Unlock document.
This document is partially blurred.
Unlock all pages and 1 million more documents.
Get Access
Why is the mileage a vehicle gets less when burning E85 than 100% gasoline?
A. It is not, they are the same.
B. It is not, E85 gives better mileage per gallon burned.
C. Ethanol has a lower heat of combustion.
D. Ethanol has a higher heat of combustion.
What is meant by the statement 'sat fat is bad"?
A. All unsaturated fats are good.
B. Ingesting saturated fats can increase the threat of heart disease.
C. Obese people eat only saturated fats.
D. Fat cells tend to accumulate in the lower part of the body.
What herb is reported to reduce memory loss?
A. chamomile
B. ginko biloba
C. lemon balm
D. St. John's wort
How many DNA bases in any one gene must be changed for a mutation to have a
serious effect?
A. one
B. two
C. five
D. at least 100
Given this diagram,
this semiconductor is
A. made of pure silicon.
B. carrying an extra electron.
C. missing an electron.
D. excited by a photon.
Which of the following would bedescribed as"fine particles"?
A. SOx
B. NOx
C. O3
D. 2.5 μm diameter soot
Which occurrences or processes are expected to reduce the level of atmospheric
carbon?
I. Decaying plant and animal remains
II. The growth of trees
III. Formation of carbonate rock in the ocean
IV. Animal respiration
A. I and II only
B. II and III only
C. III and IV only
D. I and IV only
The O-to-O-to-O bond angle in an ozone (O3) molecule is not exactly 120 because
A. ozone molecules are linear so the bond angle is 180.
B. ozone molecules are tetrahedral so the bond angle is approximately 109.
C. the nonbonding electron pair occupies greater space than the bonding pairs.
D. the electrons in the double bond occupy more space that the nonbonding electron
pair.
If acids are compounds that release protons (H+), how is it that SOx and NOx cause acid
rain?
A. They react with hydrogen gas in the atmosphere to produce acids.
B. There is not sufficient evidence to indicate that these compounds actually do cause
acid rain.
C. They react with water to form acids.
D. They react with ammonia to form acids.
Calculate the amount of energy that is saved by replacing a 75-watt incandescent light
bulb with an 18-watt fluorescent bulb during the 1500-hour life of the incandescent
bulb.One watt is the equivalent of one joule of energy used per second.
A. 308,000 kJ
B. 405,000 kJ
C. 97,200 kJ
D. 27 kJ
During the chemical reaction in an electrochemical cell,
A. a substance is oxidized and gains electrons.
B. electrons travel from the cathode to the anode.
C. oxidation takes place alone, without an accompanying reduction.
D. oxidation occurs at the anode.
Alternative energy sources are currently being researched in effort to replace our
dependence on fossil fuels. Which is not a current research effort in this regard?
A. obtaining alternative fuels from renewable sources such as garbage
B. reintroducing the use of tetraethyl lead to increase the octane rating of gasoline
C. converting coal into gaseous and liquid fuels similar to petroleum products
D. increasing the use of farm product biomass, such as corn, to produce ethanol.
Which is not an advantage of using a solid electrolyte in a fuel cell?
A. It is impermeable to liquids and gases and will keep the fuel and oxidizer separated.
B. It cannot "dry out" and will allow the fuel cell to operate at higher temperatures than
one that uses water as part of the proton transfer mechanism.
C. It may use various fuels other than hydrogen gas, the fuel of choice in systems using
water as part of the proton transfer mechanism.
D. It eliminates the need for an oxidant; only a fuel is required.
This is a structural formula for propylene.
Which of these does not represent a possible arrangement of monomers within
polypropylene?
A.
B.
C.
D.
If the thymine (T) content of DNA is 29%, what is the content of guanine (G)?
A. 21%
B. 29%
C. 58%
D. 71%
Fission is the process of creating energy by
A. combining small nuclei to form a larger, more stable nucleus.
B. combining small nuclei to form a larger, less stable nucleus.
C. splitting large nuclei to form smaller, more stable nuclei.
D. splitting large nuclei to form smaller, less stable nuclei.
The quantity 0.0000064 g expressed in scientific notation is:
A. 6.4 106 g
B. 6.4 106 g
C. 6.4 107 g
D. 6.4 107 g
We cannot effectively clean nonpolar substances from our hands or clothing with water
alone; we must add soap or detergent. The structure of a typical soap molecule is shown
below. Which region of this molecule would dissolve in a nonpolar substance such as
grease?
A. Region 1
B. Region 2
C. Region 3
D. Region 4
Which nitrogen-containing substance is generally unreactive?
A. NO
B. NaNO2
C. N2
D. NH3
What is the purpose of the hot KOH solution in the fuel cell?
A. It is the product of the reaction between the hydrogen, the oxygen, and the
electrodes.
B. It keeps the electrodes conditioned and ready to work at high efficiency.
C. It is part of the acid-base reaction that generates the electricity in most fuel cells.
D. It maintains electroneutrality by working as an electrolyte; allowingtransfer ofions
between the half cells where the hydrogen and oxygen react.
Which raw material serves as the source for most polymers?
A. crude oil
B. natural gas
C. minerals
D. salts
The property of matter that determines the direction of heat flow is the
A. mass.
B. temperature.
C. volume.
D. density.
What metal is used to dope an n-type semiconductor?
A. arsenic
B. cadmium
C. gallium
D. silicon
Depleted uranium
A. is all U-235
B. is all U-238
C. is mostly, but not all U-238
D. is mostly, but not all U-235
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
Evaluate the ratio MH+ (pH 3) / MH+ (pH 7).
A. 0.0001
B. 0.001
C. 0.429
D. 10,000
Which radiation source is the biggest contributor to the average annual dose?
A. home building materials
B. food, air, and water
C. a nuclear power plant within 50 miles
D. fallout from nuclear weapons testing
How is heat energy used to generate electricity in a modern power plant?
A. Heat warms wires causing electrons to move through them more rapidly.
B. Heat boils water to make steam, which drives a turbine.
C. Heat warms the fins on a turbine, causing them to spin.
D. Heat generates strong magnetic fields through which the wires of a turbine move.
Which of the following is a weak base?
A. HCl
B. NaOH
C. NH3
D. LiOH
Consider these three compounds.
Which are isomers?
A. I and II only
B. II and III only
C. I and III only
D. I, II, and III
