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Chemistry IGCSE > Gas Preparation > Flashcards

Gas Preparation Flashcards

1
Q

What are the uses of Oxygen?

A
  • Ventilation
  • Welding
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2
Q

What is the reaction for making oxygen?

A

Decomposition: 2H₂O₂ → 2H₂O + O₂

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3
Q

What is the catalyst and what is in the separating funnel in the making of oxygen?

A

catalyst: MnO₂

separating funnel: H₂O₂

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4
Q

What is the apparatus called in the preparation of gases?

A

trough (container)
delivery tube
separating funnel
conical flask
GAS JAR

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5
Q

what is the test for oxygen?

A

glowing splint: splint re-ignites

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6
Q

DON’T COLLECT THE FIRST BITS OF OXYGEN

A

ok…

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7
Q

What is the use for carbon dioxide?

A

fire extenguishers

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8
Q

what is the reaction for the preparation of CO₂?

A

CaCO₃ + HCl → CaCl₂ + H₂O + CO₂

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9
Q

does carbon dioxide react with water? what is the equation?

A

yes it does

CO₂ + H₂O → H₂CO₃

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10
Q

what is the test for CO₂?

A

limewater → colorless to cloudy

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11
Q

metal + acid →

A

salt + hydrogen

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12
Q

what metals are used in the preparation of hydrogen?

why

A

Mg or Zn because they aren’t too reactive or unreactive

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13
Q

what is the reaction for preparing hydrogen?

A

Mg + HCl → MgCl₂ + H₂
Zn + HCl → ZnCl₂ + H₂

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14
Q

What is the test for hydrogen?

what is the equation H₂ + O₂ →

A

burning splint: explodes with a pop

H₂ + O₂ → H₂O

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15
Q

What are the properties of Hydrogen?

A
  • Low mpt
  • Does not conduct
  • Insoluble in water
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16
Q

What are the uses of Chlorine?

A
  • disinfectant in swimming pools
  • kills bacteria
  • in drinking water
17
Q

what is the reaction with chlorine for HCl?

A

Cl₂ + H₂O → HCl + HOCl

18
Q

what is the reaction using the catalyst and reactant for the preparation of Chlorine?

A

MnO₂ + 4HCl → MnCl₂ + 2H₂O + 2Cl₂

19
Q

why do we use downward delivery when preparing Chlorine?

A

because chlorine is more dense than air

20
Q

Air is consisting of…

A

78% Nitrogen
21% Oxygen
0.03% Carbon Dioxide
0.97% Argon

Chemistry IGCSE (9 decks)

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