2009
4 August
Chemistry
Chemical Changes
Post FIVE


Okay, this is the FINAL AND OFFICIAL POST!

• 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
    
  
  

I shall start with Covalent Bonding.

Covalent Bonding

Firstly, I will be showing you two self-drawn pictures.









In the first picture, we can see that the hydrogen atoms only have one electron, and the valence electron value for hydrogen is 2. However, we see two hydrogen, and each of them are trying to attract the other hydrogen's electron. However, if one does attract it, one hydrogen would have no electron (impossible), hence, they share a covalent bond, and inside that covalent bond, there are 2 shared electrons, 1 for each hydrogen, hence, each hydrogen would have 2 electrons.

Sometimes, there are multiple bonds.









Instead of sharing a bond to complete the valence electron of 6, there share multiple bonds.

The diagrams I have used above is called the Lewis Dot Structure.

Conclusion

Here, I have come to the end of my BioChem Journal, here is the reflection for the Chemistry Journal.


During the course of my research, I believe that everything that I have come across is interesting. During the course of the research, I have learnt a lot of new things, and many things surprise me. Also, not only did the information that I have gained surprised me a lot, I have also learnt a lot of new stuff. All of these information surprises me as before I carried on with this research, I did not know that things work that way.

Of course, after the research, there are still many things left unanswered. The world is so big and there are so many scientific knowledge. Some queries would be examples of chemical reaction, for example, mixing chlorine and sodium, what causes the spark and how do people produce table salt in mass quantities. Also, I would also be interested to find out how chemical reactions can help the world evolve, or how has it already helped the world to evolve at the current stage it is now.

This time, the difficulties faced are much greater than the ones faced when doing the Biology Blog, this is so as during the course of the research, the common mastery reviews are also nearing by, and national day parade is also coming, hence, there is less time for us to do our research and in turn, do our blog posts. Hence, we have to learn to manage our time wisely, also, the topics given were hard as we have not started learning them yet, so we had to pre-learn some things before it was taught in class, if not, there would not be enough time.

My personal response would be that I was really shocked and I learnt a lot of things about Chemical Changes, Chemical Reactions and of course, bonding. I have also learnt applications of Chemical Reactions, and elements, most importantly, like how carbon is compressed under high pressure to make diamond, how copper is bent to make wires, how graphite is used as the lead of our pencil cases, how silver is malleable and ductile and bent to made jewelery which we wear today, etc.

And yes, it has influence me, I have started to look at the world in a different perspective. Sometimes, I wonder how is everything made, how is our computer made, and I have become more curious. I also want to find out more about this topic, and hope that my research continues. Also, this has also urged me, if I have the chance next time, to go explore factories and observe the different processes in the factories, what type of chemical reactions they use, what elements do they mix in order to form everyday materials that we find. Also, after the course of this research, it has urged me to regularly check the periodic table for any new elements discovered, and keep up to date with any changes in the atomic number, or the positioning of the elements. Lastly, I hope that I can still continue posting on my BioChem Journal Blog.


There will still be 2 more posts, Fun and Interesting Facts on both the Nutrient Cycle and Chemical Changes, so do check back often. Also, I hope to continue the blog, and I will be posting about interesting scientific stuff I have seen in my life. So, bye!

References

Link One

Glossary

Electrons
Positively-charged atoms
Loonaeklips blogged on 6:20 AM
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