chemical bonds
TRANSCRIPT
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 colideand 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
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
