Gas Preparation
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What are the uses of Oxygen?
• Ventilation • Welding
What is the reaction for making oxygen?
Decomposition: 2H₂O₂ → 2H₂O + O₂
What is the catalyst and what is in the separating funnel in the making of oxygen?
catalyst: MnO₂ separating funnel: H₂O₂
What is the apparatus called in the preparation of gases?
trough (container) delivery tube separating funnel conical flask GAS JAR
what is the test for oxygen?
glowing splint: splint re-ignites
DON’T COLLECT THE FIRST BITS OF OXYGEN
ok…
What is the use for carbon dioxide?
fire extenguishers
what is the reaction for the preparation of CO₂?
CaCO₃ + HCl → CaCl₂ + H₂O + CO₂
Does carbon dioxide react with water? If it does, write the symbol equation, if it doesn’t, why?
yes it does CO₂ + H₂O → H₂CO₃
what is the test for CO₂?
limewater → colorless to cloudy
metal + acid →
salt + hydrogen
what metals are used in the preparation of hydrogen? why
Mg or Zn because they aren’t too reactive or unreactive
what is the reaction for preparing hydrogen?
Mg + 2HCl → MgCl₂ + H₂ Zn + 2HCl → ZnCl₂ + H₂
What is the test for hydrogen? what is the equation H₂ + O₂ →
burning splint: explodes with a pop H₂ + O₂ → H₂O
What are the properties of Hydrogen?
• Low mpt • Does not conduct • Insoluble in water
What are the uses of Chlorine?
• disinfectant in swimming pools • kills bacteria • in drinking water
what is the reaction with chlorine for HCl?
Cl₂ + H₂O → HCl + HOCl
what is the reaction using the catalyst and reactant for the preparation of Chlorine?
MnO₂ + 4HCl → MnCl₂ + 2H₂O + 2Cl₂
why do we use downward delivery when preparing Chlorine?
because chlorine is more dense than air
Air is consisting of…
78% Nitrogen 21% Oxygen 0.03% Carbon Dioxide 0.97% Argon