1. Symbolic Language of Chemistry
Evidence for Chemical Change (Check physical/chemical change worksheet)
Symbolic Language of Chemistry
Symbols represent….
Formulas represent…
Equations represent…

2. Station 1: Burning Candle
Chemical Equation
C20H42+ O2  CO2 + H2O
The equation says nothing about the existence of a flame.
Reactants
Products
Arrow acts as an equal sign. You read it as “yields”, “makes” or “produces”

3. Station 2: Sodium Nitrate and Water
NaNO  Na+ + NO3-
Endothermic – heat is absorbed. It gets colder
Station 4: Calcium Chloride and water
Water
CaCl  Ca Cl-
Exothermic – Heat is released it gets warmer.

4. Station 5: Magnesium and Hydrochloric acid
Effervescence – production of tiny bubbles.
Mg + 2 HCl  MgCl2 +H2
Station 7: Zinc and Hydrochloric acid
Zn + 2 HCl  ZnCl2+ H2
The equation tells you nothing on how fast the reaction happens
Coefficients are used to make the number of atoms in the products equal the number of atoms in the reactants.

5. Station 6: Potassium Iodide and Hydrogen peroxide
Chemical above the arrow is a catalyst – something that lowers the energy necessary to start a reaction, but is not changed with the reaction KI
2H2O  O2+ 2H2O

6. Station 3: Copper Sulfate and Barium Nitrate
CuSO4 (aq)+ Ba(NO3)2(aq) Cu(NO3)2 (aq) + BaSO4(s)
s = solid
l = liquid
g = gas
aq = aqueous – in water
Letters in parenthesis tell you the state of matter that the reactants and products are in.
Precipitate – a solid forms that is not able to dissolve in water

7. Station 8 and 9
Bromothymol Blue and Carbon dioxide
Bromothymol Blue and Sodium Carbonate
Carbon Dioxide makes carbonic acid changing the color to yellow.
Sodium carbonate neutralizes the acid making it more basic and changes the color back to blue

8. Station 8 and 9 Yellow Blue
Bromothymol Blue and Carbon dioxide
Bromothymol Blue and Sodium Carbonate
Yellow
Blue
For some reactions it makes more sense to show the structure rather than the formula.

9. Chemical Equations Represent Chemical reactions
Tells you the ratios of what goes in and what comes out.
Can tell you the reactant and product’s state of matter
Can tell you if there is a catalyst involved
Cannot tell you the change in energy or the rate of the reaction.

10. Type of Reaction Definition Equation Synthesis (divorce)
(marriage)
 Two or more elements or compounds combine to make a more complex substance
______ +______  ______
Decomposition
(divorce)
Compounds break down into simpler substances
______  ______ + ______   
Single Displacement
(Cheating)
Occur when one element replaces another one in a compound
______ + ______  ______ + ______
Double Displacement
(wife swap)
Occurs when different atoms in two different compounds trade places
Combustion
Occurs when a hydrocarbon reacts with oxygen to produce water and carbon dioxide.

11. Classifying Reactions
Addition (synthesis) - A + B  AB
Marriage - 2H2 +O2  2H2O
Decomposition - AB  A + B
Divorce - 2H2O  2 H2 +O2
Single displacement - AB + C  AC + B
Cheating Spouse - 2AlBr3 + 3Cl2  2AlCl3 + 3Br2
Double displacement – AB + CD  AD + CB
Wife Swap – 2 AlBr3+ 3HgCl2 2AlCl3 +3 HgBr2
Combustion – Odd man out
CxHX + O2  CO2 + H2O

12. What type of reaction? SeCl6 + O2  SeO2 + 3Cl2 A.) Synthesis
iRespond Question
Multiple Choice F
SeCl6 + O2  SeO2 + 3Cl2
A.) Synthesis
B.) Decomposition
C.) Single Replacement
D.) Double Replacement
E.) Combustion

13. What type of reaction? H2O2  H2 + O2 A.) Synthesis B.) Decomposition
iRespond Question
Multiple Choice F
H2O2  H2 + O2
A.) Synthesis
B.) Decomposition
C.) Single Replacement
D.) Double Replacement
E.) Combustion

14. What type of reaction? 2 Na + Cl2 2 NaCl A.) Synthesis
iRespond Question
Multiple Choice F
2 Na + Cl2 2 NaCl
A.) Synthesis
B.) Decomposition
C.) Single Replacement
D.) Double Replacement
E.) Combustion

15. What type of reaction? Na2CO3  Na2O + CO2 A.) Synthesis
iRespond Question
Multiple Choice F
Na2CO3  Na2O + CO2
A.) Synthesis
B.) Decomposition
C.) Single Replacement
D.) Double Replacement
E.) Combustion

16. What type of reaction? Pb + O2  PbO2 A.) Synthesis B.) Decomposition
iRespond Question
Multiple Choice F
Pb + O2  PbO2
A.) Synthesis
B.) Decomposition
C.) Single Replacement
D.) Double Replacement
E.) Combustion

17. What type of reaction? CH4 + 2 O2  CO2 + 2 H2O A.) Synthesis
iRespond Question
Multiple Choice F
CH4 + 2 O2  CO2 + 2 H2O
A.) Synthesis
B.) Decomposition
C.) Single Replacement
D.) Double Replacement
E.) Combustion

18. What type of reaction? NaOH + KNO3 --> NaNO3 + KOH A.) Synthesis
iRespond Question
Multiple Choice F
NaOH + KNO3 --> NaNO3 + KOH
A.) Synthesis
B.) Decomposition
C.) Single Replacement
D.) Double Replacement
E.) Combustion

19. What type of reaction? Pb(NO3)2 + 2 KI  PbI2 + 2 KNO3 A.) Synthesis
iRespond Question
Multiple Choice F
Pb(NO3)2 + 2 KI  PbI2 + 2 KNO3
A.) Synthesis
B.) Decomposition
C.) Single Replacement
D.) Double Replacement
E.) Combustion

20. What type of reaction? Fe + H2SO4  Fe2(SO4)3 + H2 A.) Synthesis
iRespond Question
Multiple Choice F
Fe + H2SO4  Fe2(SO4)3 + H2
A.) Synthesis
B.) Decomposition
C.) Single Replacement
D.) Double Replacement
E.) Combustion

21. What type of reaction? Mg + 2 H2O  Mg(OH)2 + H2 A.) Synthesis
iRespond Question
Multiple Choice F
Mg + 2 H2O  Mg(OH)2 + H2
A.) Synthesis
B.) Decomposition
C.) Single Replacement
D.) Double Replacement
E.) Combustion

22. What type of reaction? 8 Fe + S8  8 FeS A.) Synthesis
iRespond Question
Multiple Choice F
8 Fe + S8  8 FeS
A.) Synthesis
B.) Decomposition
C.) Single Replacement
D.) Double Replacement
E.) Combustion