The Helix and Egg nebulae which originated from (what are today) white dwarf stars are
a. supernova remnants.
b. planetary nebulae.
c. the result of uranium detonation.
d. the result of the collapse of the iron core of each star.
e. nebulae associated with protostars.
b
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Which of the following statements best describes the idea behind the Labeled Release Experiment on board the Viking landers?
A) living organisms in the soil should give off gases when they metabolize nutrients B) soil with living organisms in it should contain organic molecules C) living organisms in the soil should incorporate carbon from atmospheric gases D) radioactive gases should be produced when radioactive nutrients are added to a soil sample
The four fundamental forces that operate in the universe today are
A) strong force, weak force, electromagnetic force, gravity. B) strong force, weak force, electric force, magnetic force. C) nuclear force, electromagnetic force, gravity, tidal force. D) nuclear force, gravity, electric force, magnetic force.
A quantity of monatomic ideal gas expands adiabatically from a volume of 2.5 liters to 6.3 liters. If the initial pressure is P0, what is the final pressure?
a. 2.5P0 b. 4.7P0 c. 5.0P0 d. 0.21P0 e. 0.43P0
The definitions of an acid and a base as substances that give H+ and OH- ions, respectively, in water were proposed by the chemist named ______________
Fill in the blank(s) with correct word