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WHAT ARE PERIODIC TRENDS?
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WHAT HAPPENS TO ATOMIC RADII?
Does a negative ion (anion) get larger or smaller? Does a positive ion (cation) get larger or smaller?
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WHAT IS IONIZATION ENERGY?
The energy required to remove an electron Which element has the highest ionization energy? Why?
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WHAT IS ELECTRONEGATIVITY?
The ability of an atom to pull off an electron. Which element has the highest electronegativity?
Why?
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WHAT HAPPENS TO REACTIVITY?
What happens to reactivity in the Alkali Metals?
What happens to reactivity in the Halogens?
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How do we balance equations? Law of Conservation of Mass: No matter can be
created or destroyed. Begin by counting all the atoms on each side of the
yield sign (→) Now it’s trial and error but there are some guidelines
that help you get started: Begin by balancing the elements that are combined and
that appear only once on each side of the equation. Balance polyatomic ions as single units Balance H atoms and O atoms after all other elements
have been balanced Try not to change large compounds
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LET’S BALANCE THIS EQUATION!
CO2 + H2O → C6H12O6 + O2
How many atoms on each side? Which element do you begin with? Remember you cannot change subscript,
only add coefficients! 6CO2 + 6H2O → C6H12O6 + 6O2
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How Will Chemicals React?
H2 + O2 → H2O REACTANTS → PRODUCTS
EXOTHERMIC REACTIONS: Heat is a product (feels hot!)
ENDOTHERMIC REACTION: Heat is a reactant (feels cold!)
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Which type of reaction is this?
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WHAT ARE THE TYPES OF REACTIONS?
SYNTHESIS
DECOMPOSITION
SINGLE DISPLACEMENT
DOUBLE DISPLACEMENT
COMBUSTION
A + X → AX
AX → A + X
A + BX → B + AX
AX + BY→ AY + BX
A + O2 → CO2 + H2O
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WHAT IS AN ACTIVITY SERIES?
An activity series is a list of elements organized according to their reactivity
The most active element is placed on top and can replace any other element below it