Word Equations

Write the word equations below as chemical equations and balance.

Those are my teachers instructions. I have tried my best to do these equations. I have already done most of them and I think they are all wrong. I need help with four of them.

1. Aluminum bromide + chlorine yield aluminum chloride + bromine

2. Potassium chlorate when heated yields ptassium chloride + oxygen gas

3. Calcium hydroxide + phosphoric acid yield calcium phosphate + water

4. hydrogen + nitrogen monoxide yield water + nitrogen

PLEASE HELP with at least these four. I have no idea on what I'm doing I desprately need a tutor.

Quote:

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Originally Posted by vgysn

1. Aluminum bromide + chlorine yield aluminum chloride + bromine

2. Potassium chlorate when heated yields potassium chloride + oxygen gas

3. Calcium hydroxide + phosphoric acid yield calcium phosphate + water

4. hydrogen + nitrogen monoxide yield water + nitrogen

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All you really need to do is to look up the chemical formulas for these, and then balance the equations.

Aluminum Bromide = AlBr3
Chlorine = Cl2
Bromine = Br2
Aluminum Chloride
Potassium Chlorate = KClO3
Potassium Chloride = KCl
Oxygen gas = O2
Calcium Hydroxide = Ca(OH)2
Phosphoric acid = H3PO4
Calcium Phosphate = Ca3(PO4)2
Hydrogen = H2
Nitrogen Monoxide = NO
Water = H2O
Nitrogen = N2

Now, for the first equation, start by writing down, chemically, what was said in words -- like this:

AlBr3 + Cl2 = AlCl3 + Br2

Note that on the left you have 1 aluminum atom, three bromine atoms, and two chlorine atoms. On the right you have one aluminum atom, three chlorine atoms and two bromine atoms. The aluminums look OK, but the chlorine and bromines do not. In order to balance the bromines, multiply the Br2 on the right by 1.5 and the Cl2 on the left by 1.5

AlBr3 + 1.5 Cl2 = AlCl3 + 1.5 Br2

The equation is now balanced. However, most people like whole numbers. So, multiply everything by 2

2 AlBr3 + 3 Cl2 = 2 AlCl3 + 3 Br2

Everyone is happy -- including your teacher.

You give a try with the other three and post the results. If you have trouble, I'll give you another push.