A sample of nitrogen gas (N2) contains 3. 0 x 1024 atoms of nitrogen. About how many moles of nitrogen gas are in the sample?
1). 1.0
2). 2.5
3). 3.0
4). 5.0


Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?