Reaction+Three+Single+DIsplacement

__**Single-Displacement Reactions**__, aka Replacement Reactions --> When one element replaces a similar element in a compound. A+ BX --> AX+ B or Y+ BX --> BY+ X

__Sentence Form of Reaction:__

Zinc and Hydrogen Chloride react to form Zinc Chloride and Hydrogen Gas.

__Conversion to Reaction:__

1) The symbols of each reactant and product in the reaction are to be written.

Zn + HCl --> ZnCl + H2 ; The idea of this reaction is that Zinc replaces Hydrogen in the compound with Chlorine.

2) The next thing that needs to be done is to find the charges of each element. The charge of Zinc is -2, the charge of the rest of the elements is + or - 1.

3) The "Switcheroo Method" is what comes into play in the next step, being involved with using the charges found in the last step.

Zn + HCl --> ZnCl2 + H2 ; The Hydrogen gets a subscript 2 because of it being a gas and considered a diatomic atom.

__Balancing the Equation:__

4) The last step is to balance the equation while looking at each element on both sides of the equation. First you should look at the Two atoms of hydrogen on the right side of the equation, and get an equal amount on the opposite side. So put a coefficient 2 in front of the HCl on the left side of the equation. Zn + 2 HCl --> ZnCl2 + H2 Because of the coefficient 2 in front of the HCl, you now have two atoms of Cl on the left side and that makes the amount of Cl on each side equal.


 * Zn + 2 HCl --> ZnCl2 + H2** > The final formula for this Single-Displacement Reaction.

Page By Matt Killeen.