C3.6 Structure of simple molecules

Question 1

Why do substances of simple molecules have low melting points and low boiling points?

Answer 1

• Because the forces between simple molecules are weak.

- These weak intermolecular forces expain why substances made of simple molecules have low melting and boiling points.

Question 2

Why do simple molecular substances NOT conduct electricity?

Answer 2

• Because there is no overall charge on simple molecules

- So they cannot carry electrical charge.

Question 3

Why are there limitations of using models to represent molecules or gaint structures?
-e.g 2D diagrams,3D diagrams,dot and cross,and ball and stick.

Answer 3

• Because it isnt close to reality,how molecules or strucutres really look
• e.g 2D ball and stick model does show which atoms are bonded to eachother but doesnt show the true shape of the model.

Question 4

What do intermolecular forces do to molecules?

Answer 4

They INCREASE the size of the molecules.

Question 5

What are Polymers?

Answer 5

Polymers are made up of small reactive molecules that bond to form a long chain.