We are interested in decomposition reactions for two different reasons.
This is also a precipitation reaction in which a solid material forms from two substances dissolved in water; the solid formed is a precipitate. The removal of calcium from water as shown by this reaction is a common water treatment process called water softening.
It is done because excessive levels of calcium cause formation of scale that can clog water pipes and damage plumbing apparatus. Such a reaction is a neutralization reaction or simply an acid-base reaction. Classify each of the following reactions as combination, decomposition, substitution, metathesis, neutralization, precipitation, or evolution of a gas.
In some cases, a reaction will fit into more than one category. This name derives from the long standing use of oxidation to describe the reaction of a substance with oxygen.
Consider the following reaction of elemental calcium with elemental oxygen: Whenever something is oxidized, something else has to be reduced. In this case, elemental oxygen is reduced to produce the oxide ion, O 2- in CaO.
It is seen from this reaction that the calcium atoms lose electrons when they are oxidized and the oxygen atoms gain electrons. This leads to another definition of oxidation-reduction reactions, which is that when a chemical species loses electrons in a chemical reaction it is oxidized and when a species gains electrons it is reduced.
Elemental hydrogen is commonly involved in oxidation-reduction.
Whenever a chemical species reacts with elemental hydrogen, it is reduced. When elemental oxygen reacts to produce chemically combined oxygen, it is acting as an oxidizing agent and is reduced.
And when elemental hydrogen reacts to produce chemically combined hydrogen, it acts as a reducing agent and is oxidized. Consider what happens when the opposite reactions occur.
When chemically combined oxygen is released as elemental oxygen from a chemical reaction, the oxygen is oxidized. And when elemental hydrogen is released as the result of a chemical reaction, hydrogen is reduced.
A good illustration of these definitions may be seen when a direct electrical current is passed between two metal electrodes through water made electrically conducting by dissolving in it a salt, such as Na2SO4 as shown in Figure 4. At the left electrode, electrons are pumped into the system reducing the chemically bound H in H2O to elemental H2.
An electrode at which reduction occurs is called the cathode. At the other electrode, electrons are removed from the system, elemental O2 is released, and the oxygen in H2O is oxidized.
An electrode at which oxidation occurs is called the anode. The reaction shown above is an electrolysis reaction. It is very significant in the practice of green chemistry because it is a means of getting pure hydrogen and pure oxygen from water without the use of any other chemical reagents.
For example, using a nonpolluting source of energy, such as wind power, elemental hydrogen can be generated for use in nonpolluting fuel cells see Figure 2.Chemical reactions, or chemical changes, happen when the atoms in one or more chemicals split up and join together in new ways.
The general form is AX + BY AY + BX Metathesis is an alternate name for double replacement reactions. 32 Practice 2CO + O2 2CO2 2KClO3 2KCl + 3O2 Combination and combustion 2KClO3 2KCl + 3O2 Decomposition. Apr 21, · Best Answer: An example of spontaneous decomposition is that of hydrogen peroxide, which will slowly decompose into water and oxygen: 2 H2O2 → 2 H2O + 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 Status: Resolved. Mar 03, · Best Answer: Metathesis rxn refers to bimolecular, double replacement process that results in formation of gas, solid or liquid. Therefore a), c), and d) would qualify as metathesis caninariojana.com: Resolved.
\nNH4NO3(aq) + KCL(aq) --> KNO3(s) + NH4CL(aq)\n. \nThis is a type of metathesis reaction called a double displacement reaction. Aqueous ammonium nitrate and aqueous potassium chloride yields solid potassium nitrate and aqueous ammonium chloride. Gender essay on old spice guy role of media in society essay topic examples of good application essays for college critical thinking in human resource management many pages word essay double spaced.
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