Why is gasification being pursued as an option for coal use?
What will be an ideal response?
Gasification of coal allows pollutants to be cleaned more easily—before the gas is
burned, not afterward. This translates into cheaper pollution control, increased acceptability
to the public, both things that are desirable.
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Earth's axis is tilted 23.5 degrees from a perpendicular to the plane of the ecliptic
Indicate whether the statement is true or false.
The first pulsar was discovered by __________ in November of 1967
a. Jocelyn Bell b. Isaac Newton c. Albert Einstein d. Walter Baade e. Edwin Hubble
The radioactive isotope 226Ra (atomic number 88 ) decays to the isotope 222Rn (atomic number 86). What type of radioactive decay is this?
A) beta decay B) electron ionization C) electron capture D) alpha decay
A scuba diver has his lungs filled to half capacity (3 liters) when 10 m below the surface. If the diver holds his breath while quietly rising to the surface, what will the volume of the lungs be (in liters) at the surface? Assume the temperature is the same at all depths. (The density of water is 1.0 × 10^3 kg/m3.)
a. 5.9 b. 4.5 c. 6.4 d. 3.9 e. 3.1