Chemistry- Polymers Flashcards
Name some examples of ceramics
Bricks, china and glass
Reactions that transfer energy to the surroundings are
Exothermic
What is vulcanisation and what can it do?
The properties of rubber can be changed by a process called vulcanisation. The rubber is heated with sulfur and a reaction occurs that forms cross links between the long molecules.
What is rubber?
Rubber is a polymer obtained from certain trees it is soft and sticky when hot but is hard and brittle when cold
True or false: rubber is not a natural polymer
False
Reactions that absorb energy from the surroundings are
Endothermic
What is a composite material?
They are combinations of two or more materials with some of the properties of each.
What are synthetic polymers made from?
Raw materials from crude oils
Give an example of an composite material
Laminated glass
True or false: concrete is a composite material
True it is made out of cement, sand and aggregate
Why are very high temperatures needed to make cement?
Because it is an endothermic reaction
What can form acid rain?
Sulfur impurities in fuels- sulfur dioxide
What increase the greenhouse effect and is thought to cause global warming and climate change?
Carbon dioxide as it helps trap the suns energy
How can incomplete combustion be reduced
Increase the amount of oxygen available during combustion
What is biodegradability
If a product is biodegradable it means it can naturally break down into soil, this is good for the environment.
