Covalent Bonding iGCSE

Covalent bonds are formed between...

• two or more metal atoms

• two or more non-metal atoms

• a metal and a non-metal atom

Tags

NGSS.HS-PS1-1

Covalent bonds are formed when electrons are transferred between atoms.

• True

• False

Atoms can only share electrons in the _____ shell.

• outer
• inner

• empty

• full

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Fluorine is a diatomic molecule. Fluorine is in Group 7. How many electrons are shared in this covalent bond?

• 1

• 2

• 7

• 14

Oxygen is a diatomic molecule. Oxygen is in Group 6. How many electrons are shared in this covalent bond?

• 4
• 6

• 12

• none because it's an element

The structure of ammonia is shown in the diagram. What is the formula for ammonia?

• NH₃

• HN₃

• N3H

• HN³

What are the disadvantages of using displayed formulae, like the one shown over a dot and cross diagram?

CHOOSE 2

• It doesn't show the lone pairs

• It doesn't show the double bonds

• They do not show which atom each electron comes from.

• It doesn't show all the electron shells

Select the properties of simple covalent substances.

• Low melting and boiling points.

• High melting and boiling points.

• Do not conduct electricity.

• Good conductors of electricity.

Tags

NGSS.HS-PS1-1

How many lone pairs does each nitrogen have?

• 1

• 2

• 3

• 5

Tags

NGSS.HS-PS1-1

this is a molecule of hydrogen cyanide.

how many electrons are in the bond between carbon and nitrogen?

• 2

• 3

• 4

• 6

Tags

NGSS.HS-PS1-2