2. WHAT IS A BOND? A chemical bond is a bond between two or
more atoms caused by sharing or transfering electrons to reach
chemical stability. Ingrid
3. WHAT ARE MOLECULES? A molecule is a combination of two or
more atoms. sara
4. WHAT IS A SUBSTANCE? A substance is matter which has
specific composition and properties. There are two kind of
substances: Pure and Not pure substances. ingrid
5. PURE SUBSTANCES Pure substances are elements and compounds
which are already formed, and can not be changed. * Elements C
(Carbon) * Compounds H2 O (Water) N (Nitrogen) CH4 (Methane) O
(Oxygen) C2H6 (Ethane) sara
6. NOT PURE SUBSTANCES Not pure substances are classified as
Homogeneous and Heterogeneous. Homogeneous: Heterogeneous: Gatorade
Pozole Coffe Salad Soda Chapala lake ingrid
7. WHAT IS A COMPOUND? A compound is a substance formed when
two or more elements are bonded. sara
8. COVALENT BONDS A covalent bond is between two non-metals. In
a covalent bond, the electrons are shared. ingrid
9. IONS When an atom gets a charge, either by gaining or
loosing electrons. If it looses electrons it will become a positive
ion and if it gains it will become a negative ion. sara
10. IONIC BONDS The ionic bonds are bonds made by a metal and a
nonmetal. In ionic bonds there are gain and loss of electrons, they
do not share electrons. The metal will always lose and the nonmetal
will always gain. ingrid
11. POLYATOMIC IONS Polyatomic ions are bonds between two or
more atoms with a charge. Sara
12. POLYATOMIC IONS Some examples of Polyatomic ions are:
Ingrid
13. PROTONS Protons are the positive charge of an atom. Protons
are in the nucleous. If the atom has more protons than electrons it
becomes a positive ion. Sara
14. ELECTRONS Electrons are negative charge and they are in the
orbits. If the atom has more electrons than protons, it becomes a
negative ion. Ingrid
15. VALENCE ELECTRONS Valance Electrons are the electrons in
the outershell in a atom. They determine the elements behavior.
They can share or exchange. The valence electrons are the only ones
that can make a reaction happen. Sara
16. VALENCE ELECTRONS Metals usually loose their valence
electrons and nonmetals usually gain valence electrons in ionic
bonds. Ingrid
17. PERIODIC TABLE The periodic table is divided into families
which have a similar chemical properties. Alkali metals Alkaline
Earth metals Transitional metals Hologens Noble gases Sara
18. Ingrid
19. PERIODIC TABLE The periodic table is organized with its
atomic number, and the Electron structure. * Atomic number: Number
of protons in an atom. Sara
20. PERIODIC TABLE The periodic table is divided into groups
and Periods. Periods = Rows Groups = Columns (Number of its valence
electrons) Ingrid