how can we tell if a reaction takes place?. there are four clues: 1. _______________ 2....
TRANSCRIPT
How can we tell if a reaction takes
place?
How can we tell if a reaction takes place?
There are four clues:
1. _______________
2. _______________
3. _______________
4. _______________
How can we tell if a reaction takes place?
There are four clues:
1. Heat or light is given off
2. _______________
3. _______________
4. _______________
How can we tell if a reaction takes place?
There are four clues:
1. Heat or light is given off
2. A gas is produced
3. _______________
4. _______________
How can we tell if a reaction takes place?
There are four clues:
1. Heat or light is given off
2. A gas is produced
3. A precipitate forms
4. _______________
How can we tell if a reaction takes place?
There are four clues:
1. Heat or light is given off
2. A gas is produced
3. A precipitate forms
4. A change in color occurs
Type of Reactions
Chemical reactions are classified into six general types
Synthesis
Synthesis
Two or more elements or simple compounds combine to form (synthesize) one product
A + B AB
2Mg + O2 2MgO
2Na + Cl2 2NaCl
SO3 + H2O H2SO4
Type of Reactions
Chemical reactions are classified into six general types
Synthesis
Decomposition
Decomposition
One substance is broken down (split) into two or more simpler substances.
AB A + B
2HgO 2Hg + O2
2KClO3 2KCl + 3 O2
Types of Reactions
Classify the following reactions as
1) synthesis or 2) decomposition:
___A. H2 + Br2 2HBr
___B. Al2(CO3)3 Al2O3 + 3CO2
___C. 4 Al + 3C Al4C3
Solution
Classify the following reactions as
1) combination or 2) decomposition:
_1_A. H2 + Br2 2HBr
_2_B. Al2(CO3)3 Al2O3 + 3CO2
_1_C. 4 Al + 3C Al4C3
Special Decomposition Reactions
Metallic Carbonates decompose to form metallic oxides and carbon dioxide
CaCO3 CaO + CO2
Al2(CO3)3 Al2O3 + 3 CO2
Special Decomposition Reactions
Metallic Hydrogen Carbonates (bicarbonates) decompose to form metallic oxides, carbon dioxide and water2NaHCO3 Na2O + H2O + 2CO2
2 Al(HCO3)3 Al2O3 + 3 H2O + 6 CO2
Special Decomposition Reactions
Metallic Chlorates decompose into metallic chlorides and oxygen
2KClO3 2KCl + 3O2
Ni(ClO3)4 NiCl4 + 6O2
Type of Reactions
Chemical reactions are classified into six general types
Synthesis
Decomposition
Single Replacement
Single Replacement
One element takes the place of an element in a reacting compound.
A + BC AB + C
Zn + 2HCl ZnCl2 + H2
Fe + CuSO4 FeSO4 + Cu
2KI + Cl2 2KCl + I2
Type of Reactions
Chemical reactions are classified into six general types
Synthesis
Decomposition
Single Replacement
Double Replacement
Double Replacement
Two elements in reactants take the place of each other
AB + CD AD + CB
AgNO3 + NaCl AgCl + NaNO3
ZnS + 2HCl ZnCl2 + H2S
Classifying Reactions
Classify the following reactions as
1) single replacement
2) double replacement
__A. 2Al + 3H2SO4 Al2(SO4)3 + 3H2
__B. Na2SO4 + 2AgNO3 Ag2SO4 + 2NaNO3
__C. 3C + Fe2O3 2Fe + 3CO
Solution
Classify the following reactions as
1) single replacement
2) double replacement
1_A. 2Al + 3H2SO4 Al2(SO4)3 + 3H2
2_B. Na2SO4 + 2AgNO3 Ag2SO4 + 2NaNO3
1_C. 3C + Fe2O3 2Fe + 3CO
Type of Reactions
Chemical reactions are classified into six general types
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
Combustion
A reaction in which a compound (most
often carbon) reacts with oxygen
C + O2 CO2
CH4 + 2O2 CO2 + 2H2O
C3H8 + 5O2 3CO2 + 4H2O
C6H12O6 + 6O2 6CO2 + 6H2O
Type of Reactions
Chemical reactions are classified into six general types
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
Neutralization
Neutralization
A reaction in which a base (contains
OH-) reacts with an acid (contains H+)
to produce a salt and water
NaOH + HCl NaCl + H2O
H2SO4 + 2NaOH Na2SO4 + 2H2O
Balancing Equations
Balance the combustion equation
___C5H12 + ___O2 ___CO2 + ___H2O
Solution
Balance the combustion equation
1 C5H12 + 8 O2 5 CO2 + 6 H2O