Take this Quiz: GCSE Chemistry: Structure and Properties | Zestly

Question 1

Which of the following statements correctly describes the movement and arrangement of particles in a substance as it transitions from a solid to a liquid?

Accepted Answer

Particles gain enough energy to overcome some forces of attraction, allowing them to slide over each other.

Question 2

Simple molecular substances like methane ($CH_4$) have very low melting and boiling points. What is the primary reason for this?

Accepted Answer

The intermolecular forces between the molecules are weak and require little energy to overcome.

Question 3

Which of the following statements accurately describe the structural properties of diamond and graphite?

Accepted Answer

Diamond consists of a giant covalent structure where each carbon atom is bonded to four others.

Question 4

Why are alloys, such as steel, generally harder and more durable than pure metals like iron?

Answer

Alloys contain stronger covalent bonds than pure metals.

Answer

The different sizes of atoms in an alloy distort the regular layers, preventing them from sliding over each other.

Answer

Alloys have more delocalized electrons than pure metals, creating stronger metallic bonds.

Answer

The atoms in an alloy are packed more tightly than in a pure metal.

Question 5

Which of the following are true regarding the structure and properties of graphene and fullerenes?

Answer

Graphene is a single layer of graphite, making it extremely strong and conductive.

Answer

Fullerenes are giant covalent structures that extend indefinitely in all directions.

Answer

Fullerenes can be used as lubricants or to deliver drugs due to their hollow, cage-like structure.

Answer

Graphene is an insulator because it lacks delocalized electrons.