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2.9
2.9
23
Biology
Undergraduate 1
01/31/2014

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Term
Molecules
Definition
Atoms combine to form...
Term
Chemical reaction
Definition
Formation of water from hydrogen and oxygen is an example of a...
Term
Molecules and compounds
Definition
Types of chemical bonds...
Term
Moleculw
Definition

Group of atoms bonded together 

Oxy, water, niro, glucos

Term
Compound
Definition

Molecule containing atoms of more thsn one element 

Water and glucose

Term
Ionic and Covalent
Definition
Two types of bonds
Term
ionic
Definition
Giving up or accepting
Term
Covalent
Definition
sharing electrons
Term
Ionic bonds
Definition
Form when 2 atoms are held together by the attraction between opposite charges
Term
1 electron
Definition
sodium has_____ in valence shell
Term
7 electrons
Definition
Chlorine has______ in valence shell
Term
Ions
Definition
Charged atoms
Term
Na+
Definition
sodium has 1 more proton than electrons now:
Term
Cl-
Definition
Chlorine has 1 more electron than protons now:
Term
salts
Definition
Ionic compunds often called salts
Term
Covalent bonds
Definition

2 atoms share electrons 

2 hydrogen atoms can share electrons to fill teir first shell

Structual formula lines H-H 

1 line indicates 1 pair of shared electrons 

Molecular formula-simply shows numbers of atoms involvd in H2

Term
Structure of water
Definition

Polar covalent bond

Atoms do not share electrons equally 

Oxygen is more electronegative than hydrogen 

Electrons spend more time around the oxygen nucleus than the hydrogen nuclei 

Oxygen end becomes slightly/hydrogens become slightly positive-not an ionic bond or ions

Term
Hydrogen bond
Definition
slightly positive hydrogen of one water molecule attracted to the slightly negative oxygen in another water molecule
Term

Solvency 

Cohesion and adhesion 

High heat capacity 

High heat vaporization 

Varying density

Definition
Properties of eater that support life:
Term
Dissolves many waters
Definition
due to polarity and H-bonding water...
Term
Hydrophilic
Definition
molecules attracted to water
Term
hydrophobic
Definition
molecules not attracted to water
Term
dissociate
Definition
water causes NaCI to ...
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