Pretest

Question 1

Which diagram represents an element that is likely to form covalent bonds?

Revolt · Accepted Answer

Image with description A purple circle with 3 concentric circles around it. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 5 small green spheres.

Question 2

Why can a hydrogen atom form a covalent bond without fulfilling the octet rule?

Revolt · Accepted Answer

Hydrogen’s valence shell can hold only up to two electrons.

Question 3

Which best describes most covalent compounds?

Revolt · Accepted Answer

brittle

Question 4

Walls made of paraffin wax, a covalent compound, help keep the temperature in a room steady as night changes into day and day into night. What is the most important property of covalent compounds that allows paraffin wax to help keep a room’s temperature level?

Revolt · Accepted Answer

The wall would absorb extra heat during the day when the sun is out, then release the heat back into the room when the sun goes down.

Question 5

Covalent bonds can be best described as

Revolt · Accepted Answer

neutral atoms coming together to share electrons.

Question 6

After a covalent bond has stabilized an atom, the atom will have

Revolt · Accepted Answer

a full valence electron shell.

Question 7

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?

Revolt · Accepted Answer

a low melting point

Question 8

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 contains two sets of double bonds. Two sets of double bonds means that the total number of electrons being shared in the molecule is

Revolt · Accepted Answer

eight.

Question 9

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

Revolt · Accepted Answer

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

Question 10

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 open paren cap h sub 2 cap o close paren acts like other covalent compounds?

Revolt · Accepted Answer

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

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