C12.3 Testing for gases Flashcards

1
Q

How can hydrogen gas be produced?

A

Zinc + Sulfuric acid which makes Zin sulfate + hydrogen

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2
Q

How can you collect hydrogen?

A

Collect hydrogen over water

Collect hydrogen by upward delivery(downward displacement of air)

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3
Q

How can you test for hydrogen gas?

A

Hold a lighted splint at the open end of the test tube

Positive test for hydrogen - a lighted splints pops

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4
Q

How can you make some oxygen gas?

A

The decomposition of hydrogen peroxide solution with a little Maganese Iv oxide is added as a catalyst

Which makes water +oxygen

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5
Q

How can you test for oxygen?

A

Insert a glowing splint ( made by blowing out a lighted splint) in the mouth of the flask

Positive for oxygen gas: A glowing splint relights

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6
Q

How can you make carbon dioxide?

A

Reacting marble chips and dilute hydrochloric acid

Which makes calcium chloride + water + carbon dioxide

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7
Q

How can you test for CO2?

A

Bubble the gas collected through limewater (Calcium hydroxide solution)

Positive test for CO2 : limewater turns milky (cloudy white)

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8
Q

How can you make chlorine gas?

A

Add concentrate HCL to a spatula of moistened potassium manganate VII crystals in a boiling tube held in a rack inside a fume cupboard

A piece of damp blue litmus paper can be held in the mouth of the boiling tube

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9
Q

What is the purpose of a fume cupboard?

A

Designed to capture and remove air-borne hazardous substances generated during laboratory experiments

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10
Q

How can you test for Chlorine?

A

Positive for Chlorine gas: a damp blue litmus paper turns white ( as it gets bleached)

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11
Q

Why does hydrogen pop with a lighted splint?

A

As the hydrogen reacts with oxygen in the air in a small explosion

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