our group (Group 4)
Come out with this mindmap done on webspiration
http://mywebspiration.com/view/383865a6a7e
Friday, March 26, 2010
Answering queries for Lesson 1
Group 4's queries
2) What is the basic condition needed for decomposition?
The basic condition of decomposition is the presence of heat since energy in term of heat is required to overcome the activation barrier in order for the reaction to proceed.
1) Is this 5 type of chemical reaction generalise all chemical reaction in chemistry?
No, there is one more reaction type which is acid and base neutralisation reaction. But since this type of reaction is not often seem in chemistry cotext, thus is using neglected as one of the major chemical reaction.
2) What is the basic condition needed for decomposition?
The basic condition of decomposition is the presence of heat since energy in term of heat is required to overcome the activation barrier in order for the reaction to proceed.
1) Is this 5 type of chemical reaction generalise all chemical reaction in chemistry?
No, there is one more reaction type which is acid and base neutralisation reaction. But since this type of reaction is not often seem in chemistry cotext, thus is using neglected as one of the major chemical reaction.
DECOMPOSITION!!
Definition of decomposition : opposite of synthesis, is when a compound is broken down into simpler substances, usually through electrolysis.
An example of decomposition is as follows:
AB --> A + B
In a decomposition reaction a more complex substance breaks down into its more simple parts. One reactant yields 2 or more products. Basically, synthesis and decomposition reactions are opposites.
For example, water can be broken down into hydrogen gas and oxygen gas. The chemical equation for this decomposition reaction looks like:
reactant -------> product + product
To visualize a decomposition reaction look at the following cartoon:
In this cartoon the egg (the reactant), which contained the turtle at one time, now has opened and the turtle (product) and egg shell (product) are now two separate substances.
Some examples of decomposition reactions are shown below:
C12H22O11(s) ----> 12C(s) + 11H2O(g)
Pb(OH)2(cr) ----> PbO(cr) + H2O(g)
2Ag2O(cr) ----> 4Ag(cr) + O2(g)
An example of spontaneous decomposition is that of hydrogen peroxide, which will slowly decompose into water and oxygen.
2H2O2 → 2H2O + O2
Carbonates will decompose when heated, a notable exception being that of carbonic acid, H2CO3. Carbonic acid, the "fizz" in sodas, pop cans and other carbonated beverages, will decompose over time (spontaneously) into carbon dioxide and water
H2CO3 → H2O + CO2
Other carbonates will decompose when heated producing the corresponding metal oxide and carbon dioxide. In the following equation M represents a metal:
MCO3 → MO + CO2
An example of decomposition is as follows:
AB --> A + B
In a decomposition reaction a more complex substance breaks down into its more simple parts. One reactant yields 2 or more products. Basically, synthesis and decomposition reactions are opposites.
For example, water can be broken down into hydrogen gas and oxygen gas. The chemical equation for this decomposition reaction looks like:
reactant -------> product + product
To visualize a decomposition reaction look at the following cartoon:
In this cartoon the egg (the reactant), which contained the turtle at one time, now has opened and the turtle (product) and egg shell (product) are now two separate substances.
Some examples of decomposition reactions are shown below:
C12H22O11(s) ----> 12C(s) + 11H2O(g)
Pb(OH)2(cr) ----> PbO(cr) + H2O(g)
2Ag2O(cr) ----> 4Ag(cr) + O2(g)
An example of spontaneous decomposition is that of hydrogen peroxide, which will slowly decompose into water and oxygen.
2H2O2 → 2H2O + O2
Carbonates will decompose when heated, a notable exception being that of carbonic acid, H2CO3. Carbonic acid, the "fizz" in sodas, pop cans and other carbonated beverages, will decompose over time (spontaneously) into carbon dioxide and water
H2CO3 → H2O + CO2
Other carbonates will decompose when heated producing the corresponding metal oxide and carbon dioxide. In the following equation M represents a metal:
MCO3 → MO + CO2
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