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Simple chemical reaction
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What is physical properties?
Things you can observe without changing the substance
Metal + acid -------------> what product?
Salt + hydrogen gas
What are reactants?
Substances present at the start of a reaction
What are products?
New substances formed after a reaction
Name one sign of a chemical reaction
What gas is produced when metals react with acids?
Hydrogen gas
How do you test for hydrogen gas??
With a ligeted splint
What sound confirms hydrogen?
A squeaky pop
Is colour a physical or chemical property?
Physical property
Is reacting with acid a chemical property?
yes
What is physical change?
A change where no new substance is formed/ often reversible/ only physical properties change
What is chemical change?
A change that forms new substances
Why is rusting irreversible?
A new substance is formed
What happens when magnesium reacts with acid?
Magnesium chloride and hydrogen gas
What is produced when potassium reacts with water?
Hydrogen gas and heat
Why is potassium stored under oil?
To stop it reacting with air and water(water vapour)
Which change forms new substances?
Chemical change
Name one physical property
Colour/ shape/ state/ density
Name one chemical property?
Reacts with water/ react with acid/.....
What type of change is copper turning green?
Chemical change
What are bubbles during a reaction a sign of?
Gas being produced.
What does 'reactive' mean?
How easily a substance reacts.
Why are chemical reactions useful?
They help make new substance or materials.
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