fuels and heats - ethyne experiment

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7 Terms

1
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diagram for preparation of ethyne

CaC2 + 2H2O → Ca(OH2) + C2H2

2
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observation

calcium carbide is a grey-black solid

fizzing takes place in the buchner flask

bubbles of gas start to collect in the glass jar

3
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procedure

test tubes are collected

first test tube is left because it has too much air

4
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tests on ethyne: physical properties

colourless gas with sweet smell

5
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combustion

jar is in a fume cupboard

lighted taper - ethyne burns with a luminous smoky flame and soot is formed

6
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addition of bromine

addition of bromine water

colour of bromine water changes from red to colourless

7
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adition of potassium permangante

added to the test tube

potassium permanganate turns from purple to colourless