A covalent bond is:

• A shared electron

• A strong electrostatic force of attraction between ions

• A strong electrostatic force of attraction between atoms

• A shared pair of electrons

A single line drawn between two atoms represents:

• A single covalent bond

• A single electron

• A shared pair of electrons

• A single proton

How many covalent bonds are there in total in a molecule of methane, $CH_4$  ?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-1

How many covalent bonds are there in a single molecule of oxygen, $O_2$   ?

• 1

• 2

• 3

• 4

A covalent bond is strong because:

• There are strong electrostatic forces of attraction between the atoms.

• There are strong electrostatic forces of attraction between the shared electron pair and the two bonding nuclei.

• Electrons are strong.

• Electron pairs are strong.

An anion is:

• An onion which has gone bad.

• A positive ion.

• A negative ion.

• A molecule.

A cation is:

• Another word for a cat.

• A positive ion.

• A negative ion.

• A molecule.

An atom becomes an ion by:

• Losing or gaining protons.

• Losing or gaining neutrons.

• Losing or gaining electrons.

• Losing or gaining mass.

In ionic bonding:

• Atoms give and receive electrons.

• Atoms give and receive electron pairs.

• Atoms give away electrons.

• Atoms gain electrons.

A compound with an -ate ending:

• Contains oxygen only.

• Contains sulphur.

• Contains oxygen in addition to two other elements.

• Contains nitrogen.