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The name of the SO42− ion is ________.

Using the electronegativity table and the rules (which suggest that a difference in electronegativity below 0.4 is equally shared, 0.5–1.7 is polar covalent, and greater than 1.8 is ionic), the bonds in BeBr2 (electronegativity of Be is 1.5 and Br is 2.8) would be classified as ________.

Double Bonds A double bond between two carbon atoms consists of one sigma-type bond and one pi-type bond. Draw a diagram of the double bond orbitals. Briefly describe how a pi bond differs from a sigma bond. Enter the text of your answer in the box below. A diagram with a brief description can be recorded on a separate piece of paper, labeled and numbered clearly, and uploaded as a photo at the end of the exam.

At the end of “Barn Burning,”

The girl in “Hills Like White Elephants” is

A researcher analyzes a rock sample and determines that 87.5% of a parent isotope has decayed into a daughter isotope. Given that the half life of that particular parent isotope is 500,000 years, how old is the sample? 

The ability of sodium chloride to mix with water is most likely due to:

Assuming that the molecules carbon monoxide (CO) and nitrogen (N2) have similar electron clouds, which statement below is TRUE?

  At what point is meiosis II completed for the female gamete?  

  Hormonal and neural changes during pregnancy function to facilitate diffusion of gases across the placenta. One way this occurs is by ________ respiration rate, thereby ________ CO2 levels in the blood.