Wednesday, February 08, 2012
   
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Chemistry

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Subject Index - Science


 

 

 

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1.  Chemistry is the study of matter and the changes that take place with that matter.   Everything in the Universe is made up of matter. Chemistry focuses on the properties of substances and the interactions between different types of matter, particularly reactions that involve electrons.
 
2.  Elements are the building blocks of matter. As of October 16, 2006, scientists know of 117 different elements. All of these elements are arranged in a Periodic Table.

3.  The periodic table arranges the chemical elements into a pattern so someone can predict the properties of elements based on where they are located on the table. Elements are arranged from left to right and from top to bottom in order of increasing atomic number or number of protons in the element.

4.  Many believe the word chemistry comes from the Egyptian word for “earth”.  The Ancient Egyptians, by 1000 BC, were using chemistry to make cosmetics, extract metal from ore, fermenting wine, and using plants to make medicine.

5.  Hydrogen is the first element on the periodic table. It has an atomic number of 1. It is highly flammable and is the most common element found in our universe.

6.  Cooking is chemistry.

7.  Chemistry is used in n many fields, but is mostly seen in the sciences and in medicine.

8.  Some chemists do field work. Some chemists teach a nd write. Some chemists work in a lab or in a research environment. Other chemists may work on computers, while others work for large company doing projects.

9.  A pharmacist can be considered a chemist.

10.  When one substances changes to form a new substance, it has gone through a chemical change. If a chemical changes but keeps the same characteristics it has gone through a physical change.
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