ionic bonding

Ionic Bonding

Today I learned about ionic bonding. Ionic bonding is when two elements are used to form new elements. Ions are an atom or molecule, that is the electric charge of certain compounds or elements. The goal for the electrons is to achieve an equal number of valence like the Noble Gases.

In an element there are two electrons in the first shell, and 8 electrons in the second shell until the final shell.

For example the electric charge of Oxygen:
Oxygen has a valence (last shell) of 6 electrons. So, to make the number of electrons equal like the Noble Gases, it's easier to gain electrons. So, 8-6=2. The charge of oxygen is -2.

Now, there are also other examples of element with positive charges, like sodium.
Sodium's atomic number= 11electrons
Sodium has a valence of= 3 electrons

Since sodium only has a valence of 3 electrons in the outer shell, it's easier to lose electrons, since th goal for the electrons is to achieve an equal number of electrons like the noble gases.
So, sodium has a charge of +3.

Reflection about Moles

Moles are massive numbers, they are equal to 0.012 kg of carbon-12. Moles are the unit of a substance. There are formulas used in moles. Molar mass are also related to moles as they are also part of the formula. Molar mass has the same numercial value as the Ar or Mr.

The formulas are:

"Simple Balanced Equations" Reflection

L.O: Construct a word equation and simple balanced equations

I learned how to balance equations in chemistry. It's a bit difficult at first, since I keep on getting confused what number should I put to balance the equation, because when I put  like a certain number I might get it wrong, when I see the result as not balanced.

Example:

2   AgI   +  Na2S  ----> Ag2S + 2 NaI

Ba3N2   +  6H20 -----> 3 Ba(OH)2   + 2NH3

Well, in the end I learned a trick of how to do it quick though, I learned how to balance the equation and that is by looking at the numbers that I put in each element.

Molecular mass reflection

Today I reviewed about molecular mass. Molecular mass is the sum of atomic masses in elements, to predict the mass of the compound. To find the molecular mass, first I had to find the atomic mass of the element first and that is by looking at the periodic table.The unit used in molecular mass is grams/ mole.

Example:

Chemistry Reflection, Ar and Mr

Relative Atomic Mass (Ar):
It is the average mass of an atom in an element. For example: Na=23g/mol

Relative Molecular Mass (Mr):
It is the sum of masses of elements present in a compound. The relative molecular mass can be used to predict the mass of the product of certain elements.

Ex: CO2
C=12 x 1= 12
O=16 x 2= 32
 32+12=44 g/mol

SO4
S=32 x 1= 32
O=16 x 4=64
64+32=96 g/mol

H20
H= 1 x 2=2
O=16 x 1=16
16 +2= 18 g/mol

Reflection #3

L.O: Deducing the chemical formula of a compound from the relative number of atoms present.

I learned how to identify the number of atoms in a compound. I learned how to identify elements that is present in a compound.

Example:

Reflection about Naming Ionic Compounds

Ionic Compounds

I learned about naming ionic compounds ionic compounds are elements that are metal+nonmetal. Ionic compounds doesn't need any prefix, in naming ionic compounds I also learned the molecular formula of the ionic compounds, I learned that the elements have charge, and that the charge can be written in the result. I learned that the charges switch during the ionic compound.

For example:

Metal+ Nonmetal

Magnesium + Oxygen= Magnesium Oxide

Mg + O= MgO