Balancing chemical equations.. HELP?
1. Magnesium metal (Mg(s)) burns brightly in oxygen gas (o2(g)) to produce a whitish-grey powder, magnesium oxide (MgO(s)). Write a balanced chemical equation for this reaction.
2. Magnesium metal (Mg(s)) will also react with copper ion in solution (Cu+2(aq)) to form magnesium ions in solution (Mg+2(aq)) and copper metal (Cu(s)). Write a balanced chemical equation for this reaction.
3. A solution of sodium carbonate (Na2CO3(aq)) will react with a solution of calcium chloride (CaCl2(aq)) to produce the solid precipitate, calcium carbonate (CaCO3(s)) and a solution of sodium chloride (NaCl(aq)). Write a balanced chemical equation for this reaction.
These are extra practice problems and I am so lost. Please help.
- Lexi RLv 76 years agoFavorite Answer
from the problem, pick out the reagents and products
Mg(s) + O2(g) ----> MgO(s)
balance the atoms, there are 2 O atoms on the Left hand side of the arrow and only 1 on the right hand side. Put a 2 in front of the MgO
Mg(s) + O2(g) ----> 2MgO(s)
this has unbalanced the Mg, so place a 2 in from of the Mg on the LHS to equalise it
2 Mg(s) + O2(g) ----> 2 MgO(s)
Now it is balanced.
remember that you can only balance equations by placing numbers in front of compounds
Mg(s) + Cu^2+(aq) ---> Mg^2+(aq) + Cu(s)
Na2CO3(aq) + CaCl2(aq) ---> CaCO3(s) + 2NaCl(aq)