Wednesday, September 5, 2012

Chapter 2: Basic Chemistry (Part 1)

Chapter 2 in the Human Anatomy & Physiology is all about chemistry! This isn’t always everybody’s favorite topic so I am going to break down the chapter into 2 blogs because it has A LOT of information! Hopefully this post helps break down the basics of chemistry and is helpful for studying!

First, let’s go over the definition of matter. The authors define matter as anything that has mass and occupies space. Matter can be found in 3 different states, solid, liquid, and gas. All matter is composed of elements, substances that can’t be broken down into simpler substances, and these elements have different chemical and physical properties. Atoms, which make up elements, are what give these elements their physical and chemical properties. It helps me to look at the periodic table when discussing elements because it has pretty much everything you need to know about them right on the table!


As you can see, the diagram shows you a few different parts. The element symbol is the abbreviation of the element name, which for this diagram is C.  The atomic number of carbon is 6. The atomic number of an element is the number of protons the element has in the nucleus. This is important for finding out how many electrons and neutrons there are in an element! Lastly, the atomic weight of the element is located usually on the under the element name. The atomic weight is the average mass of the element.

Now that we’ve gone over a little about the different parts of the periodic table, I want to discuss a little about the different types of chemical bonds. An Ionic bond is when atoms gain or lose electrons and comes charged, but the number of protons remains the same. A covalent bond is the sharing of 2 or more valence shell electrons; this allows each atom to fill its valence shell. Lastly, hydrogen bonds are an attractive bond or force between an electropositive hydrogen and another electronegative atom from another molecule. Remember about hydrogen bonds is that they are not a true bond!

I hope this basic overview of chemistry from the first part of chapter 2 is helpful! Check back next week for chapter 2: part 2!

Word Count: 371

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