# Homework Help: Balancing Equations

1. Oct 12, 2005

### shikagami

I don't know if I solved this problem correctly.

Balance the equation:

CO2+ Mg -> MgC + O2

Is this the right end result and can someone help me figure out the state of matter for each.

2. Oct 12, 2005

### Moonbear

Staff Emeritus
It's hard to know if it's the right end result if we don't see what you started with. Please show/explain your reasoning first.

3. Oct 12, 2005

### shikagami

well... the problem only gave me the first part of the equation which was the CO2 + Mg. This is the chemical process that occurs when dry ice is mixed with burning Magnesium pellets, which creates this fire work type of reaction. I figured that the magnesium and carbon will combine and release oxygen.

Last edited: Oct 12, 2005
4. Oct 12, 2005

### shikagami

The actual question is Mg reacts with CO2 (Carbon dioxide) to give a white solid and a black solid. Provide the balanced equation for this reaction.

5. Oct 12, 2005

### stmoe

http://www.chem.umn.edu/services/lecturedemo/info/Magnesium_and_dry_ice.html [Broken]

Is it really as simple as carbon dioxide and magnesium?

Last edited by a moderator: May 2, 2017
6. Oct 12, 2005

### shikagami

I didn't think that Magnesium would combine with oxygen... thnx stmoe.

7. Oct 12, 2005

### Gokul43201

Staff Emeritus

1. The existence of something like MgC would require Mg to have a +4 oxidation state or C to have a +2 oxidation state. Both are extremely rare.

2. You want two solid products. You have one solid and one gas.

Anyway, the correct answer is posted by stmoe.

8. Oct 12, 2005

### Gokul43201

Staff Emeritus
Well, what do you think happens when a magnesium ribbon burns in air ? It is among the most spectacular and violent oxidations you'll ever see !