C1D - Polymers Flashcards
What is made in a polymerisation reaction ?
Polymers
What are the two elements chemically combined in a hydrocarbon ?
ONLY hydrogen and carbon
How does polymerisation work ?
Small molecules called monomers join together to form large molecules called polymers
Ethene is an alkene which has just taken part in a polymerisation reaction. What would we call it now ?
Polyethene
Draw the displayed formula of propene when it transforms into polypropene
What are addition polymers made from ?
Unsaturated monomers
How is something an unsaturated compound ?
It has a double bond
Explain in terms of bonds how polymers are formed ?
Unsaturated monomer molecules (alkenes) can open up their double bonds and join together forming long polymer chains
Alkenes have double bonds. True or false ?
True
John says that alkenes are saturated but Julie also says alkanes are saturated ? Who is right and why ?
Julie is right. Alkanes are saturated because they have single bonds but John is wrong as alkenes have double bonds making them unsaturated
Bromine water tests for what ?
Unsaturation ( double bonds )
How will we know if an unsaturated compound is present ?
If bromine water turns from Orange to colourless
How does bromine water work ?
It breaks the double bonds and bonds instead with the alkene forming s dibromoalkane therefore changing its colour
Why won’t alkanes form polymers ?
No double bonds to open up
What hold atoms in a molecule together ?
Covalent bonds
