Atom, rocks and materials (8H) Flashcards
What are physical properties? Give 5 examples
Physical properties can be observed without changing the material
• colour
• melting point
• flexible
• hard
• boiling point
• malleable
• strong
• electrical conductivity ductile
• dense
• thermal conductivity
What are chemical properties? Give 3 examples.
Chemical properties are how things react
• Reactivity
• oxidation
• flammability
• corrosion
• How does it burn?
What are ceramics? What are their properties? Name 3
Ceramics are non-metallic solids
General properties: high melting points, poor thermal, electrial conductors, Brittle (not flexible)
What are the 2 main cermics?
Clay and glass
What is a common use of ceramics? Give 2
Bricks, pottery, oven proof dishes
Define composites
Composites are a type of material made from 2 different types of substances that have been combined together
Give 2 examples of composite material
Fibreglass, carbon fibre and concrete
What are polymers?
All are very long molecules formed by joining together lots of smaller molecules called monomers join together
Are polymers considered insulators?
Yes
What are the 3 types of weathering in rocks?
Chemical, physical and biological/ freeze-thaw action.
What is biological/ freeze-thaw action?
Biological weathering is caused by the movements of plants and animals. For example, a rabbit can burrow into a crack in a rock making it bigger and eventually splitting the rock, or a plant may grow in a crack in a rock and, as its roots grow, cause the crack to widen.
What is chemical weathering?
The erosion or disintegration of rocks, building materials, etc., caused by chemical reactions (chiefly with water and substances dissolved in it) eg. Oxidation
What is physical weathering?
Physical weathering, also called mechanical weathering, is a process that causes the disintegration of rocks, mineral, and soils without chemical change.
