This gas gives you a squeaky pop when a lit splint is put into it

• Hydrogen
• Oxygen
• Water
• Chlorine
• Carbon dioxide

This gas relights a glowing splint

• Hydrogen
• Oxygen
• Water
• Chlorine
• Carbon dioxide

This gas gives bleaches damp litmus paper from blue to white

• Hydrogen
• Oxygen
• Water
• Chlorine
• Carbon dioxide

This gas turns limewater cloudy when bubbled through limewater

• Hydrogen
• Oxygen
• Water
• Chlorine
• Carbon dioxide

This gas turns calcium hydroxide cloudy when bubbled through limewater

• Hydrogen
• Oxygen
• Water
• Chlorine
• Carbon dioxide

In chemistry pure means..

• nothing has been added to it
• it is made up of only 1 type of element or compound
• It’s a mixture

How can you tell if something isn't pure?

• Melting and boiling point changes
• looks different
• smells different
• heavier

How can you tell if something isn't pure?

• Melting point increases
• Melting point decreases

How can you tell if something isn't pure?

• Boiling point increases
• Boiling point decreases

What is a formulation?

• nothing has been added to it
• it is made up of only 1 type of element or compound
• Useful mixtures with a purpose
• mixture