How do you write word equations as chemical equations and balance them correctly??

Question

1. zinc and lead (II) nitrate react to form zinc nitrate and lead

2. aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas

3. potassium metal and chlorine gas combine to form potassium chloride.

4. calcium hydroxide and phosphoric acid react to form calcium phosphate and water.

**for number 1 i started out as Zn + Pb (NO3)2 > Zn(NO3)2 + Pb
did i at least start it off right??

Answer 1

**for number 1 i started out as Zn + Pb (NO3)2 > Zn(NO3)2 + Pb
did i at least start it off right??

Yes! You did a great job! This shows that you know how your polyatomic ions (nitrate = NO3-1) and how to use roman numerals (II). Now just make sure that you have the same number of ions on each side...this is a simple single-displacement rxn, so it is balanced (count #zinc,nitrate and Pb on each side of arrow).

2. aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas

Need to know that Al makes a +3 ion (column 3A) and bromine makes -1 ion...balance to make AlBr3

Need to know that both chlorine and bromine are diatomic gases (di=2), so formulas are Cl2 and Br2. (In order to remember the diatomic molecules, use Brinclhof...Bromine Iodine Nitrogen, Chlorine Hydrogen Oxygen Fluorine)

Write out and balance....

3. potassium metal and chlorine gas combine to form potassium chloride.

Need to know that metals are solids, ie K no charge

See about gases above

4. calcium hydroxide and phosphoric acid react to form calcium phosphate and water.

Need to know that Ca makes +2 ion (column 2A) and hydroxide is (OH)-1

Need to know acids and their salts: phosphoric acid (H3PO4), phosphate (PO4)-3

Take your time, and do lots of practice....remember that Chem is try!

Answer 2

1) Zn + Pb(NO3)2 --------> Zn(NO3)2 + Pb
2) 2AlBr3 + 3Cl2 ------------> 2AlCl3 + 3Br2
3) 2K + Cl2 ------------> 2KCl
4) 3Ca(OH)2 + 2H2PO4 -----------> Ca3(PO4)2 + 6H2O

See first see what r the elements and compounds in the reaction and write them down (u have to know the symbols of the elements having the atomic no 1-20 by heart, for gcse and igcse sylabus)

Take each element at a time and try to see if each balances on both sides, for example take the second one:
if u take the Cl2 on the reactant side, its not the same on the product side, so we add a 2 in front of the whole compund. This makes K {2} on the product side hence add a 2 in front of K in the reactant side. For all its the same way
You should also know the oxidation states of all. This helps u write compounds correct in symbols if they r ionic compounds.

Answer 3

Zn+Pb(NO3)2--->Zn(NO3)2 +Pb

2AlBr3 +3Cl2---> 2AlCl3+ 3Br2

2K+Cl2--->2KCl

3Ca(OH)2+ H3PO4 Ca3PO42 + 3H2O

Answer 4

Uh, I'm not exactly sure.....If I were you I would Google the answers. Sorry!