Elucidation of the structure of the periodic table The number of electron shells an atom determines the atomic period. Each skin has a subshell, which is loaded according to the following sequence, along with increasing atomic number: 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 8s 5g 6f 7d 7P 8p
Jumat, 21 Oktober 2011
1)Is O2 a reactant? (combustion)
2) One product? (synthesis)
3) One reactant? (decomposition)
4) Is an element being replaced? (single)
5) 2 switches? (double)
answer:
1)One or more reactants combine with oxygen releasing heat or light
Any combustion reaction must include the reactant oxygen, O2
2)Synthesis
In a synthesis reaction, two or more simple substances combine to form a more complex substance. Two or more reactants yielding one product is another way to identify a synthesis reaction. For example, simple hydrogen gas combined with simple oxygen gas can produce a more complex substance, such as water.
3)Decomposition
A decomposition reaction is the opposite of a synthesis reaction, where a more complex substance breaks down into its more simple parts.
A decomposition reaction can be considered to be the reverse of a combination reaction. In a decomposition reaction, one substance (the reactant) decomposes to form two or more products. For example, calcium carbonate (limestone) decomposes at high temperatures to calcium oxide (lime) and carbon dioxide. This reaction is used industrially to produce large quantities of lime.
4)In a single replacement reaction, a single uncombined element replaces another a compound
5)Double replacement
In a double replacement reaction, parts of two compounds switch places to form two new compounds.This is when the anions and cations of two different molecules switch places, forming two entirely different compounds. These reactions are in the general form:
AB + CD ---> AD + CB
One example of a double displacement reaction is the reaction of lead (II) nitrate with potassium iodide to form lead (II) iodide and potassium nitrate:
Pb(NO3)2 + 2 KI ---> PbI2 + 2 KNO3
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answer: 1)One or more reactants combine with oxygen releasing heat or light Any combustion reaction must include the reactant oxygen, O2
BalasHapus2)Synthesis In a synthesis reaction, two or more simple substances combine to form a more complex substance. Two or more reactants yielding one product is another way to identify a synthesis reaction. For example, simple hydrogen gas combined with simple oxygen gas can produce a more complex substance, such as water.
3)Decomposition A decomposition reaction is the opposite of a synthesis reaction, where a more complex substance breaks down into its more simple parts. A decomposition reaction can be considered to be the reverse of a combination reaction. In a decomposition reaction, one substance (the reactant) decomposes to form two or more products. For example, calcium carbonate (limestone) decomposes at high temperatures to calcium oxide (lime) and carbon dioxide. This reaction is used industrially to produce large quantities of lime.
4)In a single replacement reaction, a single uncombined element replaces another a compound
5)Double replacement In a double replacement reaction, parts of two compounds switch places to form two new compounds.This is when the anions and cations of two different molecules switch places, forming two entirely different compounds. These reactions are in the general form: AB + CD ---> AD + CB One example of a double displacement reaction is the reaction of lead (II) nitrate with potassium iodide to form lead (II) iodide and potassium nitrate: Pb(NO3)2 + 2 KI ---> PbI2 + 2 KNO3