What does dry air consist of?

Elements?
Compounds?

How much of each gas is in the atmosphere?

What are the symbols for the main gases which make up the air?

Most non-metals and most compounds between non-metals are m_______.

Molecular elements and elements with small molecules have ______ melting and boiling points.

What form do molecular elements take at room temperature?

Why?

Do pure molecular compounds conduct electricity?

Why?

What is covalent bonding?

How does it arise?

Are covalent bonds strong?

What does the hydrosphere consist of?

How are the ions in crystals of a solid ionic compound arranged?

What is ionic bonding?

What happens to the ions when an ionic crystal dissolves in water?

Why do ionic compounds conduct electricity when dissolved in water?

How can ions in ionic compounds be detected?

Some metal ions can be identified in solution by adding a______ because they form i______ h_______ with characteristic colours.

Some n_______ i_____ can be identified in solution by adding a r_____ that reacts with ions to form an i_______ s_____.