In organic compounds, which of the following elements normally forms three covalent bonds?
A) carbon
B) hydrogen
C) nitrogen
D) oxygen
C
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Which of the following is true about the important Bergeron precipitation process?
A) More water vapor can exist in air that is in contact with ice than in air that is in contact with liquid water, regardless of temperature. B) Less water vapor can exist in air that is in contact with ice than in air that is in contact with liquid water, regardless of temperature. C) Less water vapor can exist in air that is in contact with ice than in air that is in contact with liquid water, even if both are at the same temperature. D) More water vapor can exist in air that is in contact with ice than in air that is in contact with liquid water, even if both are at the same temperature.
The earliest crust was probably ____
a. rich in precious metals b. composed of felsic igneous rock c. composed of ultramafic rock d. very similar to the one of today e. composed of basaltic rock
Vertebrates first appeared in the ____
a. Cambrian b. Devonian c. Permian d. Mississippian e. Ordovician
Which type of chemical bond is usually the strongest?
A. Van der Waals B. Covalent C. Ionic