chemistry balance equations test review

1. 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

2. Chemical Equations !
Zinc plus Hydrochloric Acid yields Zinc chloride plus Hydrogen gas
Zn(s) + HCl(aq)  ____ + ____

3. Chemical Equations !
Zinc plus Hydrochloric Acid yields Zinc chloride plus Hydrogen gas
Zn(s) + HCl(aq)  ____ + ____

4. Chemical Equations !
Zinc plus Hydrochloric Acid yields Zinc chloride plus Hydrogen gas
Zn(s) + HCl(aq)  ____ + ____

5. Chemical Equations !
Zinc plus Hydrochloric Acid yields Zinc chloride plus Hydrogen gas
Zn(s) + 2HCl(aq) ____ + ____

6. 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

7. 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-

8. 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

9. Write the full and NET ionic
equation which occurs when
aqueous solutions of zinc fluoride
and potassium carbonate react.
ZnF2 (aq) + K2CO3 (aq) Zn CO3(s) + 2 KF(aq)
Zn+2 + 2F-1 + 2K+ + CO3
-2 ZnCO3 (s) + 2K+ + 2F-
Zn+2 + CO3
-2 ZnCO3 (s)

10. Predict the products
When K reacts with MgF2
Mg + KF
When Mg reacts with KF NO REACTION

11. Predict the products(assume reactants are aqueous)
NaOH + KCl
NaNO + KBr3
Ammonium Carbonate +
Magnesium Chloride
Magnesium carbonate as
precipitate and
ammonium ions and
chloride ions as
spectators

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