Covalent Bonds

What best explains how two oxygen atoms, each with six valence electrons, can bond with each other?

Each atom can share two electrons with the other so that each atom has eight valence electrons.

For a science fair project about food and chemistry, Bill looks around his kitchen for examples of covalent compounds. What evidence can Bill use in his project to show that water (H2O) acts like other covalent compounds?

He can demonstrate that water can be boiled on a simple kitchen stove.

Which is most likely a covalent compound?

NOT CaCl2

In carbon dioxide (CO2), there are two oxygen atoms for each carbon atom. Each oxygen atom forms a double bond with carbon, so the molecule is formed by two double bonds. Two double bonds means that the total number of electrons being shared in the molecule is

NOT four.

A candle's wick is the fabric string that holds the flame, and it burns down at a constant slow pace when the candle is lit. The wick is usually surrounded by wax. Which is the most important property of covalent compounds that makes them useful for making candle wax?

a low melting point

Covalent compounds are usually described as

brittle

Which elements can join with other elements to form covalent bonds? Check all that apply.

hydrogen (H) iodine (I) nitrogen (N) carbon (C)

Covalent bonds can be best described as

neutral atoms coming together to share electrons.

The element carbon (C) is most likely to form covalent bonds with the element

selenium (Se).

The compound cyanogen (CN)2 has covalent bonds shown in this diagram. How many electrons are shared between one nitrogen atom and one carbon atom?

six