[Science]Balencing equations(Grade 10 Science)

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

lol just did this a couple of weeks ago but now in to physics

im too lazy to give u answers sorry
:blushing:

Quote:

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Originally Posted by jaigandhi5

lol just did this a couple of weeks ago but now in to physics

im too lazy to give u answers sorry
:blushing:

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PLEASSSEEEEEEEEEEEEEE

ill give u what ever u want..

gold, money, cars,women..

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:

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...)

Quote:

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Originally Posted by NikkiD

Oh christ, it's been years since I did chemistry. Give me a few minutes and I'll figure it out.

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thanks alot

Quote:

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Originally Posted by TheCanuk

Decomposition
CuCO3->CO2+(blank)

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CuCO3 -> CO2 + Cu2O + O2

Balanced:

4CuCO3 = 4CO2 + 2Cu2O + O2

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

Quote:

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Originally Posted by NikkiD

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:

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:blushing:

I did this at uni not long ago :rolleyes:

Quote:

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Originally Posted by TheCanuk

Single Displacement

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

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Zn + HCl -> H2 + ZnCl2

Balanced:

Zn + 2HCl -> H2 + ZnCl2

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

Quote:

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Originally Posted by TheCanuk

Double Displacement

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

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

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

Balanced:

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

Na2CO3 + HCl -> H2O + CO2 + NaCl

Balanced:

Na2CO3 + 2HCl = H2O + CO2 + 2NaCl

i feel all stupid now. i used to rule at chemistry :cry:

Quote:

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Originally Posted by NikkiD

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

Balanced:

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

Na2CO3 + HCl -> H2O + CO2 + NaCl

Balanced:

Na2CO3 + 2HCl = H2O + CO2 + 2NaCl

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thanks a million

No probs - brought back some old memories. :lol:

You can do my homework as well if you like.

It involves animating a badly modelled 3D man :(

Quote:

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Originally Posted by Rick Phlegm

You can do my homework as well if you like.

It involves animating a badly modelled 3D man :(

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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:

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:

Thank you :)

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

Quote:

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Originally Posted by Tifosi

:blushing:

I did this at uni not long ago :rolleyes:

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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

Quote:

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Originally Posted by jaigandhi5

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

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: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

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:

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