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Which of the following statements most accurately describes the relative locations of the covalently bonded electrons in methane (CH4) and ammonia (NH3)?

Electrons are shared equally in and unequally in .

How many electrons are involved in a single covalent bond?


You isolate a molecule and determine it is nonpolar. Based on this property, the molecule is largely composed of the elements _____

carbon and hydrogen

Can the atomic mass of an element change?

Yes. Adding or losing neutrons will change the atomic mass without forming a different element

_____ atoms give organic molecules their overall shape; _____ atoms determine the overall chemical behavior of organic molecules.

Carbon; H, N, and O

Which statement best explains the physical basis for why oil and water don't mix?

Oils are nonpolar molecules that cannot interact with water molecules via hydrogen bonding

Which of the following properties of water come about because of water's polar bonds and bent structure?

-Water has a high cohesiveness, or ability for water molecules to stick together.
-Water has a high adhesiveness, or ability for water molecules to stick to other polar molecules.
-Liquid water is denser than solid water (ice).

Why is carbon so important in biology?

It forms up to four covalent bonds.

Which list shows the correct positions of the molecules on an electron-sharing continuum, with equal sharing on the left and no sharing (i.e., transfer of electrons) on the right?

O2, CO2, CaCl2

You need to write down information about a molecule that gives the most accurate picture of the relative sizes of the atoms involved and their relationship in space. Which representation would work best?

space-filling model

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