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Why are chemical reactions useful?
They help make new substance or materials.
What does 'reactive' mean?
How easily a substance reacts.
What are bubbles during a reaction a sign of?
Gas being produced.
What type of change is copper turning green?
Chemical change
Name one chemical property?
Reacts with water/ react with acid/.....
Name one physical property
Colour/ shape/ state/ density
Which change forms new substances?
Chemical change
Why is potassium stored under oil?
To stop it reacting with air and water(water vapour)
What is produced when potassium reacts with water?
Hydrogen gas and heat
What happens when magnesium reacts with acid?
Magnesium chloride and hydrogen gas
Why is rusting irreversible?
A new substance is formed
What is chemical change?
A change that forms new substances
What is physical change?
A change where no new substance is formed/ often reversible/ only physical properties change
Is reacting with acid a chemical property?
yes
Is colour a physical or chemical property?
Physical property
What sound confirms hydrogen?
A squeaky pop
