How many atoms are present in 0.375 mol of palladium (Pd) atoms?
A. 1.61 1024
B. 6.02 1023
C. 2.26 1023
D. 2.12 1021
Which compound is insoluble in water?
A. sodium carbonate
B. potassium nitrate
C. ammonium chloride
D. calcium carbonate
Among the alternative sources for generating electricity are
I. batteries.
II. fuel cells.
III. solar cells.
In populated but remote regions where it has proven too expensive or too difficult to
establish electrical networks, which is/are the most viable alternative method(s) of
providing electricity?
A. I only
B. I and II only
C. II and III only
D. I and III only
A 0.25 M solution of the sugar sucrose, C12H22O11, in water is tested for conductivity
using the type of apparatus shown. What do you predict will happen?
A. The bulb will not light up. Sucrose is an electrolyte, but not very soluble in aqueous
solution.
B. The bulb will not light up. Sucrose is in the molecular form in aqueous solution.
C. The light bulb will shine dimly. Sucrose is only partially ionized in aqueous solution.
D. The light bulb will shine brightly. Sucrose is highly ionized in aqueous solution.
Which of the following has the highest boiling point?
A. Propane
B. Octane
C. Methane
D. Butane
Most aquatic life in lakes cannot survive in water with a pH less than
A. 9.
B. 8.
C. 6.
D. 5.
Electrolysis is a process that
5-22-2013
A. produces an electrical current while decomposing water into hydrogen gas and
oxygen gas.
B. requires an electrical current to decompose water into hydrogen gas and oxygen gas.
C. produces heat energy while decomposing water into hydrogen gas and oxygen gas.
D. requires heat energy to decompose water into hydrogen gas and oxygen gas.
It is the _____ electrons that account for many of the chemical and physical properties
of elements.
A. innermost
B. intermediate
C. outermost
D. transitional
Which symbol(s) represent(s) elements in the noble gas family?
A. X and Z
B. P and L
C. Q
D. Y
When assessing the risk of an air pollutant, which does not play a role in considering
someone’s exposure to the pollutant?
A. a person’s lung capacity
B. a person’s breathing rate
C. the toxicity of the pollutant
D. the concentration in air of the pollutant
Dacron is classified as a polyester. Which linkage is correct? (The gray areas represent
the monomer backbones.)
A.
B.
C.
D.
What is the percentage composition of the average human body?
A. water 60%; fats 20%; carbohydrates and proteins 20%
B. water 50%; fats 10%; carbohydrates and proteins 20%
C. water 70%; fats 10%; carbohydrates and proteins 20%
D. water 50%; fats 20%; carbohydrates 20%; and proteins 10%
Which is/are concerns about genetically modified food crops
I. GM plants will spread into the wild
II. GM crops threaten the natural balance.
III. Use of genetically engineered crops will force pests to evolve
IV. GM crops may stop producing food because of damage to their genes.
A. I and II only
B. I and IV only
C. I, II, and III only
D. I, II, III, and IV
The energy equivalent of a certain cheeseburger is approximately 525 Cal. Since 1 Cal
is 4.184 kJ this corresponds to
A. 1.25 kJ.
B. 125 kJ.
C. 220 kJ.
D. 2200 kJ.
Determine the shape or geometry of PH3. (Hint: Use the Periodic Table to arrive at the
electron configuration for phosphorous.)
A. tetrahedral
B. trigonal pyramidal
C. bent
D. trigonal planar
Which of the following is not a consequence of biomagnification?
A. Consumption of tuna should be limited.
B. DDT from fish was killing large birds before the pesticide was banned.
C. Lead in water can lead to brain damage in children.
D. Polar compounds are found in high concentrations in predator animals.
The formation of nitric oxide (NO, a precursor to nitric acid) from oxygen and nitrogen
is ordinarily a very slow process. What accounts for its more rapid formation in
automobile exhaust?
A. the extreme conditions involved in gasoline combustion
B. the presence of nitrogen compounds in gasoline
C. catalysts present in fuel that facilitate its formation
D. well-designed catalytic converters
Halons differ from CFCs in that the atoms of ______ replace some ______ atoms.
A. iodine; chlorine
B. hydrogen; chlorine
C. bromine; chlorine
D. silicon; carbon
Approximately what percentage of the electrical energy generated in the United States
is produced from nuclear energy?
A. < 2%
B. 10%
C. 20%
D. 50%
What sort of energy is associated with energy from wind?
A. Potential energy
B. Thermal energy
C. Kinetic energy
D. Chemical energy
Any chemical or physical change that absorbs energy
A. has high activation energy.
B. is an endothermic process.
C. is an exothermic process.
D. is a catalyzed process.
Based on its name, which carbon compound contains the fewest carbon atoms?
A. ethanol
B. methane
C. chlorobutane
D. propyl alcohol
The lowest (or closest to the ground) layer of our atmosphere is the
A. troposphere.
B. ozone layer.
C. stratosphere.
D. mesosphere.
What type of radiation is given off in this nuclear reaction?
A. alpha
B. beta
C. gamma
D. neutron
Why have efforts to reduce sulfur oxide emissions met with greater success than those
directed at nitrogen oxide emissions reductions?
A. Sulfur oxides have higher molar masses than nitrogen oxides.
B. Sulfur oxide emissions come from a limited number of point sources.
C. Nitrogen oxides are only produced at power plants.
D. Nitrogen reacts more readily with oxygen than sulfur.
Which correctly pairs an indoor pollutant with its source?
A. formaldehyde and unvented space heaters
B. O3 and electrical arcing
C. radon and glues and solvents
D. nicotine and paint and paint thinners
This is a schematic representation of the two different forms of polyethylene.
Which of the following statements is true?
A. I is HDPE and it has a lower melting point than II which is LDPE.
B. I is HDPE and it has a higher melting point than II which is LDPE.
C. I is LDPE and it has a lower melting point than II which is HDPE.
D. I is LDPE and it has a higher melting point than II which is HDPE.
CFCs were originally developed to replace which refrigerant compound(s)?
A. ice
B. HCFCs
C. ammonia and sulfur dioxide
D. propane
Petroleum (crude oil) is a complex mixture of thousands of substances, the majority of
which are
A. carbohydrates.
B. hydrocarbons.
C. natural gases.
D. proteins.
Which of the following in NOT a step in fractional distillation of crude oil?
A. The crude oil is pumped into a large vessel and heated.
B. As the temperature increases, the compounds vaporize.
C. Fractions are mixed with natural gas to enrich the hydrocarbon content.
D. Once in the gas phase, compounds travel up the tall distillation or fractionation
tower. The compounds with smaller molar masses travel higher; the compounds with
larger molar masses travel shorter distances up the column
Which substance is not considered to be an air pollutant?
A. N2
B. SO2
C. NO2
D. O3
Which factor did not play a major role in the formation of fossil fuels from plant
matter?
A. high temperatures
B. high pressures
C. an absence of O2
D. an abundance of sunlight