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Chemistry > To Prepare Ethyne And Examine Its Properties > Flashcards

To Prepare Ethyne And Examine Its Properties Flashcards

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1
Q

What is observed as you drop water onto the calcium chloride

A

Fizzing/bubbling. Milky colour forms

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2
Q

What is the formula for calcium chloride?

A

CaC2

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3
Q

Explain why the first few test tubes of gas were discarded

A

They contain air

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4
Q

State an observation made when ethyne is burned in oxygen(combustion)

A

Sootier. Flame is very bright

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5
Q

Balanced chemical equation for the compete combustionof ethyne in oxygen

A

C2H2 + 2.5 O2 ==> 2CO2 + H2O

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6
Q

Write a chemical equation for the preparation of ethyne

A

CaC2 +H2O ==> C2H2 + Ca(OH)2

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7
Q

Descirbe how you would test for unsaturation in ethyne

A

Add acidified potassium permanganate. Purple to colourless indicates unsaturation .
Add bromine water. Brown to colourless indicates unsaturation

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Chemistry (19 decks)

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