Chapter 8 Chemical Equations !

Word Equation – the names of the substances are given in words for you to interpret.

Zinc plus Hydrochloric Acid yields Zinc chloride plus Hydrogen gas !

REACTANTS PRODUCTS

Interpreting chemical equations

Al (OH)3 + 3HCl AlCl3 + 3 H2O

SO WHAT DOES THIS MEAN????

One formula unit of aluminum hydroxide

Reacts with 3 molecules of HCl

To make one FU of aluminum chloride

And three molecules of water

Ions in water solution

When ionic substances dissolve in water their crystal lattice structure breaks up and they exist as IONS in water !

NaCl yields Na + plus Cl -

KCl yields K+ plus Cl-

Ionic equations and spectators !

• Ionic equations simply show what is happening to the ions taking part in a reaction.

• Spectator ions are those which do not actually participate in the reaction.

• See solubility chart page 860

Write the NET ionic equation which occurs when aqueous solutions of

zinc chloride and potassium hydroxide react.

ZnCl2 (aq) + 2 KOH (aq) Zn (OH)2(s) + 2 KCl(aq)

Zn+2 + 2Cl-1 + 2K+ + 2OH-

Zn(OH)2(s) + 2K+ + 2Cl-

Zn+2 + 2OH- Zn(OH)2(s)

Predict the products

When K reacts with MgF 2 Mg + KF

When Mg reacts with KF NO REACTION

Predict the products

NaOH + KCl

NaNO + KBr3

Ammonium Carbonate +

Magnesium Chloride

Magnesium carbonate as precipitate and ammonium ions and chloride ions as spectators