Physical Science 6.2 & Covalent Bonds Gizmo

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Multiple Choice

What attractions hold two atoms in a molecule together?

• attraction between ions with opposite charges

• attraction between the nuclei of the atoms and shared electrons

• attraction between each nucleus and the electrons of the other atom

• attraction between the molecule and other molecules

Multiple Choice

What determines whether a molecule is polar?

• type of atoms and shape of molecule

• mass of atoms and number of valence electrons

• type and mass of atoms

• ionization energy and number of covalent bonds

Multiple Choice

Why does water have a much higher boiling point than methane?

• Methane molecules are more polar, so its molecules have stronger attractive forces

• Partial charges on the polar water molecules increase attractive forces between molecules

• A water molecule has much more mass than a methane molecule, so water has a higher boiling point

• Water has a higher boiling point because its molecules do not contain carbon atoms

Multiple Choice

In this model of a molecule of ammonia, NH₃, how many covalent bonds are represented?

• 1

• 2

• 3

• 4

Multiple Choice

The image shows two nitrogen atoms. For these two atoms to form a stable molecule, N₂, how many electrons would have to be part of covalent bonds?

• 0

• 2

• 4

• 6

Multiple Choice

How many covalent bonds are there in one molecule of carbon dioxide, CO₂?

• 0

• 2

• 4

• 6

Multiple Choice

Bromine is a halogen, one of the elements in the same column of the periodic table of elements as fluorine. Like fluorine, one bromine atom can form a diatomic covalent molecule with another bromine atom. Which of the following images represents a stable molecule of bromine, Br₂? (Note: Inner electrons have been hidden.)

• A

• B

• C

• D

Multiple Choice

Hydrogen cyanide is poisonous liquid that has a faint, almond-like smell. One molecule of hydrogen cyanide (HCN) is made up of one hydrogen atom, one carbon atom, and one nitrogen atom, shown below. Which of the answer choices shows the correct Lewis dot diagram for hydrogen cyanide?

• A

• B

• C

• D