2.4 Flashcards
(42 cards)
how is limestone obtained from the ground
quarrying
uses of limestone in the building industry
production of iron/steel
structure of building
uses of limestone in the building industry
mortar
holds bricks or stone blocks together
uses of limestone in the building industry
glass
windows
concrete
roads
limestone to quicklime explanation
limestone is crushed, roasted in a kiln. carbon dioxide is released
limestone to quicklime reaction
heat
limestone (calcium carbonate) —> quicklime (calcium oxide) + carbon dioxide
CaCO3 —> CaO + CO2
quicklime to slakedlime explanation
add water to quicklime.
heat energy is released in the process
quicklime to slakedlime reaction
quicklime (calcium oxide) + water —> slakedlime (calcium hydroxide)
CaO + H2O —> Ca(OH)2
how is cement made
limestone is heated with clay and gypsum
how is mortar made
sand is added to cement and mixed with water
good properties of mortar
strong
cheap
mortar use
holds bricks together
concrete make?
mixing sand cement and stones
property and use of concrete
strong
build whole buildings
how to make glass
sand limestone and calcium carbonate heated
characteristic properties of metals
5
good heat/electrical conductors malleable resistant to corrosion strength hardness
what does it mean to be a good conductor
heat/electricity can travel through them easily
pipes / wires have what two properties?
high melting point
ductile
aluminium 2 properties
light weight
resistant to corrosion
two examples of things made from aluminium
window frames
pans
most polymers are manufactured using…
chemicals attained from crude oil
polymerisation
when are polymers produced?
when many small molecules (monomers) join together to form very large molecules
5 properties of polymers
flexible resistant to corrosion waterproof poor conductors low melting point easy to mould
