WorksheetsChem 109 Ch. 1, 2, 3
Total questions: 178
Worksheet time: 15hrs 50mins
Are all non zero digits significant?
Yes
No
Are zeros between nonzero digits (regardless of if there is a decimal) significant?
Yes
No
Are zeros to the right of the decimal significant?
Yes
No
A decimal placed after one or more zeros indicates the zeros are significant
True
False
Are all digits in the coefficient of a number expressed in scientific notion significant?
Yes
No
In numbers less than zero, are the zeros between the decimal and the nonzero digit significant?
Yes
No
In numbers greater than zero, are the zeros following the last nonzero unit significant?
Yes
No
How do you record sig figs when doing addition or subtraction?
Use the least # of decimal points
Use the least number of sig figs
How do you record sig figs when doing multiplication or division?
Use the least # of decimal points
Use the least number of sig figs
What is the expression for the prefix giga (the base being meters)?
109
106
103
102
What is the expression for the prefix mega (the base being meters)?
109
106
103
102
What is the expression for the prefix kilo (the base being meters)?
109
106
103
102
What is the expression for the prefix hecto (the base being meters)?
109
106
103
102
What is the expression for the prefix deka (the base being meters)?
101
10−1
10−2
10−3
What is the expression for the prefix deci (the base being meters)?
101
10−1
10−2
10−3
What is the expression for the prefix deci (the base being meters)?
101
10−1
10−2
10−3
What is the expression for the prefix centi (the base being meters)?
101
10−1
10−2
10−3
What is the expression for the prefix milli (the base being meters)?
101
10−1
10−2
10−3
What is the expression for the prefix micro (the base being meters)?
10−6
10−9
What is the expression for the prefix nano (the base being meters)?
10−6
10−9
How do you know how many sig figs to include?
Report the digits you know and one digit of uncertainty
It has a uniform composition and distinct properties
A combination of 2 or more substances. Substances still have individual properties and can be separated by physical means.
Same composition without
What is a pure substance?
Report the digits you know and one digit of uncertainty
It has a uniform composition and distinct properties
A combination of 2 or more substances. Substances still have individual properties and can be separated by physical means.
What is a mixture?
Report the digits you know and one digit of uncertainty
It has a uniform composition and distinct properties
A combination of 2 or more substances. Substances still have individual properties and can be separated by physical means.
What is a homogeneous mixture?
Same composition throughout
Variable composition
Cannot be separated into smaller substances by chemical means (One type of atom)
2 or more elements chemically combined in fixed ratios (more than one type of atom)
What is a heterogeneous mixture?
Same composition throughout
Variable composition
Cannot be separated into smaller substances by chemical means (One type of atom)
2 or more elements chemically combined in fixed ratios (more than one type of atom)
What is an element (pure substance)?
Same composition throughout
Variable composition
Cannot be separated into smaller substances by chemical means (One type of atom)
2 or more elements chemically combined in fixed ratios (more than one type of atom)
What is a compound (pure substance)?
Same composition throughout
Variable composition
Cannot be separated into smaller substances by chemical means (One type of atom)
2 or more elements chemically combined in fixed ratios (more than one type of atom)
What are the characteristics of a solid?
Constant volume and shape. Particles vibrate in place
Constant volume with the shape of the bottom of the container. Random particle movement with the container.
Variable shape and volume that fills container. Random particle movement.
What are the characteristics of a liquid?
Constant volume and shape. Particles vibrate in place
Constant volume with the shape of the bottom of the container. Random particle movement with the container.
Variable shape and volume that fills container. Random particle movement.
What are the characteristics of a gas?
Constant volume and shape. Particles vibrate in place
Constant volume with the shape of the bottom of the container. Random particle movement with the container.
Variable shape and volume that fills container. Random particle movement.
What are the characteristics of kinetic energy?
Temperature is a measure of the average kinetic energy of particles of matter.
Heat is kinetic energy transferred from a sample of
matter at a higher temp to a sample of matter at a lower
temp
Stored, gravitational energy
Chemical--from the composition of matter
What are the characteristics of potential energy?
Temperature is a measure of the average kinetic energy of particles of matter.
Heat is kinetic energy transferred from a sample of
matter at a higher temp to a sample of matter at a lower
temp
Stored, gravitational energy
Chemical--from the composition of matter
What happens to a substance when we increase its temperature?
Temperature is related to the average kinetic energy of the
atoms and molecules of a material. So the higher the temperature, the more kinetic energy and movement.
can be measured WITHOUT changing the composition/ identity of the substance
can be measured only when a chemical change occurs
What are physical properties of matter?
Temperature is related to the average kinetic energy of the
atoms and molecules of a material. So the higher the temperature, the more kinetic energy and movement.
can be measured WITHOUT changing the composition/ identity of the substance
can be measured only when a chemical change occurs
What are chemical properties of matter?
Temperature is related to the average kinetic energy of the
atoms and molecules of a material. So the higher the temperature, the more kinetic energy and movement.
can be measured WITHOUT changing the composition/ identity of the substance
can be measured only when a chemical change occurs
What are examples of physical properties?
Color, melting point, boiling point, density, etc
Flammability, acidity, basicity, reactivity with various other chemicals
What are examples of chemical properties?
Color, melting point, boiling point, density, etc
Flammability, acidity, basicity, reactivity with various other chemicals
What is a chemical change?
Involves formation of one or more new substances that have different physical and chemical properties than original
chemical reactions
all possible chemical changes for a substance
A change in the physical properties of a substance without a change in chemical composition
What is a physical change?
Involves formation of one or more new substances that have different physical and chemical properties than original
chemical reactions
all possible chemical changes for a substance
A change in the physical properties of a substance without a change in chemical composition
Chemical changes=
Involves formation of one or more new substances that have different physical and chemical properties than original
chemical reactions
all possible chemical changes for a substance
A change in the physical properties of a substance without a change in chemical composition
Chemical properties=
Involves formation of one or more new substances that have different physical and chemical properties than original
chemical reactions
all possible chemical changes for a substance
A change in the physical properties of a substance without a change in chemical composition
What is an exothermic reaction? (think exo EXIT)
Gives off heat/energy ex: condensing or freezing
Takes in heat/energy ex: melting or boiling
What is an endothermic reaction?
Gives off heat/energy ex: condensing or freezing
Takes in heat/energy ex: melting or boiling
Electrons increase in rows, so as we go down the periodic table, the atomic radius...
Increases
Decreases
As we go across the periodic table, the atomic radius...
Increases
Decreases
What are atoms?
Subatomic particles that constitute the fundamental building blocks of ordinary matter
found in the nucleus with a positive charge
found in the nucleus with no charge
found outside the nucleus with a negative charge
What are protons?
Subatomic particles that constitute the fundamental building blocks of ordinary matter
found in the nucleus with a positive charge
found in the nucleus with no charge
found outside the nucleus with a negative charge
What are neutrons?
Subatomic particles that constitute the fundamental building blocks of ordinary matter
found in the nucleus with a positive charge
found in the nucleus with no charge
found outside the nucleus with a negative charge
What are electrons?
Subatomic particles that constitute the fundamental building blocks of ordinary matter
found in the nucleus with a positive charge
found in the nucleus with no charge
found outside the nucleus with a negative charge
What are the atomic mass units (AMU)?
Used to express the relative mass of atoms and subatomic particles
1 Dalton (Da) = the mass of 1 proton or the mass of 1 neutron (same-ish mass)
Charge
Mass
1 amu=
Used to express the relative mass of atoms and subatomic particles
1 Dalton (Da) = the mass of 1 proton or the mass of 1 neutron (same-ish mass)
Charge
Mass
What is only affected by protons and electrons?
Charge
Mass
What is only affected by the number of protons?
Charge
Mass
What are isotopes?
Atoms with the same # of protons but a different # of neutrons (Same element, different mass)
Atomic mass
Atomic number
What is A?
Atoms with the same # of protons but a different # of neutrons (Same element, different mass)
Atomic mass
Atomic number
What is Z?
Atoms with the same # of protons but a different # of neutrons (Same element, different mass)
Atomic mass
Atomic number
What is A or atomic mass?
total number of nucleons (protons + neutrons) in the nucleus
the number of protons in the nucleus; determines the identity of the element
What is Z or atomic number?
total number of nucleons (protons + neutrons) in the nucleus
the number of protons in the nucleus; determines the identity of the element
What is the average atomic mass based on?
Naturally occurring isotopes
Relative occurrence of each isotope
Who and what created the periodic table?
Mendeleev in 1869
When elements are arranged in order of increasing atomic number, certain sets of properties recur periodically
# of protons and # of electrons
How would you complete this isotope diagram?
1. Look at the periodic table to find the atomic number or number of protons
2. Put the # of protons in the nucleus and the same number as electrons in the "cloud space"
3. Take the atomic mass #-the # of protons to get the # of neutrons
What is periodic law?
Mendeleev in 1869
When elements are arranged in order of increasing atomic number, certain sets of properties recur periodically
# of protons and # of electrons
Chemical properties are determined primarily by
Mendeleev in 1869
When elements are arranged in order of increasing atomic number, certain sets of properties recur periodically
the # of protons and the # of electrons
What is the blue portion called?
Metals
Metalloids
Nonmetals
What is the green portion called?
Metals
Metalloids
Nonmetals
What is the yellow portion called?
Metals
Metalloids
Nonmetals
What are nucleons?
The # of protons + the # of neutrons or the atomic mass
in the nucleus
a release of subatomic particles and/or energy
unstable atoms
Where do nuclear changes occur?
The # of protons + the # of neutrons or the atomic mass
in the nucleus
a release of subatomic particles and/or energy
unstable atoms
What is radiation?
The # of protons + the # of neutrons or the atomic mass
in the nucleus
a release of subatomic particles and/or energy
unstable atoms
What makes isotopes undergo a nuclear change?
The # of protons + the # of neutrons or the atomic mass
in the nucleus
a release of subatomic particles and/or energy
unstable atoms
What are the characteristics of alpha particles?
Mirrors the nucleus of a helium-4 atom but is an alpha particle instead, so Alpha replaces where the He would be
The charge is 2+
The mass number is 4
Change of the reactant atom: proton number goes down by 2, mass number down by 4
What is an example of alpha decay?
What is an example of beta decay?
What is an example of positron decay?
What is an example of gamma radiation?
What are the characteristics of beta particles?
Identical to the charge and mass of an electron
The charge is -1
The mass number is 0
The reactant atom proton number goes up by 1
What are the characteristics of a positron?
Same mass as β particle, but opposite charge
The charge is +1
The mass number is 0
The reactant atom proton number goes down by 1
What are the characteristics of gamma rays?
The charge is 0
The mass number is 0
The reactant atom will not change
What is the 'octet rule'?
When at atom loses or gains electron to become an ion, they do so to get to an “octet” (8) of electrons in their outer most energy level
Noble gases
1872
What elements already fulfill the octet rule?
When at atom loses or gains electron to become an ion, they do so to get to an “octet” (8) of electrons in their outer most energy level
Noble gases
1872
When did Mendeleev organize the elements by atomic mass on the periodic table?
When at atom loses or gains electron to become an ion, they do so to get to an “octet” (8) of electrons in their outer most energy level
Noble gases
1872
How do periods move?
Top to bottom
Left to right
How do groups move?
Top to bottom
Left to right
What are metals?
Shiny solids; conduct heat and electricity; are malleable and ductile
Solids, liquids and gases; nonconductors; solids are brittle
metals; called f-block – separated due to f orbitals and similar reactivity
Shiny solids (like metals); brittle (like nonmetals); semiconductors
What are non metals?
Shiny solids; conduct heat and electricity; are malleable and ductile
Solids, liquids and gases; nonconductors; solids are brittle
metals; called f-block – separated due to f orbitals and similar reactivity
Shiny solids (like metals); brittle (like nonmetals); semiconductors
What are Lanthanides/Actinides?
Shiny solids; conduct heat and electricity; are malleable and ductile
Solids, liquids and gases; nonconductors; solids are brittle
metals; called f-block – separated due to f orbitals and similar reactivity
Shiny solids (like metals); brittle (like nonmetals); semiconductors
What are Metalloids?
Shiny solids; conduct heat and electricity; are malleable and ductile
Solids, liquids and gases; nonconductors; solids are brittle
metals; called f-block – separated due to f orbitals and similar reactivity
Shiny solids (like metals); brittle (like nonmetals); semiconductors
What determines an atoms reactivity?
The electrons
As a “cloud” but some electrons stay closer to the nucleus and some are farther
the “address” of the e-
the n level
How are electrons positioned around the nucleus?
The electrons
As a “cloud” but some electrons stay closer to the nucleus and some are farther
the “address” of the e-
the n level
What are orbitals?
The electrons
As a “cloud” but some electrons stay closer to the nucleus and some are farther
the “address” of the e-
the n level
?What helps you determine how far electrons are from the nucleus?
The electrons
As a “cloud” but some electrons stay closer to the nucleus and some are farther
the “address” of the e-
the n level
What is the n level?
Describes the energy level or “shell”
the distance from the nucleus
the periods (period 1 is n=1)
As n increases, what also increases?
Describes the energy level or “shell”
the distance from the nucleus
the periods (period 1 is n=1)
What do you use to determine the n level?
Describes the energy level or “shell”
the distance from the nucleus
the periods (period 1 is n=1)
How many electrons can each orbital have?
2
s
f
The inner shell electron screens the outer shell electron
What is the closest sublevel (s,p,d,f)?
2
s
f
The inner shell electron screens the outer shell electron
What is the farthest sublevel (s,p,d,f)?
2
s
f
The inner shell electron screens the outer shell electron
What is electron screening?
2
s
f
The inner shell electron screens the outer shell electron
How many orbitals does s have?
one (2 e- max)
three (6 e- max)
five (10 e- max)
seven (14 e- max)
How many orbitals does p have?
one (2 e- max)
three (6 e- max)
five (10 e- max)
seven (14 e- max)
How many orbitals does d have?
one (2 e- max)
three (6 e- max)
five (10 e- max)
seven (14 e- max)
How many orbitals does f have?
one (2 e- max)
three (6 e- max)
five (10 e- max)
seven (14 e- max)
What is the s orbital shape?
What is the p orbital shape?
What is the d orbital shape?
What is the f orbital shape?
What are the steps for determinings how energy fills the sublevels?
1. Write the max number of electrons after the letter orbital ( 1s2 )
2. Divide by the n level (11s2)
3. Continue for each n level that correlates to the period (22s2 or 43p6 4s2)
What are valence electrons?
electrons in highest energy level of an atom
repeating patterns found in the periodic table
physical and chemical properties
electron arrangements
What is periodicity?
electrons in highest energy level of an atom
repeating patterns found in the periodic table
physical and chemical properties
electron arrangements
What are examples of periodicity?
physical and chemical properties
electron arrangements
What do valence electrons correlate to?
Group number (as group number increase, they increase)
Lewis dot structures
Principal quantum number (n)
Effective nuclear charge (Z* or Zeff)
What diagram displays valence electrons?
Group number (as group number increase, they increase)
Lewis dot structures
Principal quantum number (n)
Effective nuclear charge (Z* or Zeff)
All periodic trends can be described by what two parameters?
Principal quantum number (n)
Effective nuclear charge (Z* or Zeff )
What is Van der Waal’s method to determining atomic radius?
How close can we get them without bonding? and take ½ distance between nuclei = r
They are bonded and take ½ distance between nuclei = r
What is the Covalent method to determining atomic radius?
How close can we get them without bonding? and take ½ distance between nuclei = r
They are bonded and take ½ distance between nuclei = r
As you go across a period, electrons are added to the same energy level. At the same time, protons are being added to the nucleus. The concentration of more protons in the nucleus creates a "higher effective nuclear charge." In other words, there is a stronger force of attraction pulling the electrons closer to the nucleus resulting in a smaller atomic radius.
True
False
The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase.
True
False
Chemical formulas show the composition of the chemical. What does composition include?
What is present (what atoms/ions)
How many atoms/ions of each are present
What is bonding?
when electrons from different atoms interact
to become more stable and like an octet or noble gas configuration
valence electrons
core electrons
Why do atoms bond?
when electrons from different atoms interact
to become more stable and like an octet or noble gas configuration
valence electrons
core electrons
What electrons bond?
when electrons from different atoms interact
to become more stable and like an octet or noble gas configuration
valence electrons
core electrons
What electrons do NOT bond?
when electrons from different atoms interact
to become more stable and like an octet or noble gas configuration
valence electrons
core electrons
What is an ion?
atom (or group of atoms) with a net positive/negative charge
ion with a positive charge
ion with a negative charge
What is a cation?
atom (or group of atoms) with a net positive/negative charge
ion with a positive charge
ion with a negative charge
What is an anion?
atom (or group of atoms) with a net positive/negative charge
ion with a positive charge
ion with a negative charge
If a neutral atom loses one or more electrons it becomes a
cation
anion
ionic
covalent
If a neutral atom gains one or more electrons it becomes a
cation
anion
ionic
covalent
What bonds share an electron?
cation
anion
ionic
covalent
What bonds take away an electron?
cation
anion
ionic
covalent
How do we predict the ion charge of a main group metal cations?
Charge of cation is equal in magnitude to Group #
Charge of anion is equal to (Group # - 8
How do we predict the ion charge of a nonmetal anion?
Charge of cation is equal in magnitude to Group #
Charge of anion is equal to (Group # - 8
What are ionic compounds? What are their characteristics?
compounds formed when cations and anions join together (held together by equal but opposite charges)
No discrete molecules
Occur in repeating formula units
Chemical formula represents ratio of cation to anion
Pure substances can be?
Elements or compounds
Atomic or molecular
Molecular or ionic
Elements can be?
Elements or compounds
Atomic or molecular
Molecular or ionic
Compounds can be?
Elements or compounds
Atomic or molecular
Molecular or ionic
Ionic compounds can predict chemical formula if we know ion charges (CaBr2 --> One calcium atom for every two bromine atoms)
True
False
How do you name ionic compounds?
Name cation 1st (usually metal) and then anion 2nd with ide
Name cation 1st (metal or NH4 1+) and then anion 2nd.... but Polyatomic keeps its name and the nonmetal gets -ide
can form more than one type of ion
Name cation 1st (metal) then the charge of the cation in () and using roman numerals. Then the base name of the anion with ide.
How do you name polyatomic compounds?
Name cation 1st (usually metal) and then anion 2nd with ide
Name cation 1st (metal or NH4 1+) and then anion 2nd.... but Polyatomic keeps its name and the nonmetal gets -ide
can form more than one type of ion
Name cation 1st (metal) then the charge of the cation in () and using roman numerals. Then the base name of the anion with ide.
What are transition metals?
Name cation 1st (usually metal) and then anion 2nd with ide
Name cation 1st (metal or NH4 1+) and then anion 2nd.... but Polyatomic keeps its name and the nonmetal gets -ide
can form more than one type of ion
Name cation 1st (metal) then the charge of the cation in () and using roman numerals. Then the base name of the anion with ide.
How do you name transition metals?
Name cation 1st (usually metal) and then anion 2nd with ide
Name cation 1st (metal or NH4 1+) and then anion 2nd.... but Polyatomic keeps its name and the nonmetal gets -ide
can form more than one type of ion
Name cation 1st (metal) then the charge of the cation in () and using roman numerals. Then the base name of the anion with ide.
What are molecular compounds (ex: F2)?
compounds held together by only covalent bonds
Name 1st element with the prefix and then the 2nd element with the prefix and end in ide
How do you name molecular compounds?
compounds held together by only covalent bonds
Name 1st element (furthest left or lowest) with the prefix and then the 2nd element with the prefix and end in ide
How do you write hydronium ion?
H3O+
OH−
CO3 2−
NO3−
How do you write hydroxide ion?
H3O+
OH−
CO3 2−
NO3−
How do you write carbonate ion?
H3O+
OH−
CO3 2−
NO3−
How do you write nitrate ion?
H3O+
OH−
CO3 2−
NO3−
How do you write sulfate ion?
SO4 2−
NH4+
PO43−
How do you write ammonium ion?
SO4 2−
NH4+
PO43−
How do you write phosphate ion?
SO4 2−
NH4+
PO43−
How do you calculate bonds needed for a lewis dot structure?
v e- needed-v e- present/2
Distribute remaining e- to surrounding atoms to give each an octet including lone pairs
Check, # Bonds, #e-, formal charge • If there are not enough e- to complete octets, remove a lone pair from one surrounding atom and try a double bond, then triple bond.
After calculating bonds for a lewis dot structure what is the next step?
v e- needed-v e- present/2
Distribute remaining e- to surrounding atoms to give each an octet including lone pairs
Check, # Bonds, #e-, formal charge • If there are not enough e- to complete octets, remove a lone pair from one surrounding atom and try a double bond, then triple bond.
After distributing remaining e- for a lewis dot structure what is the next step?
v e- needed-v e- present/2
Distribute remaining e- to surrounding atoms to give each an octet including lone pairs
Check, # Bonds, #e-, formal charge • If there are not enough e- to complete octets, remove a lone pair from one surrounding atom and try a double bond, then triple bond.
What is activation energy? EA
Amount of energy that must be attained by reactants for a chemical reaction to occur
Spark ignites methane (gas burner)
arrow from the reactants to the highest
the number of reactants that are converted to products in a given time
What is an example of activation energy? EA
Amount of energy that must be attained by reactants for a chemical reaction to occur
Spark ignites methane (gas burner)
arrow from the reactants to the highest
the number of reactants that are converted to products in a given time
How is activation energy drawn on the diagram?
Amount of energy that must be attained by reactants for a chemical reaction to occur
Spark ignites methane (gas burner)
arrow from the reactants to the highest
the number of reactants that are converted to products in a given time
What is the reaction rate?
Amount of energy that must be attained by reactants for a chemical reaction to occur
Spark ignites methane (gas burner)
arrow from the reactants to the highest
the number of reactants that are converted to products in a given time
What is an example of slow reaction rates?
Rust
Hydrogen explosion
slower
faster
What is an example of fast reaction rates?
Rust
Hydrogen explosion
slower
faster
The larger the hill, the ______ the rate
Rust
Hydrogen explosion
slower
faster
The smaller the hill, the ______ the rate
Rust
Hydrogen explosion
slower
faster
What factors affect activation energy?
Concentration
Temperature (heat)
Presence of a catalyst
The steeper the concentration, the ______ the reaction
faster
slower
True
False
The less steep the concentration, the ______ the reaction
faster
slower
True
False
More reactants = more collisions
True
False
How does heat affect the rate of the reaction?
Heat energy causes particles to move faster, thus have higher kinetic energy
Greater kinetic energy leads to more collisions with more energy.
For every 10 °C increase, a reaction rate roughly doubles.
Lower temperatures = slower reaction
How do catalysts affect the rate of the reaction?
They increase the rate of the reaction by decreasing the activation energy
Provide alternate pathway between reactants and products
Are indicated by name over the reaction arrow
How do you find catalysts on the diagram?
They increase the rate of the reaction by decreasing the activation energy
Provide alternate pathway between reactants and products
Are indicated by name over the reaction arrow
What do catalysts provide?
They increase the rate of the reaction by decreasing the activation energy
Provide alternate pathway between reactants and products
Are indicated by name over the reaction arrow
What are the characteristics of catalysts?
Do NOT affect heat of reaction, ΔHrxn.
Are NOT reactants, are not consumed by the reaction, but can be used over and over.
Often provide a surface for reactants to bind in proper orientation
What are enzymes? What are their characteristics? How do they affect the rate of the reaction?
Biological catalysts that are large 3-D biomolecules
Most are proteins composed of many C, H, N, O, and S plus some Zn or Mg.
Greatly increase reaction rates (105 to 1017 times)
What is the forward reaction?
converts reactants into products.
converts products into reactants
When the rate of forward reaction equals the rate of the reverse reaction
the concentrations of reactants and products are constant
What is a reverse reaction?
converts reactants into products.
converts products into reactants
When the rate of forward reaction equals the rate of the reverse reaction
the concentrations of reactants and products are constant
What is a chemical equilibrium?
converts reactants into products.
converts products into reactants
When the rate of forward reaction equals the rate of the reverse reaction
the concentrations of reactants and products are constant
How do you know if there is a chemical equilibrium?
converts reactants into products.
converts products into reactants
When the rate of forward reaction equals the rate of the reverse reaction
the concentrations of reactants and products are constant
What energy allows chemical equilibrium to occur?
the lowest energy for the reaction mixture
Reaction favors products
Reaction favors reactants
Size
product concentrations > reactant concentrations
which is favored?
the lowest energy for the reaction mixture
Reaction favors products
Reaction favors reactants
Size
product concentrations < reactant concentrations
which is favored?
the lowest energy for the reaction mixture
Reaction favors products
Reaction favors reactants
Size
What indicates whether e indicates whether reactants or products are favored at
equilibrium?
the lowest energy for the reaction mixture
Reaction favors products
Reaction favors reactants
Size
