Polymers are made up of monomers. Identify the correct set of monomers for the respective polymer from the pairs below.

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Question 20:
Polymers are made up of monomers. Identify the correct set of monomers for the respective polymer from the pairs below.

• A: Fatty acid and glycerol are the monomers that combine to form fats (triglycerides), which are a type of polymer/macromolecule.
• B, C, and D do not represent common monomer-polymer relationships in this context.

The correct option is A.

Question 1:

a) State the name given to the change of state labeled:

(i) A: The change from liquid to gas is called boiling or evaporation (vaporization).

(ii) B: The change from liquid to solid is called freezing or solidification.

b) Describe the movement of molecules in a gas.
Molecules in a gas are far apart, move randomly and rapidly in all directions, and have high kinetic energy. They collide frequently with each other and the walls of the container.

c) Which of the changes A, B or C is endothermic? Explain your answer.
Change A (liquid to gas) is endothermic.
Explanation: Endothermic processes absorb heat energy from the surroundings. In change A, energy is absorbed to overcome the intermolecular forces holding the liquid particles together, allowing them to move freely as a gas. Changes B (freezing) and C (condensation, gas to liquid) release energy and are therefore exothermic.