.

Q3.
Ans: Hydrogen.

Q4.
Ans: Cu2O

Q5.
Ans: C2O2H6

Q6.
Ans: 6dm3.

Don't understand?
Email me or tag me at the tagboard.
I'll tell you the solutions. :) :)



AHHHH.
SO TIRED.
Guess I'll just end this post,<3
Sorry people. :(

Oh yeah, thanks dear for the subsequent updates!
:):) I'll update if I've the time, alright?


P.S. Dear, get well soon, i love you.
Muacks. :)


ANDDDDD,

Imelddddaaa's
Signing off.

Fcuk. :( Stomach cramp! AHHHHH *cries*

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