Monday, November 14, 2011

Blog 3.2 Propreties of Ionic and Covalent Compounds.

  •  The General properties of Ionic Compounds. 
Hardness : Hard
Melting point : High
Conductivity: Ionic compound tend to conduct electricity because they transfer electrons.
Conductivity in H20 : Yes
  •  The General properties of Covalent substances.
Hardness: Soft
Melting point : Low
Conductivity: Covalent substances lack the ability to conduct electricity because they share electrons.
Conductivity in solution:No

The type of element that combine to form ionic compound are element non-metal and metal element and when they bond they transfer electrons. Non-metals tend to gain electrons and Metals tend to lose.

The type of element that combine to form  covalent bond are non-metals and non-metals and when they bond they shared electrons and those shared electron form a stable structure or compound.

Covalent compound tend to lack the ability to conduct electricity  as a solid or in a solution because covalent compound share electrons , therefore there's no positive charges , so no electricity can be conducted.

Ionic substances conduct electricity in solution but no as solids because they transfer electrons,and this cause them to have positive charges. However when Ionic substances are solid they cannot conduct electricity because they're not moving , so no electricity is being conducted.


Enrichment
Gatorade advertise that they contain electrolytes because In addition to water and sugar, Gatorade drink have electrolytes in the form of sodium and potassium. Electrolytes help maintain fluid balance throughout competition.In addition to keep fluid levels balanced, sodium,potassium and chloride ions create electrical impulses that enable cells to send message back and forth between themselves so you can see, think,move, and perform all the bio electrical  that you take for granted. The electrolyte substance used by the body is salt.

Friday, November 4, 2011

Lab 3.1 Modeling Of Molecules.

  1. The attraction between ions is stronger Al2O3 which is an ion melt  at 2072oC  Which is a higher melting point and they tend to be hard. Also Ions are electrically conductive and very aqueous ( conduct in liquid). Covalent bond are typically soft, have low melting point and aren't electrically conductive.
  2. The process of melting is a physical change so when HCL molecules are melted we will still have HCL because nothing new was formed and when physical change occur the original material can generally be recovered.
  3. Ionic compounds can conduct electricity because they transfer electrons , and this cause them to have positive charges. However when Ionic compounds are solid they cannot conduct electricity because they're not moving, so no electricity is being conducted.
  4. Molecular substances lack the ability to conduct electricity in either solid or liquid form because molecular substances share electrons, therefore there's no positive charges, so no electricity can be conducted.