Which of the following is not an allotropic form of carbon?
(a) Ethylene
(b) Diamond
(c) Buckyball
(d) Graphene
(a) Ethylene
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The stars stay in "fixed" positions on the celestial sphere because they
A) are all located at precisely the same distance from Earth. B) are so far away that our eyes don't notice their motions through space. C) remain stationary relative to our solar system in space. D) were given their names by ancient civilizations.
A 1-kg block of iron weighs about
A) 1 N. B) 5 N. C) 10 N. D) more than 10 N.
If a rock contains both quartz and pyroxene (a silicate mineral), which melts first as the rock is heated?
What will be an ideal response?
If a virtual image is formed along the principal axis 12 cm from a concave mirror with the focal length 23 cm, what is the object distance from the mirror?
a. 11.0 cm b. 25 cm c. 13 cm d. 7.9 cm e. 4.0 cm