[Chemistry Class Notes] on Chemical Change Pdf for Exam

An Introduction

One material can be transformed into another with differing qualities as a result of a chemical transformation. One or newer substances are likely to form in this environment. Synthesis or breakdown of two substances might lead to a new substance being formed as a result of this process. The oxidation reaction is one example of a chemical change that results in a chemical reaction. 

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Chemical reactions are normally irreversible, except in the case of reversible alterations in chemistry. Some instances of chemical alterations are the creation of dye in the colour and the chemical change in the colour of hair.  

Chemical Changes 

It is possible for a chemical alteration to be reversed, or it is not. Let’s take a closer look at them.   

Reversible Change 

The term “reversible change” refers to a chemical alteration that can be undone. One or more approaches can be used to undo this alteration. Only the physical qualities of the material, such as its size and shape, tend to change in a reversible alteration. In the vast majority of circumstances, new material is not created when a chemical reaction is reversible. The elongation of a spring or the folding of paper are two examples of reversible chemical changes. 

Irreversible Change 

An irreversible change is a change that cannot be reversed by any physical or chemical methods. Newer substances are formed when a substance undergoes a permanent change. 

Reversible and irreversible alterations both have their merits and disadvantages. The blacksmith, for example, can cast a piece of iron into a variety of shapes. Following the heating procedure, the iron piece is pounded to the appropriate shape. Metals expand when heated and compress when cooled, as we know. In light of this, it is clear why we see reduced spaces between rails on the railway lines. In the summer, the temperature rises, causing the metal tracks to expand. Consequently, these gaps in the train lines compensate for the increase in the area. 

Chemical Process:  

  [Hydrogen(H_{2})+Oxygen(O_{2}) rightarrow Water(H_{2}O)] 

 

A chemical process is depicted in this diagram. hydrogen gas (2 H-H) is combined with oxygen gas (O=O) to form two molecules of water in the reaction (2 H-O-H). In the diagram, look at the arrow. What message does it convey? There is a strong correlation between the direction of the reaction and the formation of water.