SC26 Flashcards
choosing materials
What is a ceramic?
Range of durable compounds that change very little when heated
What are 4 properties of ceramics?
un-reactive, hard, stiff but brittle, high melting points
Why do ceramics have these proporties?
Giant structures with many strong bonds
Give 3 examples of clay ceramics
bricks, porcelain, china
How are clay ceramics made?
Heated at very high temperatures and crystals form and join together
How is glass made?
made by melting sand which cools down and solidify
What to glass and ceramics have in common?
both have giant structures
What makes glass and ceramics different?
glass atoms not formed regularly and don’t make crystals making them transparent
What are some properties of polymers
depends on structure but
- strong, un-reactive, poor conductors
Name the polymer used for underground pipes
PVC
What can you add to polymers to make them softer?
plasticers
What is formed when you add plasticers to PVC
flexible PVC
What is flexible PVC used for
indoor pipes
Some properties of metals
strong, hard, high melting points, malleable, good conductors
What are 2 ways to make metals stronger
- adding dif metals to form alloys
- electroplating with un-reactive metals to resist corrosion
