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O level combined chem > collecting and drying gases > Flashcards

collecting and drying gases Flashcards

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1
Q

what is the displacement of water used to collect?

A

insoluble/slightly soluble gases in water
e.g. H2,O2.CO2

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2
Q

what is downward delivery used to collect?

A

gases that are denser than air Mr>29

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2
Q

what is calcium oxide/quicklime (CaO) used to dry?

A

ammonia (NH3)

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2
Q

what is upward delivery used to collect?

A

gases that are less dense than air Mr<29

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2
Q

what is fused calcium chloride (CaCl2) used to dry?

A

Nitrogen (N2), Hydrogen (H2), Oxygen (O2) only

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3
Q

what is concentrated sulfuric acid (H2SO4) used to dry?

A

hydrogen chloride (HCL), Chlorine (Cl2), carbon dioxide (CO2) only

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3
Q

why can’t acids, e.g. concentrated sulfuric acid, be used to dry ammonia?

A

They will react

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3
Q

what experimental technique is used to collect carbon dioxide?

A

displacement of water

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4
Q

what experimental technique is used to collect chlorine?

A

downward delivery

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4
Q

what experimental technique is used to collect nitrogen?

A

upward delivery

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4
Q

what is used to dry oxygen?

A

fused calcium chloride (CaCl2)

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5
Q

what is used to dry hydrogen chloride?

A

concentrated sulfuric acid (H2SO4)

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5
Q

what is used to dry ammonia?

A

calcium oxide/quicklime (CaO)

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O level combined chem (21 decks)

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