EXP 8: Properties of Alkanes & Alkynes

Hexane (C6H14)

What is the name and formula of the alkane in this experiment?

Acetylene Gas (C2H2)

What is the name and formula of the alkyne in this experiment?

Preparation of Acetylene Gas

What is the name of Part A?

Calcium Carbide (CaC2)

(Part A) What is the name and formula of the substance water is added to to create acetylene gas?

Calcium Hydroxide (Ca(OH)2)

(Part A) What is the name and formula of the substance water and calcium carbide create aside from acetylene gas?

Acetylene Gas (C2H2)

(Part A) What is the name and formula of the alkyne that water and calcium carbide create?

CaC2 + 2H2O —> C2H2 + Ca(OH)2

(Part A) What is the chemical equation that occurs in this part of the experiment?

Baeyer’s Test for Unsaturation

What is the name of Part B.1?

Baeyer’s Test

(Part B.1) What is the name of the test for unsaturation?

Potassium permanganate (KMnO4)

(Part B.1) What is the name and formula of the substance added to each acetylene gas and hexane to test for unsaturation?

Purple

(Part B.1) What is the color of potassium permanganate?

No reaction

(Part B.1) What chemically occurs between the potassium permanganate (KMnO4) and hexane (C6H14)?

Separation layer forms with purple on top and darker purple bottom

(Part B.1) What is visibly observed between the potassium permanganate (KMnO4) and hexane (C6H14)?

Formation of Brown Precipitate

(Part B.1) What is visibly observed between the potassium permanganate (KMnO4) and acetylene gas (C2H2)?

Brown Manganese Oxide (MnO2)

(Part B.1) What is the color, name, and formula produced by the reaction between the potassium permanganate (KMnO4) and acetylene gas (C2H2)?

3C2H2 + 10KMnO4 + 2H2O —> 10MnO2 + 6CO2 + 10KOH

(Part B.1) What is the chemical equation between acetylene gas and potassium permanganate?

C6H14 + 12KMnO4 —> No Reaction

(Part B.1) What is the chemical equation between hexane and potassium permanganate?

Bromine Water (Br2)

(Part B.2) What is the name and formula of the substance added to hexane and acetylene gas?

Creation of a separation layer

(Part B.2) What visibly occurs between the hexane and bromine water?

Sunlight

(Part B.2) What is the hexane and bromine water exposed to for a reaction to occur?

Becomes colorless

(Part B.2) What visibly occurs between the hexane and bromine water after being exposed to sunlight?

Forms a clear yellow solution

(Part B.2) What visibly occurs between the acetylene gas and bromine water?

1,1,2,2-tetrabromoethane (C2H2Br4)

(Part B.2) Give the name and formula of the organic product of the reaction from acetylene and bromine gas.

Bromohexane (C6H13Br)

(Part B.2) Give the name and formula of the organic product of the reaction from hexane and bromine gas after being exposed to sunlight.

C6H14 + Br2 (sunlight —>) HBr + C6H13Br

(Part B.2) What is the chemical equation between hexane and bromine water after exposed to sunlight?

Iodine Test

(Part B.3) What is the name of the test?

Formation of separation layer with purple on top and orange on bottom

(Part B.3) What visibly occurred when iodine was added to hexane?

Homogenous reddish-brown color

(Part B.3) What visibly occurred when iodine was added to acetylene gas?

Ignition Test for Alkane

(Part B.4) What is the name of the test?

Hexane (C6H14)

(Part B.4) What substance is ignited?

Yellow

(Part B.4) What is the color of the flame?

Acetylene (C2H2)

(Part B.5) What substance is cuprous chloride added to?

Ammoniacal Cuprous Chloride (Cu2Cl2 & NH4OH)

(Part B.5) What is the name and formula of the substance added to acetylene gas?

Blue

(Part B.5) What is the color of the ammoniacal cuprous chloride?

Chocolate Brown Cuprous Acetylide (Cu2C2)

(Part B.5) What is the color, name, and formula of the product of the reaction between cuprous chloride and acetylene?