Write the word equations as chemical equations and balance aluminum bromide and chlorine gas react to form aluminum chloride bromine gas?

Answer 1

aluminum bromide = AlBr3

the reason why there is 3 Br atoms is that aluminum is in group 3

chlorine gas exists as a diatomic Cl2 molecule

AlBr3 + Cl2 <------> AlCl3 + Br2

this type of reaction is a subsitiution reaction where chlorine and bromine ate both group 7 gas's and are interchangable

to balance this you'll notice that we lose 2 Br atoms, but have 3 at the start. This can look a bit confusing, so we need a number that both 3 and 2 go into to balance the Br atoms

These both go into 6 so if we use 2AlBr3 that gives us 6 Br on the left hand side and if we generate 3 Br2 on the right hand side we have the bromines balanced

now we've balanced the bromines, you noticed that we unbalanced the Al, so, to balance them again we need to form 2 AlCl3 on the right hand side and the Al is balanced

finally, by balancing the Al we unbalanced the Cl

there are 6 Cl on the right hand side but only 2 on the left hand side, so if we use 3 Cl2 on the left hand side then we have balanced the Cl's

your complete equation looks like this;

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