Exam Flash Cards
From a Thermochemical standpoint, the formation of a chemical bond is:
Exothermic
The lattice energy of an ionic compound can be calculated using the:
Born-Haber Cycle
Atoms of different electronegativity form [ ] [ ] bonds
Polar Covalent
Defined as “the ability to attract electrons to itself in a chemical bond”
Electronegativity
Different, but formally correct Lewis structures of a molecule are called:
Resonance Structures
The acronym for the method of predicting molecular structure based on their Lewis structures is:
VSEPR
A central atom surrounded by 5 electron pairs always puts a lone pair in what position?
Equatorial
The mixing of orbitals in the Valence Bond Theory is called:
Hybridization
The full name of the SI unit for pressure, which is equal to 1 N/m2, is:
Pascal
22.4 L of a gas at standard temperature (273.15K) and pressure (atm) is called the:
Molar Volume
The pressure of a gas coexisting in equilibrium with a liquid is its:
Vapor Pressure
Urms is a measure of the [ ] [ ] of the particles of gas.
average velocity
The weakest of the intermolecular forces are:
Dispersion Forces
The type of intermolecular force giving water its unusually high boiling point is:
Hydrogen Bonding
The phase change directly from a solid to a gas is called:
Sublimation
Solid, liquid, and gas coexist in equilibrium at the:
Triple Point
The body centered cubic unit cell contains how many atoms?
two
Which forces are recognized as intermolecular forces?
- Dispersion Forces
- Dipole-dipole Forces
- Ion-dipole Forces
- Hydrogen Bonding
What is the coordination number of any atom in a body-centered cubic lattice?
8
LCAO is the acronym for a technique used in:
Valence Bond Theory
What is the formula of Ozone?
O3
The thermodynamic quantity that drives mixing of gases and solutions is the:
Entropy
A measure of solution concentration defined as nsolute/(nsolute + nsolvent) is called the:
Mole Fraction
Vapor pressure lowering and boiling point elevation are examples of:
Colligative Properties
The equation Psoln = Xsolvent • Posolvent is known as:
Raoult’s Law
The rate law d[A] / dt = k[A]2 belongs to a reaction [ ] [ ] in [A].
Second Order
The time required for a reactant to decrease to half of its original concentration is called a:
Half Life
The temperature dependence of reaction rates is governed by what equation?
Arrhenius Equation
A substance that facilitates a chemical reaction without being used up in the process is called a:
Catalyst
The notion that at equilibrium the rate of the forward reaction equals that of the reverse reaction is called:
Dynamic Equilibrium
The equation giving the concentrations of an equilibrium is the:
The Law of Mass Action
The tendency of equilibria to counteract imposed changes is:
Le Chatelier’s Principle
In the context of the Bronsted-Lowry definition, a base is a:
Proton Acceptor
The reaction 2H2O ⇔ H3O+ + OH- is called the [ ] of water.
Autoionization
The negative decadic logarithm of the hydroxide concentration is the:
pOH
The defining criterion of a ‘strong acid’ is that it is:
Completely Dissociated
Determining the concentration of a base with the aid of a buret is a lab technique called:
Titration
The numerical value of the ion product of water is:
1.0 x 10-14
A Lewis base is defined as an:
Electron Pair Donor
As T increases, the solubility of gases in liquids:
Goes through a minimum at Tcrit
Molality is a measure of concentration (of x) defined as:
nx / msolvent
The osmotic pressure π is given by:
π = MRT
A change in [ ] changes the rate constant of a reaction.
Temperature
What plot for a first-order reaction (A→B) gives a straight line?
ln[A] vs. t
The correct form of the Arrhenius equation is:
k = Ae(-Ea / kT)
A rule of thumb that close to room temperature an increase in T by 10oC:
Increases rate by a factor of 2-3
The half-life of a first-order reaction is:
t1/2 = 0.693 / k
The relationship between Kc and Kp is:
Kp = Kc(RT)Δn
An equimolar mixture of a weak base and its conjugate acid is a:
Buffer
The pH of a buffer is given by what equation?
Henderson-Hsselbalch
During the titration of a base of unknown concentration, an equal amounts of acid has been added at the:
Equivalence Point
The equilibrium constant governing solubility of salts is the:
Solubility Product
A process involving the ‘gain of electrons’ is a:
Reduction
A voltaic Cell consists of two [ ] [ ] connected by a wire and a salt bridge.
Half Cells
The electrode where the oxidation occurs is called the:
Anode
All standard reduction potentials are quoted in Volt versus the potential of the:
Standard Hydrogen Electrode
What constant gives the charge of a mole of electrons?
Faraday Constant
Cell potentials in non-standard state concentrations and pressures can be calculated with the:
Nernst Equation
The splitting of water by an electrical current is called the
[ ] of water.
Electrolysis
The electrochemical oxidation of water to O2 encounters a significant:
Overvoltage
Most elements are composed of several:
Isotopes
The inherent instability of heavy nuclei is the cause of:
Radioactivity
α-decay
Decay of a nuclide accompanied by ejection of a 42He particle.
The kinetics of radioactive decay are:
First Order
Nuclear Power Plants harvest the energy of nuclear [ ].
Fission
According to Einstein, the energy released in nuclear reactions is associated with a:
Mass Defect
At the equivalence point of a titration of a weak base with a strong acid, the solution is:
Mildly Acidic
The pH of a buffer made with equal amounts (# moles) of acetic acid and acetate is:
4.74
At a pH below 7.00, the indicator phenolphthalein is:
Colorless
The correct relationship between ΔGo and Eo is:
ΔGo = -nFEo
A common fuel cell extracts energy from what reaction:
2H2 + O2 → 2H2O
What is the heat of fission of 1 mole of 235U?
1.66 x 1010 kJ/mol
A process involving the ‘loss of electrons’ is an:
Oxidation
β-Decay
Decay of a nuclide accompanied by ejection of a 0-1e particle.
The MO Theory predicts that O2 has 2 unpaired electrons and thus is:
Paramagnetic
What is true for conjugate acid/base pairs?
pKa + pKb = 14
What is the halflife of 220Rn?
55.6 sec
What is the halflife of 235U?
703 million years
