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9045767
Science Trimester 3
Description
8th grade Science Mind Map on Science Trimester 3, created by Aemilia Blais on 22/05/2017.
No tags specified
science
periodic table
elements
atom
protons
neutrons
electrons
polyatomic ions
binary compounds
science
8th grade
Mind Map by
Aemilia Blais
, updated more than 1 year ago
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Created by
Aemilia Blais
over 7 years ago
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Resource summary
Science Trimester 3
Lecture 18
Who created the Periodic Table?
Dimitrii Mendeleev
The Periodic Table
3 Categories
Metals
Shiny, Malleable, Ductile, Good conductors of heat and electricity, Solid at room temperature, Most abundant
Metalloids
Most qualities of meats and non-metals, Electric charge, Good in computers and calculators
Nonmetals
Not shiny, Brittle, Not good conductors of heat or electricity, Solid or gas at room temperature, Do not reflect light
Combining Elements
First, you have to know the element's oxidation number
Find at the top of the chart, or use the sentence
Use the oxidation number to find out what it can combine with.
Ex. -1 will go nicely with +1
Sometimes it won't go in nicely, and then you have to use the LCM
Balancing Equations
4 Types of Equations
Synthesis
A+B= AB
Decomposition
AB=A+B
Single Replacement
AB+C=AC+B
Double Replacement
AB+CD= AC+BD
Chemical Bonds
Two Types
Ionic Bond
Oppositely charged atoms
Ion - atom with a charge
+ Cation +
- Anion -
Covalent Bond
Combine by sharing electrons
Sometimes is not equal
Polar Molecule - unequal sharing so has a charge on each end
Nonpolar - opposite of polar
Electronegativity
How strong an atom's attraction for an electron is
Calculate by looking at the electronegativity chart and then subtract the two elements
Then remember:
Greater or equal to 1.7
Ionic
Between 1.7 and .3
Polar Covalent
Less than .3
Non polar Covalent
Binary Formulas
Rules for Writing
Write the +element Write the - element Write subscripts Use the LCM for the subscripts
Rules for naming
Write the 1st element (+) full name Write the root of the second element Add the suffix -ide
Polyatomic Ions
Combinations of elements that act as one
Rules for combining with other elements
Should combine normally, just remember to think of it as a unit, rather than separate elements
When writing, put in parentheses and subscripts go on the outside
Rules for writing with other elements
Write the positive element first. (This will typically not be the poly) Then write the poly. Use the full name of each.
Typically negative ox. number
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