set e Flashcards
The principal component of natural gas is
- Ethane
- Butane
- Propane
- Methane
- None of these choices
Methane
Which of the following base pairs is not possible?
- Adenine – Thymine
- Uracil – Adenine
- Cytosine – Guanine
- Guanine – Cytosine
- Thymine – Uracil
Thymine – Uracil
Which of the following solids is commonly used as an inactive electrode in electrochemical cells?
- Graphite
- Zinc
- Iron
- Copper
Graphite
The polymer used to make food and drink coolers and building insulation material is
- poly(vinyl acetate)
- polytetrafluoroethylene
- polystyrene
- polypropylene
- polyethylene
Polystyrene
Which element has the largest ionization energy?
- Bromine
- Chlorine
- Fluorine
- Iodine
Fluorine
The thermal behavior of any substance is characterized by what property?
- Thermal index
- Heat density
- Heat constant
- Thermal capacity
- Specific heat
Specific heat
Most of the isotopes with atomic number greater than 83 undergo which type of decay?
- Alpha emission
- Positron emission
- Electron emission
- Beta emission
- Gamma emission
Alpha emission
What is the stoichiometry of EDTA with metal ions?
- 1:1, because EDTA forms a cage-like structure around the metal ion
- 1:6, because EDTA is a hexaprotic weak acid with six distinct acid dissociation values
- 1:2, because EDTA has two binding sites upon loss of the two ammonium protons
- 1:4, because EDTA has four binding sites upon loss of the four carboxylic acid protons
1:1, because EDTA forms a cage-like structure around the metal ion
If polonium-210 emits an alpha particle, the other product will be
- Radon-206
- Mercury-204
- Lead-206
- Mercury-206
Lead-206
Which of the following accurately represents the molecular geometry for the carbon atoms in C2H6 (ethane), C2H4 (ethene), and C2H2 (ethyne)?
- tetrahedral, linear, and planar, respectively
- tetrahedral, planar, and linear, respectively
- linear, linear, and planar, respectively
- linear, tetrahedral, and planar, respectively
tetrahedral, planar, and linear, respectively
Which of the following compounds has been used as an octane enhancer?
- Tertiary-butyl alcohol (2-methyl-2-propanol)
- Ethanol
- Tetraethyllead
- Toluene (methylbenzene)
- All of these choices
All of these choices
Compounds used as reference standards for octane ratings of 100 and 0, respectively, are
- Gasoline and diesel fuel
- Isooctane and octane
- Octane and isooctane
- 2,2,4-trimethylpentane and heptane
- Isooctane and 2,2,4-trimethylpentane
2,2,4-trimethylpentane and heptane
In gas chromatography, volatile compounds in a mixture are separated by their
boiling points
A rate law relates which of the following?
- reaction rate and concentration
- temperature and concentration
- reaction rate and temperature
- energy and concentration
reaction rate and concentration
A polymer produced after converting compound (rubber) to an elastic and final end-use product is said to be
- elastomeric
- vulcanized
- copolymerized
- rubberized
vulcanized
The rating of the ability of a gasoline to burn smoothly in an internal combustion is its
- Octane ration
- Molar mass
- Fuel density
- Boiling point
- Energy value
Octane rating
Monomers used to produce addition polymers usually contain _____ in their molecular structure.
- two or more different functional groups
- benzene rings
- branched carbon chains
- double bonds
double bonds
This term refers to a quantity of heat transferred at constant pressure
- Work
- Specific heat capacity
- Thermal expansion coefficient
- Enthalpy
- Entropy
Enthalpy
The study of the relationships between electron flow and redox reactions is called
- Electrodynamics
- Nuclear chemistry
- Thermodynamics
- Electrochemistry
- Inorganic chemistry
Electrochemistry
In a buffer solution, if [A−] = [HA], which of the following must be true?
- pH < pKa
- pH > 7.00
- pH = pKa
- pH < 7.00
- pH > pKa
pH = pKa
Because water can act as a Bronsted-Lowry acid or base, it is said to be _____.
- amphiphilic
- amphoteric
- amphiprotic
- amphiphobic
- amphihydrous
amphiprotic
An aqueous solution of potassium benzoate is predicted to be
- strongly basic.
- weakly acidic.
- strongly acidic.
- weakly basic.
- neutral
weakly basic
As the pH of a solution rises, [H3O+] _____, pOH _____, and [OH−] _____.
- falls; rises; falls
- rises; falls; rises
- rises; falls; falls
- falls, falls, falls
- falls; falls; rises
falls; falls; rises
In Bronsted-Lowry acid-base theory, an acid is defined as a substance which _____ and a base as one which _____.
- donates a proton; accepts a proton
- generates H3O+ ions in aqueous solution; generates OH− ions in aqeous solution
- generates H3O+ ions in aqueous solution; donates a proton
- generates OH− in aqeous solution; generates H3O+ ion in aqueous solution
- accepts a proton; generates OH− ions in aqueous solution
donates a proton; accepts a proton
A Bronsted-Lowry acid is always
- a molecule or ion in which hydrogen is attached to an oxygen atom.
- a highly dissociated acid.
- a donor of one or more hydrogen ions.
- both an acceptor and donor of hydrogen ions.
- a weak acid.
a donor of one or more hydrogen ions.
A buffer solution is one which
- contains an equal number of hydronium and hydroxide ions.
- contains more than the expected amount of solute for a particular temperature and is therefore unstable.
- changes color upon addition of strong base.
- contains the maximum amount of solute possible for a particular temperature.
- resists changes in pH upon addition of acid or base.
resists changes in pH upon addition of acid or base.
