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View Full Version : [Science]Balencing equations(Grade 10 Science)



Smith
12-02-2004, 11:33 PM
i have a lab report due tommorow, and i can barley keep my eyes open, i was on a feild trip all day, the bus left at 5:30 am. ive been working on it for hours and now ive come down to the questions. i cant remember how to do them because ive missed alot of class because of sport teams. i need this mark because ibe been going down in my course and i need to kepp it above 70
%

*just imagine the big numbers as small ones and not something else. for some reason the font button wont work with Mozilla. So where you see a 2 or a 3. just imagine it as a small number. people who have done this will know what im talking about

Write the preidicted formula and balence where needed.

Here are the questions.
Synthesis
Cu+O2->(blank)
Mg+O2->(Blank)

Decomposition
CuCO3->CO2+(blank)

Single Displacement

Zn+HCl-> H2+(blank)
Zn+CuSO4->Cu+(blank)

Double Displacement

Pb(NO3)2+ KI->KNO3+(blank)

Na2CO3+HCl-> H2O+CO2+(Blank)

i know i should be doing this myself but i dont have the time. i still have shitloads to do and my friends are all out at some rec center thing 2nite.

i will owe anyone who does this a HUGE favor. thanks

Spicker
12-02-2004, 11:38 PM
lol just did this a couple of weeks ago but now in to physics

im too lazy to give u answers sorry
:blushing:

Smith
12-02-2004, 11:44 PM
lol just did this a couple of weeks ago but now in to physics

im too lazy to give u answers sorry
:blushing:


PLEASSSEEEEEEEEEEEEEE

ill give u what ever u want..

gold, money, cars,women..

NikkiD
12-02-2004, 11:45 PM
Oh christ, it's been years since I did chemistry. Give me a few minutes and I'll figure it out.

EDIT: Did I say years? Like 15?

The first formula is Cu2O to balance it, you would have to do:

4Cu + O2 = 2Cu2O

Second one is

MgO to balance:

2Mg + O2 = 2MgO

Working on the rest - I haven't used this part of my brain in way too long. :blink:

Tifosi
12-02-2004, 11:48 PM
You could at least go through each equation and suggest what you think are the correct answers...(e.g. for the first one you could say the RHS should be Cu2O and that it's already balanced...)

Smith
12-03-2004, 12:10 AM
Oh christ, it's been years since I did chemistry. Give me a few minutes and I'll figure it out.


thanks alot

NikkiD
12-03-2004, 12:24 AM
Decomposition
CuCO3->CO2+(blank)


CuCO3 -> CO2 + Cu2O + O2

Balanced:

4CuCO3 = 4CO2 + 2Cu2O + O2

I'm not positive on these so if I'm wrong, please someone tell me.

Tifosi
12-03-2004, 12:24 AM
Oh christ, it's been years since I did chemistry. Give me a few minutes and I'll figure it out.

EDIT: Did I say years? Like 15?

The first formula is Cu2O to balance it, you would have to do:

4Cu + O2 = 2Cu2O

:blink:

:blushing:

I did this at uni not long ago :rolleyes:

NikkiD
12-03-2004, 12:34 AM
Single Displacement

Zn+HCl-> H2+(blank)
Zn+CuSO4->Cu+(blank)


Zn + HCl -> H2 + ZnCl2

Balanced:

Zn + 2HCl -> H2 + ZnCl2

Zn + CuSO4 -> Cu + ZnSO4 - it is balanced.

NikkiD
12-03-2004, 12:45 AM
Double Displacement

Pb(NO3)2+ KI->KNO3+(blank)

Na2CO3+HCl-> H2O+CO2+(Blank)


Pb(NO3)2 + KI -> KNO3 + PbI2

Balanced:

Pb(NO3)2 + 2KI = 2KNO3 + PbI2

Na2CO3 + HCl -> H2O + CO2 + NaCl

Balanced:

Na2CO3 + 2HCl = H2O + CO2 + 2NaCl

TheDave
12-03-2004, 12:47 AM
i feel all stupid now. i used to rule at chemistry :cry:

Smith
12-03-2004, 12:49 AM
Pb(NO3)2 + KI -> KNO3 + PbI2

Balanced:

Pb(NO3)2 + 2KI = 2KNO3 + PbI2

Na2CO3 + HCl -> H2O + CO2 + NaCl

Balanced:

Na2CO3 + 2HCl = H2O + CO2 + 2NaCl


thanks a million

NikkiD
12-03-2004, 12:52 AM
No probs - brought back some old memories. :lol:

Rick Phlegm
12-03-2004, 12:54 AM
You can do my homework as well if you like.

It involves animating a badly modelled 3D man :(

NikkiD
12-03-2004, 01:03 AM
You can do my homework as well if you like.

It involves animating a badly modelled 3D man :(

I think you're on you're own there... :unsure:

I'm currently re-teaching my 11 year old son geometry. I don't know how they expect kids to understand area and perimeter the way they teach it. :angry:

manker
12-03-2004, 01:08 AM
I did Chemistry at school, maybe 10 years ago, and recall doing those equations. I could never have remembered how to do them like that.

Nice one, Nikki :beerchug:

NikkiD
12-03-2004, 01:16 AM
Thank you :)

My brain hurts. I need to lie down now. :wacko:

Spicker
12-03-2004, 02:17 AM
:blushing:

I did this at uni not long ago :rolleyes:
omg ur doing this at uni while we are doing this crap in GRADE 10!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1 :angry: :angry: :angry: :angry: :angry: :angry: :angry: :angry: :angry:


if u think this is hard u gotta see ACADEMIC gr.10 or 11 math...thats where u go ku koo :1eye:

skool sux0rz

Tifosi
12-03-2004, 02:25 AM
omg ur doing this at uni while we are doing this crap in GRADE 10!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1 :angry: :angry: :angry: :angry: :angry: :angry: :angry:


if u think this is hard u gotta see ACADEMIC gr.10 or 11 math...thats where u go ku koo :1eye:

skool sux0rz


:lol:

When I said doing "this", I didn't mean balancing equations, I meant chemistry. A university course in chemistry is a lot harder than this stuff :lol:

I don't do chemistry any more :no: , hence my stupidity above

Jon L. Obscene
12-03-2004, 03:12 PM
I never did chemistry, we made moonshine and swaped the gas and water hoses, then I spent my last 2 terms being sent to the headmasters office for stuff other people did :dry:

So this thread might as well be japanese :ermm:

Altho Japanese is easier to learn :ph34r:

Jonno :cool:

exo_body
12-03-2004, 04:11 PM
well done nikid.
@ theCanuk - were you not taugh about valency at all? once you know that equations are easy as hell. if you werent taught anything about valancy, look it up. takes 10 minutes to learn and you'll never have a problem with an equation like that again