Question

Heat and electricity affect the decomposition reaction. Describe it with an example of each.

Answer 1

Answer:

Calculate the heat change which accompanies the combustion of ethanol when a certain mass of a substance is burnt in air to raise the temperature of 200g of water initially at 28oC to 42oC, given that the specific heat capacity of water is 4.2Jg-1K-1.

Solution:

Given parameters are

m = 200g

c = 4.2 Jg-1K-1

ΔT = 42 – 28

ΔT  = 14oC or 14 K

According to the question, a certain mass of ethanol is burnt to raise the temperature of water, which means heat absorbed by water is evolved from the combustion reaction of ethanol.

Heat lost in the combustion reaction is equal to heat gain by water.

Quantity of heat changed can be given by

Q = mcΔT

Q = 200 × 4.2 × 14

Therefore, Q = 11760 J

Answer 2

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is the process or effect of simplifying a single chemical entity (normal molecule, reaction intermediate, etc.) into two or more fragments.

Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis.

In short, the chemical reaction in which two or more products are formed from a single reactant is called a decomposition reaction.

The details of a decomposition process are not always well defined but some of the process is understood; much energy is needed to break bonds

Since all decomposition reactions break apart the bonds holding it together in order to produce into its simpler basic parts, the reactions would require some form of this energy in varying degrees.

Because of this fundamental rule, it is known that most of these reactions are endothermic although exceptions do exist.

The stability of a chemical compound is eventually limited when exposed to extreme environmental conditions such as heat, radiation, humidity, or the acidity of a solvent.

Because of this chemical decomposition is often an undesired chemical reaction. However chemical decomposition is being used in a growing number of ways.

For example

this method is employed for several analytical techniques, notably mass spectrometry, traditional gravimetric analysis, and thermogravimetric analysis.

Additionally decomposition reactions are used today for a number of other reasons in the production of a wide variety of products.

One of these is the explosive breakdown reaction of sodium azide [(NaN3)2] into nitrogen gas (N2) and sodium (Na). It is this process which powers the life-saving airbags present in virtually all of today's automobiles.

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