Station 2

What happens to the glowing splint when it meets oxygen

• it relights

• bubbles appear

• Squeaky pop

• it turns into colorless

to test the presence of Carbon dioxide we can use...................

Mr. Tuan Anh choose the reagents for the substances as below:

Glowing splint => Oxygen

Fiery splint => Carbon dioxide

Limewater => Hydrogen

Is he correct?

• Correct

• Incorrect

Which one is NOT a chemical change

• Ice melting

• Coal burning

• Metal was corroded by acid

• Making toast

What is the reactants of this reaction:

Ca(OH)₂ + CO₂ => CaCO₃ + H₂O

• Ca(OH)₂

• CO₂

• CaCO₃

• H₂O

When a metal react with acid, it produces

• hydrogen

• salt

• sugar

• water

when an alkali metal reacts with acid, it produces

• Hydrogen

• Oxygen

• Carbon dioxide

• Nitrogen

When Mr Tuan Anh puts the fiery splint into the test tube, he heard a squeaky pop. It means inside the test tube has:

• Hydrogen

• Oxygen

• Carbon dioxide

• Nitrogen

Which is NOT a clue of a chemical reaction taking place?

• Gas appears

• Flask is broken

• Colour chages

• Reactants disappear

Write down 3 things you have to do and in the lab