2009
2 August
Chemistry
Chemical Changes
Post FOUR

• Post One
  
  
  
  • Physical and Chemical Changes
    
  • Chemical Reactions
    
  
  
• Post Two
  
  
  
  • The Five Major Chemical Reaction, Synthesis
    
  • The Five Major Chemical Reaction, Decomposition
    
  • The Five Major Chemical Reaction, Combustion
    
  
  
• Post Three
  
  
  
  • The Five Major Chemical Reaction, Single Displacement
    
  • The Five Major Chemical Reaction, Double Displacement
    
  • Introduction to Chemical Bonding
    
  
  
• Post Four
  
  
  
  • Introduction to Elements
    
  • Ionic Bonding
    
  
  
• Post Five
  
  
  
  • Colavent Bonding
    
  • Conclusion
    
  
  
• Post Six
  
  
  
  • Fun and Interesting Facts
    
  
  

Hey guys! Made some changes to the skeleton, and I can confirm that this will be the final skeleton I'm following. I added in an Introduction to Elements, as I thought it would be important for you guys to understand more about elements before we continue on. Also, I removed Metallic Bonding, although my topic is on Chemical Changes, I did not want to dwell too much on bonding, hence, I removed part of it.

Without further ado, I shall begin.

Introduction to Elements

C6H12O6

This is the chemical symbol for glucose, or sugar in this case. As we can see, it is made up of C (carbon), H (hydrogen) and O (oxygen). Imagine if all these were separated, what would you get? You would get something that cannot be broken down into simpler substance by chemical reaction, and THAT, is an element. Hence, element is defined as a substance which cannot be broken down into simpler substances by chemical reactions. Hence, it is the building block of matter.

Another example would be water during electrolysis. It breaks down down into Hydrogen and Oxygen. Hence, Hydrogen and Oxygen are elements.

We use Chemical Symbols to represent some elements. Most of the elements come from the first letter, for example, Hydrogen's Chemical Symbol is H. Some comes from the first two letters of the Chemical. However, every letter that follows the first letter must be in small letter. For example Aluminium is written as Al. Sometimes, not the first two letters are used, Chlorine is written as Cl for example. Others come from other language like latin, example would be Tungsten, which is written as W.

Elements can be classified into two different types. Metals and non-metals, we will talk more about that later. Some examples of metals would be mercury, tin or aluminium. While non-metals would consist of chlorine, bromine, sulphur or iodine. Metals are normally shiny and have high density, they also have hgih melting and boiling points. It can conduct electricty and heat well, and is normally ductile and malleable.

There are many different uses of elements, for example, carbon can be compressed under high pressure to form diamonds. Nitrogen can be formed into liquid form to keep things cool. Mercury can be fit inside a thermometer to measure temperature. Or carbon can be made into graphite which is what we use in pencil lead.

With this, I will move on to ionic bonding.

Ionic Bonding

As I have said earlier, sodium metal combines with chlorine gas to form table salt. In this bonding, sodium loses one electron to the chlorine gas, and chlorine will complete its valence electrons and it will become 8 electrons.







And that is basically ionic bonding. Also note that after the bonding, the sodium turns into a negative-charged ion andd the chlorine gas turns into a positive-charged ions.

With that, I end this post. In the final post, I will talking more about Covalent Bonding.

References

Link One

Glossary

Electrolysis
Using electricity to drive a chemical reaction.

Ductile
Able to be easily bent.

Mallaeble
Can beaten into shapes.
Loonaeklips blogged on 5:24 AM
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