If two atoms have equal electronegativity, a bond formed between them is generally
a. ionic.
b. nonpolar.
c. very weak.
d. polar.
b
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Which of the following statements is true of the nuclear reactions in the Sun?
A) They take place only near the center. B) They take place only near the surface. C) They are entirely endothermic reactions. D) They occur at temperatures less than 100,000 K.
The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc
a. True b. False Indicate whether the statement is true or false
The sketch above shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence while (c) and (d) represent only small parts of the main sequence
Which group represents stars that are extremely bright and emit most of their radiation as ultraviolet light? A) a B) b C) c D) d E) e
A plutonium nuclear fuel rod shown in Figure 2-71 has energy generation in the amount of 3000 Btu/s?ft^3. For the grid model shown, write the node equations and solve for the temperatures. Assume ? = 10 W/m?K.
