Flashcards in Module 2: Chemical Foundation of the Body Deck (38)
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1
Atom
smallest particle of an element showing properties of that element
2
Electron shell
where electrons are contained, Innermost shell has 2 electrons, each shell after that has up to 8 (trying to fill it)
More electrons an atom is missing = more reactive
3
Ions
Atoms that have either gained or lost an electron
# of electrons have changed, # of protons in nucleus has not changed
lose of e- = positive charge
gain of e- = negative charge
4
Ionic Bond
attraction of a positive ion to a negative one
Bond formed by transfer of electron to complete outer shell
5
Covalent Bond
bond formed by sharing electrons between two atoms
No electrons gained or lost so bond is strong and stable
6
Hydrogen Bond
Bond formed between a molecule with hydrogen and an "electron hungry" molecule
No transfer or sharing of electrons = weak bond
Responsible for 3D molecule shapes
7
Inorganic Compound
Does not contain carbon
Includes: Water, salts, many acids and bases
8
Water
60-80% of living cells
Molecules are attracted to each other (by Hydrogen)
Idea for supporting life
Ability to dissolve other chemicals
Participates in chemical reactions
Thermal stability
9
pH
based on number of hydrogen ions in solution
pH7 = base
Higher [H+] = lower pH
10
Acid
Molecules that release hydrogen in water
pH
11
Base
Molecules that accept hydrogen ions
pH>7
12
Organic Compounds
Contain Carbon
Covalent bonds
Include: carbs, lipids, proteins, nucleotides
13
Carbohydrates
Contain carbon, hydrogen, oxygen
Water soluble
14
Lipids
Contain carbon, hydrogen, oxygen BUT ratio or hydrogen to oxygen is high
Fats - not soluble in water
15
Proteins
Built of amino acids (carbon, hydrogen, oxygen, nitrogen)
Some are water soluble
Includes enzymes
16
Denaturation
protein exposed to extreme heat or pH
protein shape undergoes a change in conformation
17
Nucleotides
contain a carbon-nitrogen ring, a simple carb, and phosphate groups
Includes ATP
18
ATP
composed of :nitrogen-containing base "Adenine"
- simple sugar "ribose"
- 3 phosphate groups
ATP is immediately usable energy
19
Atomic number
number of protons in nucleus of an atom
20
Mass number
sum of protons and neutrons in nucleus
21
Free radical
An atom or group of atoms with an unpaired electron in outer shell
22
Valence shell
Outermost shell of electrons
23
Cation
positively charged
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Anion
Negatively charged
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Nonpolar covalent bond
two atoms share the electrons equally
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Polar covalent bond
Sharing of electrons between two atoms is unequal
One atom attracts the electrons more than the other
27
Law of conservation of energy
Energy cannot be created or destroyed
Only converted to another form
28
Exergonic Reactions
Ex=out
release more energy than they absorb
29
Endergonic Reactions
Absorb more energy than they release
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