Of the alcohols with the molecular formula C4H9OH, which has the lowest boiling point?
A) 1-butanol
B) sec-butyl alcohol
C) tert-butyl alcohol
D) isobutyl alcohol
C
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Because the health and environmental impacts of GMOs are not well-understood,
A) the United States allows GMOs to be used only in research. B) Europe severely limits GMO food imports. C) farmers in the United States refuse to use them. D) they are not widely used and were just another passing fad. E) Europe severely limits GMO food imports, and the United States allows GMOs to be used only in research.
Within the ‘levels of organization', the molecular level contains the smallest of all forms of matter
Indicate whether the statement is true or false
Which of the following features is characteristic of the winter solstice in the Northern Hemisphere?
A. Astronomical winter ends in the Northern Hemisphere. B. At middle latitudes in the Northern Hemisphere, it marks the longest night of the year. C. At high latitudes the days and nights are of equal length. D. The noon sun is overhead at latitude 23.5°N.
This scientist was the first to use the telescope in astronomy
A) Galileo B) Tycho Brahe C) Nicolaus Copernicus D) Sir Isaac Newton