GCSE Chemistry - Covalent Bonding #16

What is the primary difference between covalent and ionic bonds?

• Covalent bonds involve sharing electrons, while ionic bonds involve transferring electrons.

• Covalent bonds involve transferring electrons, while ionic bonds involve sharing electrons.

• Covalent bonds occur between metals, while ionic bonds occur between non-metals.

• Covalent bonds are weaker than ionic bonds.

In a dot and cross diagram, what do the dots and crosses represent?

• The atomic number of the elements

• The bonds between atoms

• The protons and neutrons in the nucleus

• The electrons from different atoms

What is a limitation of displayed formulas?

• They require knowledge of atomic numbers.

• They are too complex for small molecules.

• They cannot represent ionic bonds.

• They do not show the 3D shape of molecules.

How many hydrogen atoms are bonded to nitrogen in ammonia (NH3)?

• Three

• One

• Two

• Four

What is the maximum number of electrons the first energy level of hydrogen can hold?

• Two

• One

• Three

• Four

Which of the following is a simple molecular substance?

• Silicon dioxide

• Water

• Graphite

• Diamond

What are polymers made of?

• Ionic compounds

• Single atoms

• Repeating units called monomers

• Metallic bonds