The temperature at which a liquid freezes is
A) affected by foreign ions.
B) the same temperature at which its solid form melts.
C) both of these
D) neither of these
Answer: C
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The radius of a circle is increased by 5%. The percentage increase of the area is
A. 5%. B. 10%. C. 12%. D. 16%.
All the following statements are true. Which one follows directly from Kepler's third law?
A) Venus takes longer to rotate than it does to orbit the Sun. B) Venus has a thicker atmosphere than Mercury. C) Venus orbits the Sun at a slower average speed than Mercury. D) Venus is more massive than Mercury.
A hockey puck slides off the edge of a table with an initial velocity of 20.0 m/s. The height of the table above the ground is 2.0 m. What is the magnitude of the vertical component of the velocity of the puck just before it hits the ground?
A) 20.0 m/s B) 6.26 m/s C) 12.5 m/s D) 19.6 m/s E) 21 m/s
How is the number of unpaired valence electrons in an atom related to the number of bonds that the atom can form?
A) There is no defined relationship between the number of unpaired valence electrons and number of bonds that the atom can form. B) The number of unpaired valence electrons in an atom is one-half the number of bonds that the atom can form. C) The number of unpaired valence electrons in an atom is twice the number of bonds that the atom can form. D) The number of unpaired valence electrons in an atom is the same as the number of bonds that the atom can form.