1. Translating Chemical Reactions to Equations
Chemistry Reg & GT 2/5/14

2. Drill
Translate the following sentence into an equation, with all states shown.
Aluminum oxide crystals decompose when heated to form aluminum metal and oxygen gas.
HW: pg. 4 – From Words to Equations
Don’t worry about balancing!

3. Objectives
IWBAT
Write a chemical equation, using the correct chemical formulas for compounds, and symbols for all of the states of the substances, if given.

4. Writing Equations Do you remember the diatomic elements? HIFNOBrCl
BrO FINClH
Hockey Stick & Puck
Example:
Sodium metal is added to water. Hydrogen gas bubbles off, and sodium hydroxide is left behind, in solution.
Step 1:
Put text into word equation:
Sodium + water  hydrogen + sodium hydroxide
Step 2:
Translate words in word equation to formulas
Na + H2O  H2 + NaOH
Step 3:
Add symbols to tell states of reactants and products.
Na(s) + H2O(l)  H2(g) + NaOH(aq)

5. Law of Conservation of Mass
Mass cannot be lost or gained in a chemical reaction
ALSO, the total mass of the reactants must equal total mass of the products
Therefore, the NUMBER of each type of atom on each side of the equation MUST be the same!

6. Practice Go back to pg. 1 Let’s review Part 1 & 2 Work on Part 3
Write the word equation on the first line
Write an unbalanced equation on the second line
Skip step c) for now
HW Review – pg. 3 questions on boards

7. Translation Practice Guide
HgO (s) Hg (l) + O2 (g)
Na(s) + H2O(g)  NaOH(s) + H2(g)
ZnS (s) + O2 (g) ZnO (s) + SO2(g)
ZnO (s) + C (s) Zn (g) + CO (g)
SO3 (g) + H2O (g)  H2SO4 (aq)
CaCO3(s)+HCl(aq)CaCl2(aq)+CO2(g)+H2O(l)

8. Closure Change these names to formulas. Dinitrogen monoxide
Potassium sulfide
Copper (II) nitrate
Dichlorine heptoxide
Chromium (III) sulfate
Iron (III) sulfite
Calcium oxide
Barium carbonate
Iodine monochloride