Chemistry Engineering Question:

Which of the following is a nonpolar molecule:

1. HCl
2. NaCl
3. CaCl
4. H2

Answer: D

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Element A is a nonmetal with an electronegativity value of 3.0 and element B is a nonmetal with an electronegativity value of 2.5. What kind of bonding will occur between these two elements:	If a human being were to be exposed suddenly to the surface of Mars, which of the following would most likely occur to the person’s blood: