Alkyl halides are distinguished by the fact that at least one hydrogen atom in a hydrocarbon has been replaced by a(n)
a. alkyl group.
b. OH group.
c. halogen atom.
d. oxygen atom.
e. CH3 group.
c
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What happened to Venus's water?
A. A runaway greenhouse effect caused the water to be frozen in permanent ice caps. B. Venus still has all of its water, it has just become vapor in the atmosphere. C. Venus never had any water. D. Greenhouse warming caused its oceans to evaporate, and then its hydrogen was lost to space.
Electromagnetic radiation with a wavelength of 700 nm would be:
A) X-rays. B) red light. C) violet light. D) ultraviolet light. E) microwaves.
Consider an object in orbit around a star. The star suddenly shrinks in size, but does not change its mass. What happens to the object's orbit?
A) It is instantly ejected from its orbit. B) It remains in the same orbit. C) It settles into a smaller orbit, with similar distance from the surface as the original orbit. D) It gradually spirals into the star.
Astronaut Rachel leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. Rachel's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year)
According to Rachel, how long does the trip take? A) 14 years B) 15 years C) 11 years D) 4.2 years E) 23 years