Chemical Properties Of Alkanes (LEC)

Question 1

Alkanes as well as other hydrocarbons undergo Combustion with the oxygen. What is Combustion?

Answer 1

Combustion is the burning in the presence of oxygen.

Question 2

What does combustion of alkanes produce and evolve into?

Answer 2

RH + 2O2 = CO2 + 2H2O + # kcal, wherein;

• Carbon dioxide and water are the chemical products, and
• Heat energy is evolved form of combustion

Question 3

Evolved heat energy can be converted to:

Answer 3

Mechanical and electrical energy

Question 4

Alkanes are relatively inert; therefore, they are non-reactive with __________

Answer 4

Aqueous reagents, such as water solution of acids, bases, oxidizing agents, reducing agents, etc.

Question 5

Alkanes react only in these conditions:

Answer 5

• With powerful reagents,
• Under conditions of high temperatures, and;
• Under pressure or in presence of catalysts

Question 6

This test is used to differentiate unsaturated hydrocarbons from saturated hydrocarbons.

Answer 6

Baeyer’s Test for Unsaturation

Question 7

In Baeyer’s test, what reagent is used?

Answer 7

Potassium Permanganate or KMnO4

Question 8

What results when alkanes are tested with Baeyer’s test?

Answer 8

• Alkanes do not react because they are saturated— the test doesn’t work

Only works with unsaturated hydrocarbons