Strong & Weak Acids
28 Sep 09
What is the difference between strong acids and weak acids?
Strong acids dissociate 100%.
What does this mean?
It means that all hydrogen ions are released allowing it to react with any anions. Therefore, strong acids are very reactive.
eg. HCl, H2SO4, HNO3
Weak acids dissociate less than 50% which make weak acids much less reactive than strong acids.
eg. CH3COOH (vinegar), H2CO3 (carbonic acid in blood)
Strong acids dissociate 100%.
What does this mean?
It means that all hydrogen ions are released allowing it to react with any anions. Therefore, strong acids are very reactive.
eg. HCl, H2SO4, HNO3
Weak acids dissociate less than 50% which make weak acids much less reactive than strong acids.
eg. CH3COOH (vinegar), H2CO3 (carbonic acid in blood)
Ionic and Covalent Molecules
19 Sep 09
COVALENT MOLECULES
Covalent molecules contain bonds that share electrons. They can be even sharing of electrons, non polar molecules, or uneven sharing of molecules, polar molecules. Covalent molecules contain bonds between nonmetal and nonmetal.
For example: carbon dioxide, methane, sulfur dioxide.
IONIC MOLECULES
Ionic molecules contain bonds that do not share electrons. The electrons are transferred from a metal atom to a nonmetal atom forming ions, cation (positively charged atoms) and anion (negatively charged atoms). Therefore, ionic molecules are involved in complete transfer of electrons. Ionic molecules contain bonds between metal and non metal.
For example: Sodium chloride, Magnesium oxide, Lithium hydroxide.
Covalent molecules contain bonds that share electrons. They can be even sharing of electrons, non polar molecules, or uneven sharing of molecules, polar molecules. Covalent molecules contain bonds between nonmetal and nonmetal.
For example: carbon dioxide, methane, sulfur dioxide.
IONIC MOLECULES
Ionic molecules contain bonds that do not share electrons. The electrons are transferred from a metal atom to a nonmetal atom forming ions, cation (positively charged atoms) and anion (negatively charged atoms). Therefore, ionic molecules are involved in complete transfer of electrons. Ionic molecules contain bonds between metal and non metal.
For example: Sodium chloride, Magnesium oxide, Lithium hydroxide.