[Science]Balencing equations(Grade 10 Science)

[Smith]

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]

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

im too lazy to give u answers sorry

[Smith]

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

im too lazy to give u answers sorry

PLEASSSEEEEEEEEEEEEEE

ill give u what ever u want..

gold, money, cars,women..

[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

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.

[Tifosi]

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]

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

thanks alot

[NikkiD]

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]

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

I did this at uni not long ago

[NikkiD]

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]

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