In an isobaric process
a. the volume remains constant.
b. the temperature remains constant.
c. the pressure remains constant.
d. no heat is transferred between a system and its surroundings.
e. the internal energy is constant.
c
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Atomic Nucleus: The diameter of an atom is 1.4 × 10-10 m and the diameter of its nucleus is 1.0 × 10-14 m. What fraction of the atom's volume is occupied by its nucleus?
A. 3.6 × 10-13 B. 7.1 × 10-5 C. 5.1 × 10-9 D. 2.6 × 10-17
Regarding Ptolemy's and Copernicus's theories of astronomy, today we find that
A) both theories are useless because they disagree with the highly accurate measurements available today. B) Copernicus's theory is correct. C) Copernicus's theory is still useful, but more accurate theories are available today. D) both theories are false because we know that Kepler's theory is correct and precisely accurate. E) Ptolemy's theory is correct.
What can be said about drinking water that is 99.9999 percent free of some poison, such as a pesticide?
A) In each 10,000 parts of the contaminated water there is one part pesticide and 9999 parts pure water. B) In each 100,000 parts of the contaminated water there is one part pesticide and 99,999 parts pure water. C) The ratio of water molecules to pesticide molecules in the glass is so great that drinking the water is not problematic. D) The water is highly contaminated and surely not fit to drink.
A solution is defined to be a solute dissolved in a
solvent that is in a) the solid phase. b) the liquid phase. c) the gaseous phase. d) any of the three physical phases. •