CHEMICAL BONDS AND WATER
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BONDS (atoms joining together) Miss Sofia Paz
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Transcript of CHEMICAL BONDS AND WATER
CHEMICAL BONDS(atoms joining
together)
Miss Sofia Paz
CHEMICAL BONDS
Process of SHARING or TRANSFERRING
electrons (attraction)
Ionic bond
Covalent Bond
CHEMICAL BONDS
Electronegativity values of two atom are different...Ionic bonds are formed, electrons are transferred
Electronegativity values of two atom are similar.. COVALENT1.Nonpolar Covalent bonds form when the electronegativity values are very similar.
2.Polar Covalent bonds form when the electronegativity values are a little further apart. Covalent bonds form between two non-metal atoms.
IONIC BOND
COVALENT BOND
Ionic bond
One atom transfers an electron to another atom
(Electronegativity values of two atom are different)
Atoms colide and Cl strips
Na’s outer electron
Cl has 8 electrons on
its outer levelNa has 8 on
its outer level
Electric balances have changed.
Two atoms share electrons (Electronegativity values of two atom are similar)
Covalent Bonds
Covalent Bonds
Covalent Bonds
Covalent Bonds
WATER
Polar Covalent Bond
Oxygen end of the molecule has a slight
negative charge
The end with the two hydrogen atoms is slightly positive.
Two or more atoms held together by
covalent bonds.
# and types of atoms in a molecule
# and types of atoms in a molecule
How atoms are linked by bonds
MOLECULES
Atoms and complexes connected by non-covalent bonds such as hydrogen bonds or ionic bonds are generally not considered single molecules
Chemical reactions
Rearrangement of molecules. Existing bonds break and new ones form, resulting in the formation
of new substances.
Release more energy
than they absorb
Absorb more energy than they
release.
EXOTHERMIC REACTION
Endothermic reaction
Chemical reactions do not create or destroy
atoms, but only rearrange them. These
rearrangements usually involve
breaking chemical bonds in reactants and forming new
bonds in products.
Exothermic reaction
Endothermic reaction
sunlight + 6CO2(g) + H2O(l) = C6H12O6(aq) + 6O2(g)
Release more energy than they absorb
Absorb more energy than they release
Chemical reactions
The structure of Water
The end with the two hydrogen atoms is slightly positive.
Oxygen end of the molecule has a slight negative charge
POLAR MOLECULE!!
The electromagnetic attractive interaction between polar molecules, in which hydrogen (H) is bound to a highly electronegative atom, such as nitrogen (N), oxygen (O) or fluorine (F).
Hydrogen bond
is not a true bond but a strong dipole-dipole attraction, and should not be confused with a covalent bond
Q:How can water molecules be compared to magnets?
A:Both water molecules and magnets have opposite poles that cause them to be attracted to each other in a specific orientation.
Hydrogen
bonds
Life-Supporting Properties of WATER
WATER
H2O
Cohesion &
Adhesion
Temperature Moderation
Dissolve Substances
Low density of
ice
Life-Supporting Properties of WATER
WATER
H2O
Cohesion &
Adhesion
Temperature Moderation
Dissolve Substances
Low density of
ice
• http://www.youtube.com/watch?v=WbadROu9umc
Life-Supporting Properties of WATER
Life-Supporting Properties of WATER
WATER
H2O
Cohesion & Adhesion
Life-Supporting Properties of WATER
WATER
H2O
Temperature Moderation
Life-Supporting Properties of WATER
WATER
H2O
Dissolve Substance
s
Life-Supporting Properties of WATER
WATER
H2O
Low density of ice
