Chapter 6 Elements 1.Elements: is a substance that can’t

be broken down into simpler chemical substances.

A. The 4 main elements found in living things: C,H,O,N

Chapter 6 Elements

1. Carbon: long carbon chains make up the backbone for Proteins, Lipids, Carbohydrates, and Nucleic Acids. *Any molecule that contains carbon is called an organic molecule.

Chapter 6 Elements

2 and 3. Oxygen and Hydrogen are also found in Proteins, Lipids, Carbohydrates, and Nucleic acids, as well as make up water.

4. Nitrogen is found in both Proteins and Nucleic Acids.

Chapter 6 2. Atom: the smallest particle of an

element that has the characteristics of that element.

Chapter 6ATOMS BOND TOGETHER TO FORM

COMPOUNDSCOMPOUND: A substance that is

composed of atoms of two or more different elements that are chemically combined. Ex. H20, water is made up of Hydrogen and Oxygen.

2 H+O= H2O

Writing Chemical Formulas: 2H2 +O2 2H2O Reactants ProductsA. The number in front of the atom or

molecule tells you how many of each you have.

B. The subscript number tells you how many of that kind of atom is in a certain molecule.

Types of Bonds:1. Covalent Bonds: When two atoms

share an electron to form a bond. Ex. H2OA. Molecule: a group of atoms held together by covalent bonds.

Types of Bonds:2. Ionic Bond: a bond where one

positively charged ion takes an electron from a negatively charged ion. Ex. Na+and Cl- form NaCl

Types of Bonds:3. Hydrogen Bond: a weak magnetic

bond between the opposite poles of two polar molecules: Ex. Water A. Water is Polar because electrons shared in covalent bonds of molecules are not always shared equally resulting in a polar molecule with a partial positive pole and a partial negative pole.

Types of Bonds:B. Polar Molecule: a molecule with an unequal distribution of charge. Ex. H2O.

As a result of this polarity:*Water can dissolve many ionic

compounds. Ex. Salt and Sugar**Water molecules attract other water

molecules, forming a Hydrogen Bond. This gives Water great stability.

***Hydrogen Bonds Also helps hold together many large molecules, such as proteins and DNA.

LIFE SUBSTANCETerms:Polymer: is a large molecule formed

when smaller molecules bond together. Ex. Polysaccharides

Carbohydrate: an organic compound made of C,H, and O with a 2:1 Hydrogen : Oxygen ratio. It is mostly used as a source of energy for the body. Ex. Mammals store food in the liver in the form of glycogen, a glucose polymer.

Lipids: organic compounds that have a large proportion of C-H bonds and less oxygen that carbohydrates. Cell use lipids for energy storage, insulation, and a protective coating.

Building Blocks:AlcoholFatty AcidsProtein: A large complex polymer

made of C, H, O and N. Uses: Proteins the Building Blocks of many structural components in organisms. Ex. Muscles.

Amino Acids: the Building blocks of protein. There are 20 in nature. Amino Acid + Amino Acid etc…= Protein

Peptide Bonds: The bonds between Amino Acids in a protein.

Enzyme: A protein that changes the rate of chemical reactions.

Writing Chemical Formulas: 2H2 +O2 ----2H2O Reactants ProductsThe number in front of the atom or molecule tells you how many of each you have.The subscript number tells you how many of that kind of atom is in a certain molecule.Acids and Bases:ph: is a measure of how acidic or basic a solution is. The scale ranges from 0-14. A pH

of 7 is neutralAcids: any substance that forms hydroxide ions (OH) in water has a pH above 7 with 14

being the most basic.

Nucleic Acids: a complex molecule that stores cellular information in the form of a code. Ex. DNA and RNA. They contain all of the instructions used to form all of an organism’s enzymes and structural proteins.

Nucleotides: The building blocks of Nucleic Acids.

ORGANIC MACROMOLECULESAtoms bond together to form Molecules and then Molecules bond together to form Polymers.

1. Polymer/Macromolecule: is a large molecule formed when smaller molecules bond together.

* The four macromolecules that make up living things are:

1. Carbohydrates2. Lipids3. Proteins4. Nucleic Acids

I. Carbohydrate: is an organic compound made of C,H, and O with a 2:1 Hydrogen : Oxygen ratio.

1. Molecular Building Blocks: Monosacharides (simple sugars) like glucose and fructose bond together to form Polysaccharides (complex carbohydrates and starches).

Monosaccharide (Monomer)

Disaccharides

DisaccharidesPolysaccharide (Polymer)

2. Function: It is mostly used as a source of energy for the body. Ex. Mammals store food in the liver in the form of glycogen, a glucose polymer.

3. Examples: Carbohydrates can be found in pasta, potatoes, cereal, anything made of grain or corn, and simple sugars.

II. Lipids: organic compounds that have a large proportion of C-H bonds and less oxygen than carbohydrates. 1. Molecular Building Blocks:

Glycerol (Alcohol)Fatty Acids

2. Function: Cell use lipids for energy storage, insulation, and a protective coating.

Lipid Structure

3. Examples: Lipids can be found in oils, butter and other dairy products, meat products, and nuts.

III. Protein: A large complex polymer made of C, H, O and N.

1. Molecular Building Blocks: Amino Acids are the Building blocks of protein. There are 20 in nature. Amino Acid + Amino Acid etc…= ProteinA. Peptide Bonds: The covalent bonds between Amino Acids in a protein.

2. Function: A. Proteins provide the structure for living things (Growth and Repair)B. Proteins called Enzymes speed up and controls all of the chemical reactions in living things. C. Enzymes can become denatured (damaged) and as a result, stop working when exposed to too high or too low temperatures and pH.

* Acids and Bases:ph: is a measure of how acidic or basic a

solution is. The scale ranges from 0-14. A pH of 7 is neutral

Base: any substance that forms hydroxide ions (OH-) in water and has a pH above 7 with 14 being the most basic.

Acid: any substance that forms hydrogen ions (H+) in water and has a ph below 7 with 0 being the most acidic.

Examples of pH and Temperature affecting Enzymes:

Temp: Human enzymes work best at a temperature around 98.6 degrees F.High fevers can denature enzymes, slow down chemical reactions, and as a result, even kill the individual.

pH: Pepsin a human stomach enzyme works best at a pH of 2 but don’t work in the Small Intestine with a pH of 8.

3. Examples: Proteins can be found in meat, beans, nuts, eggs etc…

IV. Nucleic Acids: a complex molecule that stores cellular information in the form of a code. Ex. DNA and RNA. 1. 1. Molecular Building Blocks: Nucleotides: The building blocks of Nucleic Acids.

2. Function: They store information in code and contain all of the instructions used to form all of an organism’s enzymes and structural proteins.

DNA RNA Protein Trait

Organic Macro Molecule/ Polymer

Molecular Building Blocks

Function in Living Things

How to Detect

Carbohydrate Monosacharides Energy Sugar: Brick-Red Precipitate in Benedict’s solution

Starch: Iodine (Blue-Black)

Lipid Glycerol and

Fatty Acids

Energy Storage Insulation Protection

Translucent Brown Paper Bag

Protein Amino Acids

Structure and Control Chemical Reactions

Biuret’s solution turns purple

Nucleic Acid Nucleotides DNA RNA Protein Trait

Organic Macro Molecule/ Polymer

Molecular Subunits/Monomer

Function in Living Things

Foods

1. A. B. D.

2.

A. B. D.

3.

A. B. D.

4. A. B. D.