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Chemistry 🧪 > Gases 🧪 > Flashcards

Gases 🧪 Flashcards

1
Q

CO2 lab prep

A

CaCO3 + 2HCl —> CaCl2 + H2O + CO2
Observations:
Bubbles
Exothermic

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2
Q

Industrial prep

A

Thermal decomposition of CaCO3 at +1000 degrees
CaCO3 —> CaO + CO2

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3
Q

Properties of CO2

A

Colour less
Odourless
Denser than air
Slightly soluble
Doesn’t support combustion

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4
Q

Major uses of CO2

A

Fire extinguisher
Fizzy drinks
Dry ice

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5
Q

test and result of CO2

A

Pass the gas through lime water Ca(OH)2 (aq)
Colour less—> milky white

Ca(OH)2 + CO2 —> CaCO3 + H2O

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6
Q

Lab prep of H2

A

Mg + 2HCl —> MgCl2 +H2
Observations:
Bubbles of gas
Exothermic

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7
Q

Industrial prep of H2

A

Electrolysis of sea water
2NaCl + 2H2O —> 2NaOH + Cl2 + H2

CH4 + 2H2O —> CO2 + 4H2
On heating 800 degrees and Ni as catalyst

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8
Q

Properties of H2

A

Colourless
Odourless
Less dense than air
Insoluble in H2O
Explosive gas

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9
Q

Uses of H2

A

Manufacturing margarine
Manufacturing NH3
Rocket Fuel

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10
Q

Lab prep of O2

A

2H2O2 —> 2H2O + O2

MnO2 as catalyst

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11
Q

Industrial prep of O2

A

Fractional distillation of liquified air

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12
Q

Properties of O2

A

Odourless
Colourless
Denser than air
Supports combustion
Slightly soluble in H2O

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13
Q

Test and result for O2

A

Glowing splint relights

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14
Q

Uses of O2

A

Artificial breathing
Oxy-acetylene flame to cut and weld metals
Steel manufacturing

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15
Q

Lab prep of SO2

A

NaSO3 + 2HCl —> 2NaCl + H2O + SO2

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16
Q

Lab prep of SO2

A

S + O2–> SO2

17
Q

Properties of SO2

A

Colourless
Rotten egg smell
Highly soluble in H2O
Acidic

18
Q

Test and result of SO2

A

Acidified KMnO4 (aq)
Purple —> colourless

Acidified K2Cr2O7 (aq)
Orange—> green

19
Q

Uses of SO2

A

Paper industry (bleaching)
Food industry (antioxidant) prevents the growth of bacteria
Making H2SO4

20
Q

Lab prep of NH3

A

NH4NO3 + NaOH —> NaNo3 + H2O + NH3

21
Q

Industrial prep of NH3

A

N2 + 3H2–> 2NH3

22
Q

Properties of NH3

A

Colourless
Pungent smell
Alkaline gas
Highly soluble in H2O
Less dense than air

23
Q

Physical test and result for NH3

A

Damp red litmus paper turns blue

24
Q

Chemical test and result NH3

A

Dip a glass rod into HCl dense white fumes form when introduced

25
Q

Uses of NH3

A

Fertilizers
Coolants

26
Q

Lab prep of Cl2

A

MnO2 + 4HCl —> MnCl2 + 2H2O + Cl2

27
Q

Industrial prep Cl2

A

Electrolysis of brine
2NaCl + 2H2O —> 2NaOH + H2 + Cl2

28
Q

Test and result for Cl2

A

Blue to red litmus paper then white (bleaching property)

29
Q

Properties of Cl2

A

Bleaching property
Greenish yellow gas
Denser than air
Acidic
Choking smell
Highly soluble in H2O

30
Q

Uses of Cl2

A

Drinking water And pools to kill bacteria
To make PVC poly vinyl chloride

Chemistry 🧪 (10 decks)

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