Ethyne Flashcards

1
Q

Balanced eq for production of ethyne in lab

A

Cac(2) + 2h(2)o = ca(oh)(2) + c(2)h(2)

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2
Q

Describe appearance of calcium dicarbide

A

Grey lumpy solid

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3
Q

What does the reaction feel like towards the end of ex and why

A

Hot as reaction is exothermic

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4
Q

How is ethene collected explain why

A

Over water as ethyne is non polar and water is polar

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5
Q

Describe what u see when ethyne burns

A

Yellow/ smoky flame

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6
Q

How would u demonstrate that ethyne is unapsaturated

A

Shake with bromine water goes red / brown to colourless

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7
Q

Describe the apperance and smell of ethyne

A

Colourless gas and sickly sweet smell

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8
Q

Chemical eq for combustion of ethyne

A

C(2)h(2) + 2and a half o (2)=2co(2) + h(2)o

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9
Q

Ethyne is passed through a blue liquid what is it and what is it’s purpose

A

Acidified copper (2) sulphate solution / remove impurities

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10
Q

Name an impurity often found in ethyne and the substance that produces it

A

Phosphine/ calcium phosphide

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11
Q

Name and describe the substance left in reaction vessel at the end of the experiment

A

Calcium hydroxide / white/ powder/ with bigger volume

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12
Q

Give another name for ethyne and a common use for it

A

Actelyne/ oxyacetylene burner / for cutting wielding steel

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13
Q

What does unsaturated hydrocarbon mean

A
Unsaturated =  contains at least one c to c double or triple bond 
Hydrocarbons= consist of hydrogen and carbon only
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14
Q

Labels on diagram

A

A is water
B is calcium dicarbide
C is ethyne
D is water

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