A nonchemical combination of two or more substances in variable proportions is called
a. a mixture.
b. a compound.
c. an ion.
d. a molecule.
a
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The tallest volcano in the solar system is Mauna Kea, when measured from its base on the ocean floor to its highest point
Indicate whether the statement is true or false
The Hubble time is expressed as
A) H × D. B) D/v. C) 1/H. D) H × T. E) the critical density/H.
The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464?. Which of the following angles could NOT be the angle between the orbital angular momentum vector of the electron and an arbitrary z-direction?
A) 107° B) 90.0° C) 73.2° D) 54.7° E) 0.00°
An explorer walks into a lab in a science building. She has a compass in her hand and finds that the south pole of her compass points toward the room's East wall when she is nearer that wall and toward the west wall when she is nearer that wall. You could explain this if magnetized metal had been installed in the East and West walls with North poles pointing into the room. If no magnetic material
was installed in the North or South walls of the room, she would expect that a. the south pole of the compass would tend to point toward those walls. b. the north pole of the compass would tend to point toward those walls. c. the compass needle would not point in any particular direction. d. the north pole of the compass needle would tend to point toward the centers of those walls, but the south pole would tend to point toward the sides of those walls. e. the south pole of the compass needle would tend to point toward the centers of those walls, but the north pole would tend to point toward the sides of those walls.