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Chemical Reactions
Reaction Basics
Balance
Balance and Classify
Balance and Classify (Pt 2)
100
What is the law of conservation of mass?
Mass cannot be created or destroyed
100
When energy is released from a chemical reaction, its is considered part of the ___________________.
products
100
KClO3 --> KCl + O2
2KClO3 --> 2KCl + 3O2
100
Al + O2 --> Al2O3
4Al + 3O2 --> 2Al2O3 Synthesis
100
C8H18 + O2 --> CO2 + H2O
2C8H18 + 25O2 --> 16CO2 + 18H2O Combustion
200
How do you know a chemical reaction occurred?
Release energy as heat or light, produce sound, change temp, change in electrical energy, forms a gas, precipitate, or change in color/odor
200
When energy is absorbed in a chemical reaction, it is considered part of the ____________________
reactants
200
H2O + Fe --> Fe2O3 + H2
3H2O + 2Fe --> Fe2O3 + 3H2
200
Mg + Zn3(PO4)2 --> Mg3(PO4)2 + Zn
3Mg + Zn3(PO4)2 --> Mg3(PO4)2 + 3Zn Replacement Reaction
200
Ag2O --> Ag + O2
2Ag2O --> 4Ag + O2 Decomposition
300
Why is the change of state a physical change and not a chemical change?
Because the properties of the new substance after the reaction must be different than the properties of the original substance
300
What does a two way arrow mean?
the reaction can be reversed
300
AlCl3 --> Al + Cl2
2AlCl3 --> 2Al + 3Cl2
300
Al2(SO4)3 + Ba(OH)2 --> Al(OH)3 + BaSO4
Al2(SO4)3 + 3Ba(OH)2 --> 2Al(OH)3 + 3BaSO4 Double Displacement
300
Mg(OH)2 + HCl --> MgCl2 + H2O
Mg(OH)2 + 2HCl --> MgCl2 + 2H2O Double Displacement
400
What must happen for a chemical reaction to occur?
the reactants must come in contact.
400
What does (aq) mean?
The substance is in an aqueous solution (it is dissolved in water)
400
K + H3PO4 --> K3PO4 + H2
6K + 2H3PO4 --> 2K3PO4 + 3H2
400
C3H8 + O2 --> CO2 + H2O
C3H8 + 5O2 --> 3CO2 + 4H2O Combustion
400
H2O + F3 --> Fe2O3 + H2
3H2O + 2F3 --> Fe2O3 + 3H2 Single replacement
500
When sulfur is heated until it melts and then is allowed to cool, beautiful yellow crystals form. Is this a physical or chemical change? How do you know?
Physical; change of state does not change the substance or its properties
500
What are the five types of reactions?
Synthesis, Decomposition, Combustion, Single Replacement, Double Replacement
500
FeS2 + O2 --> Fe2O3 + SO2
4FeS2 + 11O2 --> 2Fe2O3 + 8SO2
500
Na2CO3 + Fe(NO3)3 --> Fe2(CO3)3 + NaNO3
3Na2CO3 + 2Fe(NO3)3 --> Fe2(CO3)3 + 6NaNO3 Double Displacement
500
(NH4)2S + Mn(NO3)2 --> NH4NO3 + MnS
(NH4)2S + Mn(NO3)2 --> 2NH4NO3 + MnS Double Replacement