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Writing Chemical Equations
Balancing Equations
Just Memorize
Writing Equations
Types of Equations Lab Potpourri
$200 $200 $200 $200 $200 $200
$400 $400 $400 $400 $400 $400
$600 $600 $600 $600 $600 $600
$800 $800 $800 $800 $800 $800
$1000 $1000 $1000 $1000 $1000 $1000
Final Jeopardy
Final Jeopardy Combustion
Final Jeopardy2C4H10 + 13 O2 -----> 8CO2 + 10 H2O
Write the complete balanced equation for the combustion
of C4H10.
$200The number you put in front of a compound
to balance an equation.
A coefficient
$400To balance a compound so charges = zero
andit equals the numbers of atoms in a
compound
Purpose of a subscript
$600
False
True or False:
The coefficients on one side of the arrow will equal the
coefficients on the other side.
$800
When you have an odd number of oxygens on the right side and an even on the left side
of the arrow.
Under what circumstances is it easier to balance an
equation by making a ratio in front of the Oxygen atom
$1000
_MgO2 should be MgO
Why won’t this equation balance:
_MgCO3(s) --->_MgO2 (s)+_CO2(g)
$200
CH4
Formula for Methane
$400
Increases due to the adding of more energy levels
Trend of atomic size going down a family…
$600
Trend of atomic size going across a period
What Decreases due to energy level staying the same, while effective
nuclear charge increases (more pull on valence electrons)?
$800
What is the energy needed to move an electron?
Ionization Energy
$1000
The effective nuclear charge and atom size
What are factors which affect ionization energy and how they affect it ?
$200
Trend of ionization energy going down a family
What decreases (easier to remove) because size is
bigger, so valence electrons are further away ?
$400
Trend of ionization energy going across a period
What increases (harder to remove) due to effective nuclear charge
increasing (more pull - more likely to attract electrons) ?
$600
Electronegativity
What energy is needed to add an electron (likeliness to
gain)?
$800
effective nuclear charge and atom size
What factors which affect electronegativity and how
they affect it ?
$1000
Decreases.. if size is bigger, less pull from nucleus
•What is the trend of electronegativity going down
a family
$200
Combustion
What type of reaction is usually inventoried for balancing with CHO
$400
Ionic Size
Size of an ion
$600
to organize elements in meaningful way
Why was periodic table developed?
$800
Mendeleev - increasing molar mass, while today’s is increasing atomic number
How was Medeleevs scheme for listing elements different from that used in the modern
periodic table?
$1000
elements in same group have same number of valence electrons
What relationship can be seen between an elements
placement within a group and its electron configuration?
$200
Noble gases had not been discovered yet due to their inactivity
Why did Group 8 not appear on the Mendeleev periodic
table?
$400
increasing tendency to form neg ions therefore use less energy (minus -:
Exothermic
Trend of electron affinity across left to right
$600farther from nucleus therefore uses less
energy to add an electron also shielding can add electrons
Trend of electron affinity down top to bottom
$800
X + e− → X−
Equation electron affinity
$1000
M(g) + hn ® M+ + e-.
Equation for ionization energy
$200
both negative ions (right side) give off energy to gain an electron + ions use
energyElectron affinity energy can
be what: + or -?
$400
1) shielding 2) Effective (Strong) nuclear charge 3) add another orbit of electrons
increases distance from nucleus
Name 3 concepts that can affect periodicity
$600Protons and neutrons in element 114
What exactly do these two pictures represent and where
are the from?
$800
Dalton, Thompson, Rutherford and Bohr…Schrödinger, and Heisenberg,
Name the 1st five scientists in “The Atom Song”
$1000
1s2 2s2 2p6 3s2 3p2 and [Ne] 3s2 3p2
Long and short electron configuration for silicon.
Daily Double
You could not replace any other metal
When we talked about the “REACTIVITY SERIES” If
you were a metal at the bottom of the list, what would
this mean?
The Jeopardy champion!
