Heteroatoms make a difference in the physical and chemical properties of an organic molecule because
A) they add extra mass to the hydrocarbon structure.
B) each heteroatom has its own characteristic chemistry.
C) they can enhance the polarity of the organic molecule.
D) all of the above
Answer: D
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The distance of Mars from the Sun is about 1.5 AU. How far is this in kilometers? (You do not need a calculator to answer this question. You do need to know what an AU is, within a factor of 1000.)
A) 1.5 150,000,000 km B) 1.5 150,000 km C) 150,000,000,000 / 1.5 km D) 150,000,000 / 1.5 km E) 1.5 150,000,000,000 km
Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the rotational inertia of this rigid body about an axis that passes through the mid-points of the longer sides and is parallel to the shorter sides?
a. 2.7 kg/m2 b. 3.6 kg/m2 c. 3.1 kg/m2 d. 4.1 kg/m2 e. 1.6 kg/m2
Ten lbm of carbon dioxide gas are cooled from 150ºF to 80ºF. The specific heat at
Earth's mantle is
a. metallic. b. very dense gas. c. solid. d. liquid.