Ethyne

Question 1

Balanced eq for production of ethyne in lab

Answer 1

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

Question 2

Describe appearance of calcium dicarbide

Answer 2

Grey lumpy solid

Question 3

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

Answer 3

Hot as reaction is exothermic

Question 4

How is ethene collected explain why

Answer 4

Over water as ethyne is non polar and water is polar

Question 5

Describe what u see when ethyne burns

Answer 5

Yellow/ smoky flame

Question 6

How would u demonstrate that ethyne is unapsaturated

Answer 6

Shake with bromine water goes red / brown to colourless

Question 7

Describe the apperance and smell of ethyne

Answer 7

Colourless gas and sickly sweet smell

Question 8

Chemical eq for combustion of ethyne

Answer 8

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

Question 9

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

Answer 9

Acidified copper (2) sulphate solution / remove impurities

Question 10

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

Answer 10

Phosphine/ calcium phosphide

Question 11

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

Answer 11

Calcium hydroxide / white/ powder/ with bigger volume

Question 12

Give another name for ethyne and a common use for it

Answer 12

Actelyne/ oxyacetylene burner / for cutting wielding steel

Question 13

What does unsaturated hydrocarbon mean

Answer 13

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

Question 14

Labels on diagram

Answer 14

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