Share POLYMERS Y9
Save to Folder
What does the prefix "poly" mean in relation to polymers?
Poly means "many".
What does the term "meros" mean in relation to both polymers and monomers?
Meros means "unit".
What is the definition of a polymer?
Polymers are large molecules made up of long chains of repeated groups of atoms.
What are the small molecules used to make the polymer chain called?
Monomers.
What analogy is used to describe a monomer?
A strand of paper clips.
All plastics are formed from chains of smaller molecules and belong to what major category of substances?
Polymers.
What process links small molecules together to form polymer chains?
Addition polymerization.
What type of molecule is condensed to form Cellulose?
Glucose molecules.
What molecule is released when glucose molecules are condensed to form cellulose?
Molecules of water.
Name one major component that cellulose is a part of.
Wood, paper, cotton...
Definition of exothermic?
Reactions that transfer energy to the surroundings.
What are cross links defined as?
Strong chemical bonds between the long polymer molecules.
How do cross links change the polymer structure?
They add strong chemical bonds between the polymer molecules.
What common polymer-based material is used in the practical session?
PVA glue.
What solution is mixed with PVA glue to add cross links to the polymer?
Borax solution.
Predict one change in property of PVA glue when borax is added.
The PVA should become less runny / less flexible / more stretchy.
