Flashcards

C2- Material Choices

jahorabegum1 English 35 cards

The melting point of chocolate is 30 degrees.But the melting point of plastic is 200 degrees. Why is it so much higher than…

Cards in this deck (35)

1The melting point of chocolate is 30 degrees.But the melting point of plastic is 200 degrees. Why is it so much higher than choclate?Because there are more stronger forces between molecules in plastic than chocolate.
2What key word means that a material will last a long time?Durable.
3What is the difference between tension and compression?Tension - pulling appart/ being stretched tight.
Compression - pushing together/ an increas in pressure.
4What can fibres be drawn into and then woven together?Wool or Cotton depending if the fibres are man made or natural.
5What are Crude Oil fractions used for?Petrol, Diesel and Fuel for Ships.
6Where do Short Hydrocarbons come out of the coloumn?At the top of the column.
7Where do Long Hydrocarbons come out of the Crude Oil Column?At the bottom of the coloumn.
8If you were to increase the chain length in a Polymer then How would the properties change?They would get stronger, less flexible and have a increase in boiling point.
9If you were to increase the crystallinity in a polymer. How would the properties change?They would get stronger, less flexible and have a higher boiling point.
10If you were to add more Plasticisers in a Polymer. How would the properties change?They would get weaker, more flexible and have a lower boiling point.
11If you were to increase Cross-Linking in a Polymer. How would the properties change?They would get stronger, less flexible and have a higher melting point.
12Why are the bonds in Cross-Linking stronger?Because the Polymer molecules cannot slide over each other so easily.
13Why are the bonds in Chain Lengths stronger?Because longer Polymers have more stronger force of attraction than shorter ones.
14Why are the bonds in Plasticisers weakers?Because they push the polymer molecules slightly further apart, weakening the forces btween them.
15What does Tough mean?It is srong and doesn't change it's shape.
16What does Stiff mean?You need a lot of force to change it's shape
17What dos Flexible mean?You don't need much force to change it's shape.
18What does Ductile mean?You can twist and draw this into wires or fibres.
19What does Malleable mean?Can be sqeezed and bent into new shapes without breaking.
20What does Plastic mean?Keeps a new shape when you deform it.
21What material keeps its shape?Plastic.
22What material is the most tough and long lasting?Fibre.
23What material is the most elastic and flexible?Plastic.
24How do we refine Crude Oil?By Fractional Distillation.
25What does Biodegradable mean?Being decomposed by natural processes (bacteria).
26Name 3 ways of disposing Plastic.Puttin the plastic in Landfills, Incinarating them and Recycling.
27Why are Polymers made from corn 'better' than polymers made from oil?Because corn polymers are cheaper, stronger and are more biodegradable.
28Name the main steps in a life cycle assesment.The main requirements for energy input.
The environmental impact and sustainability of making the materials from natural resources.
The environmental impact of making the product from the material.
The environmental impact of using the product.
The environmental impact of disposing of the product by incineration, landfill or recycling.
29Why do we need the Life Cycle Assesment?Because it helps us to understand how badly the material impacts the environement.
30What is the formula and molecule for oxygen?O2 and
31What is the formula and molecule for Carbon Dioxide?CO2 and
32What is the formula and molecule for Water?H2O and
33What is the formula and molecule for Carbon Monoxide?CO and
34What is the formula and molecule for Methane?CH4 and
35What is the formula and molecule for Nitrogen?NO2 and