CHEMISTRY BLOG #1

Why do atoms combine?

-Atoms combine to become stable
-To achieve the noble gas configuration

Remember:
*When an atom gives up, its charge becomes positive
*When an atom accepts, its charge becomes negative

Chemical Bond is the attracting force existing between any two atoms. There are many types of chemical bond but the two most basic types are Ionic and Covalent Bond. Ionic is the transfer of electrons from metal to non-metal while covalent bond is the sharing of electrons in two or more non-metals.

Properties of Covalent Compound:
-Covalent compounds have lower melting and boiling point than ionic compounds because they are easy to separate unlike the ionic compounds.
-Covalent compounds are soft and flexible because these molecules can move around each other easily beacuse there are no bonds between them.
-Covalent compounds are flammable than ionic.They contain hydrogen and oxygen atoms that can react to form carbon dioxide and water with oxygen gas so it is more flammable.
-Covalent compounds are poor conductor because we say that electricity is conducted in the water from the movements of the ion. There are no ions in the molecules so it cannot be a good conductor.

Properties of Ionic Compound:
-Ionic Compounds forms crystal because the ions tends to stack into forces between opposite ions but they are softer than ionic crystals
-They have higher melting and boiling point because it takes a lot of energy for the crystals to get pulled apart from each other.
-Ionic are hard and brittle because the positive and negative ion are strongly attached to each other, also because when you hit it, it feels hard cause of the crystals.
-Ionic compounds are good conductors if melted or in liquid form because when they are in liquid form the ions are free to conduct electricity, we say that electricity is conducted in water from movements of ions from one place to another so that's it but it isn't good if it is in solid form because of ionic bond.
Ex. Salt solid solution-poor conductor
      Salt liquid solution-good conductor

By the way, Lone pairs are unpaired atoms.
Example, H2O has 2 lone pairs
And also, Intramolecular force of attraction is the force of attraction that exist between bonds within a molecule.

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