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Transcript of Chemistry of Life Chapter #2 ST 110. OBJECTIVES Define Terms related to Chemical organization...
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Chemistry of Life
Chapter #2 ST 110
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OBJECTIVES Define Terms related to Chemical organization
Describe the structure of an atom
Compare and contrast ionic and covalent bonding
Distinguish between organic and inorganic compounds
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OBJECTIVES
Discuss chemical characteristics of water
Explain the concept of pH
Discuss the structure and function of organic molecules
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Life is ChemistryLife is Chemistry Food DigestionFood Digestion
Formation of bone tissueFormation of bone tissue
Contraction of musclesContraction of muscles
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BIOCHEMISTRY
Studying chemical aspects of life
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Levels of Chemical Organization Matter
Molecules
Atoms
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ATOMS
Composed of subatomic particles
Protons
Electrons
Neutrons
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Atoms
Nucleus Atomic number
Atomic mass
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Atoms Electrons stay in certain limits called orbitals
Each orbital can hold two electrons
The closer to the nucleus, the lower the energy level
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OrbitalsOrbitals The second energy level has four The second energy level has four
orbitalsorbitals
How many electrons can be held in How many electrons can be held in the second energy level?the second energy level?
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IMPORTANCE????The outer number of electrons
determines how the atom “behaves chemically”
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Elements
Element- pure substance of only one type of atom
Each element has a symbol
Example: Hydrogen Nitrogen Potassium
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C.O.H.N.Four atoms that make up 96%
of the human body
Carbon Oxygen
Hydrogen Nitrogen
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Molecules and CompoundsMolecules and Compounds Atoms unite with each other to form Atoms unite with each other to form
molecules. molecules.
Compounds have more than one Compounds have more than one element in them.element in them.
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Compounds
The number of atoms in each molecule is expressed by a subscript
Example: CO2 = carbon dioxide one carbon, two oxygen's H2O2 = hydrogen peroxide two hydrogen’s, two oxygen’s
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Compounds/Chemical BondingChemical bonds form to make atoms more stable
An atom is stable when it’s outer energy level is full
Atoms react to each other to make their outer most level full
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Ionic Bonds
Electrons are donated
One atom will become negatively charged, and the other will become positively charged.
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+++POSITIVE ION +++
• an ion that has given up its electron to another atom
---NEGATIVE ION---
• an ion that has borrowed an electron
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Na-sodium – donates one electron then becomes positive
IONIC BONDS
Cl-chlorine- borrows one electron then it becomes negativeNa + Cl = NaCl (sodium chloride)
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IONS
Ionic molecules dissolve easily in water
Dissociate- when ionic bonds break apart
Electrolytes- are molecules that form ions when
dissolved in water
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QUESTION???????
What are the four main atoms thatmake up 96% of the human body?
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QUESTION????????What is a positive ion?
What is a negative ion?
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Covalent Bonds Covalent Bonds
Atoms can fill their energy level by sharing electrons
Covalent bonds do not break apart in water
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Covalent Bonding
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Question???
What is ionic bonding?
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Question????
What is Covalent bonding?
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Inorganic Chemistry Inorganic compounds do not contain Carbon-Carbon , or Carbon Hydrogen bonds
Few inorganic compounds have carbon in them
Inorganic compounds are smaller and less complex than organic compounds
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H2OInorganic Compound
Why is water considered inorganic?
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Solvent is a substance in which other substances are dissolved.Water is a
Solvent !!!Solute is a substance that dissolves into another substance.
Is it a solvent, or a solute?
Salt is a solute!!!
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Mixture- a blend of two or morekinds of molecules
Aqueous solution - When water isthe solvent for two or more kindsof molecules
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Dehydration Synthesis Synthesis- Is the reaction in which two reactants combine to form a product
Dehydration synthesis can only occur when a water molecule is removed from the reactants and then they bind to form a larger product.
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HydrolysisHydrolysis Water disrupts the bonds in large Water disrupts the bonds in large
moleculesmolecules
The larger molecule is broken into The larger molecule is broken into smaller moleculessmaller molecules
Hydrolysis is the reverse of Hydrolysis is the reverse of dehydration synthesisdehydration synthesis
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Chemical Reactions AlwaysInvolve Energy Transfers
Some energy is stored as potential energy in the chemical bonds
Ex: ATP (adenosine triphosphate)
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pH Balanced !
Herbal Essence Shampoo? or something else?
pH balance is 7
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Which way does an ACIDgo on the pH scale????Which numbers on the pHscale represent a base?
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Acids are compounds that producean excess of H+ ions
Bases (alkaline) are compounds thatproduce an excess of OH- ions (or decreased in H+)
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Isotopes Isotopes- two atoms with the same
atomic number, but different atomic mass
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Metric SystemMetric System 1 meter= 39.37 inches1 meter= 39.37 inches
1 centimeter= 1/100 meter1 centimeter= 1/100 meter
1 millimeter= 1/1,000 meter1 millimeter= 1/1,000 meter
I micrometer= 1/1,000,000 meterI micrometer= 1/1,000,000 meter
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End of Day 1End of Day 1
Questions???Questions???
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Organic Chemistry
Much more complex than inorganic compounds
Larger than inorganic compounds
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Organic Chemistry
Four major types of organic compounds Carbohydrates Lipids Proteins Nucleic Acids
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Carbohydrates
Carbo-carbon hydrate-water
Basic unit of a carbohydrate is called monosaccharide
EX: Glucose important monosaccharide Primary source of energy
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Carbohydrates
Disaccharide- a molecule made up of 2 saccharide units (double sugar)EX: Sucrose- table sugar Lactose- milk sugar• After eaten, the body digests them
to form monosaccharides to be used as cellular fuel
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Carbohydrates
Polysaccharides- many saccharides joined together
Each glycogen molecule is a chain of glucose molecules joined together
EX: glycogen and starch
Liver cells and muscles cells form glycogen.Excess glucose in blood is stored for later use.
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Carbohydrates
Carbohydrates have potential energy stored in their bonds
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Lipids Lipid- fat and oils
At room temperature
Fats- solid lipid
Oils- liquid lipid
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LipidsTriglycerides
• Bonds can be broken apart to yield energy• Store energy in cells for later use
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Lipids Phospholipids
The phosphorus containing unit in each molecule forms a head that attracts water
Two fatty acid tails repel water
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Cholesterol
Performs several important functions in the body
Combines with phospholipids in cell membrane to stabilize bi-layer structure
Body uses cholesterol to make steroid hormones. Estrogen, testosterone, cortisone
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Proteins Very large molecule made of amino acids
Amino acids are held together by peptide bonds
Two types of proteinsStructural Functional
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Proteins
Form Structures of the body
Collagen- fibrous protein that holds many tissues together
Keratin- forms tough waterproof fibers in outer layer of the skin
Structural Proteins
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ProteinsFunctional Proteins
Participate in chemical processes
Hormones, cell membrane channels receptors, enzymes
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Enzymes
Catalysts- aid in chemical reactions
Lock-and-key model
Proteins can combine with other organic molecules to form glycoproteins lipoproteins
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Nucleic Acid
DNA-deoxyribonucleic acid• Master codeMaster code• Double helixDouble helix
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Nucleic AcidRNA- ribonucleic acid
Working copy
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Nucleic Acid
Made of nucleotide units
Sugar (ribose, or deoxyribose)
Phosphate- nitrogen based adenine, thymine or uracil, guanine cytosine
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What are the four major types of What are the four major types of organic compounds found in the organic compounds found in the
body?body?
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What is glycogen?What is glycogen?
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What is the primary source of What is the primary source of energy for cells?energy for cells?
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What are lipids?What are lipids?
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What are proteins made of?What are proteins made of?
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What is an enzyme?What is an enzyme?
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What are the two types of What are the two types of nucleic acids?nucleic acids?
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What are the nitrogen bases?What are the nitrogen bases?
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What shape is DNA?What shape is DNA?
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End of Day 2End of Day 2
Questions???Questions???