CHEMISTRY C1 5

Pregunta	Respuesta
How do we make smaller, more useful hydrocarbon molecules from big hydrocarbon molecules?	Mix them with steam and heating them to a high temperature or passing the vapours over a hot catalyst
What does cracking hydrocarbons produce?	Saturated hydrocarbons that are used as fuel and unsaturated hydrocarbons
What is an unsaturated hydrocarbon?	An alkene, alkenes react with orange bromine water, turning it colourless. Alkenes are double bonded
What are plastics made out of?	Polymers
What are polymers?	Large molecules created when monomers join together. This is called polymerisation
What are smart polymers?	Polymers that may have their properties changed by temperature, light or other changes in their surroundings
What are hydrogels?	Polymers that can trap water, they are used for contact lenses
What are plastic bottles made out of?	PET
What does biodegradable mean?	When something can be decomposed by the actions of microorganisms in soil
What can we make biodegradable plastics from?	Plant material such as cornstarch
What are the two methods used to create ethanol?	fermentation and hydration
What is fermentation?	Enzymes in yeast breakdown the sugar into ethanol and carbon dioxide gas
What is hydration?	When ethene gas is reacted with steam in the presence of a catalyst to produce ethanol

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