Hydrocarbons with the general formula CnH2n+2 are called ______________
Fill in the blank(s) with correct word
alkanes
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The vibrations of a longitudinal wave move
A) along the direction of wave travel. B) at right angles to the direction of wave travel. C) that changes with speed.
Which statement about Io is true?
A) It is the only moon in the solar system with a thick atmosphere. B) It is thought to have a deep, subsurface ocean of liquid water. C) It is the most volcanically active body in our solar system. D) It is the largest moon in the solar system.
How is the age of the galaxy determined?
a. measuring the metallicity of Population II stars b. finding the turnoff point in the H-R diagram of globular clusters c. from the motion of stars in the galactic halo d. counting the number of open clusters in the spiral arms
An isolated black hole in space would be difficult to detect because
a. there would be no light source nearby.
b. it would not be rotating rapidly.
c. it would be stationary.
d. very little matter would be falling into it.
e. there would be very few stars behind it whose light the black hole could block out.