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Chapter 2 The Chemistry of Life Section 1 – Nature of Matter.

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2 Chapter 2 The Chemistry of Life Section 1 – Nature of Matter

3 Atoms What is matter made of? 1. Atoms &Definition – Basic Unit of matter In normal terms – smallest pieces of any material

4 2. Elements &Definition – Substance consisting of 1 type of atom In Normal terms – pure substances (many atoms of the same type) Oxygen,, Copper, anything on the periodic table

5 3. Isotopes Definition – An Element that has a number of neutrons different from other atoms. In Normal terms – An atom with too many neutrons. (Makes it radioactive)

6 Chemical Bonding What holds all of this matter together? 3 Types of Chemical Bonds

7 1. Ionic Bonds Definition- when electrons are transferred from one atom to another. What is that like? An unequal relationship, where one person takes something from another, but does not give anything back.

8 How Strong are they? Not very strong. They are weak enough that they dissolve in water (i.e., salt) See the example of how salt forms on the next page.

9 Chlorine takes an electron from Sodium That creates a weak bond that forms salt. Sodium Chlorine

10 2. Covalent Bond Definition- Where two atoms share electrons What is that like? A mutual relationship where both people give and take.

11 How Strong are they? Very Strong. Does not dissolve in water (i.e., sugar) – Most of your body is made of covalent bonds … you know this because you do not melt. (living things are made of covalent bonds)

12 Examples of Covent bonds

13 2. Covalent Bond Definition- Where two atoms share electrons What is that like? A mutual relationship where both people give and take.

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