TEMA PARA LA MATERIA DE QUÍMICA...t/t

1. Types of Chemical
Reactions
QBA Miguel A. Castro Ramírez

2. Objectives For this Lesson
After this lesson you should be able to:
1. Classify a chemical reaction as
composition, decomposition, single
replacement, or combustion.
2. Predict the products of simple
composition and decomposition
reactions.

3. Objectives cont.
3. Use the activity series of metals to
produce the products of single
replacement reactions.
4. Write the products of the double
replacement reaction between two
ionic compounds.

4. 5 Types of
Reactions
• Composition
(synthesis)
• Decomposition
• Single Replacement
• Double Replacement
• Combustion

5. Composition (synthesis)
Reactions
• Two or more substances react to form a
single substance.
• These reactions usually result in the
release of energy.
A+B AB
O
S + O O S O

6. Your Turn
• Write a balanced chemical equation for
the reaction of:
– solid aluminum with sulfur.
– Water and dinitrogen pentoxide.

7. Decomposition Reactions
• A single substance is broken down
into two or more substances.
AB A+B
O
Ca C
O
O Ca O
+ O C O

8. Try These
• Write a balanced chemical equation for
the decomposition of:
– Aluminum oxide.

9. Single Replacement Reactions
• One element displaces another element
from a compound in a single
replacement reaction.
A+ BX AX+B
O O
Cu Fe
Fe
+ O
SO
O
O
SO
O
+ Cu

10. Activity Series
• Whether an element will replace
another depends upon how active the
elements are. A more active element
will replace a less active element.
• See your activity chart to
determine which elements are
more active than others.

11. Solving Single Replacement
Reactions
• Determine what is being replaced, the
metals or nonmetals.
• Look up the elements on your activity
series chart, to see if the reaction will
take place.
• Write the complete skeleton equation,
and balance it.

12. Your Turn
• Write balanced chemical
equations for the reaction of:
– Potassium and Zinc Chloride.
– Chlorine and Hydrofluoric acid.
– Iron and Sodium phosphate.
– Fluorine and hydrochloric acid.

13. Double Replacement
Reactions
• Two ionic compounds exchange
cations and anions.
• Hint: “outsides combine, insides
combine”.
AX+BY AY+BX

14. Ag O K
O
NO + Cl
Ag K O
Cl + O
NO

15. Try these
• Write a balanced chemical equation for
the reaction of
– Lithium iodide and silver nitrate.
– Barium chloride and potassium
carbonate.

16. Combustion Reactions
• A substance burning in oxygen.
• Combustion reactions usually involve
hydrocarbons.
• Complete combustion results in the
formation of water and carbon dioxide.
• Incomplete combustion results in the
formation of soot and carbon
monoxide.

17. Examples
• Write a balanced chemical equation for
the complete combustion of Propane,
C 3 H8
• Write a balanced chemical equation for
the incomplete combustion of Propane.