C1.2 Rocks and Building Materials Flashcards
What is limestone made from?
calcium carbonate
Limestone can be formed by…
remains of tiny animals and plants
what does powdered limestone and clay make?
cement
How do you make concrete?
cement, water, sand and crushed rock
calcium carbonate + heat=
calcium oxide+calcium carbonate
where does thermal decomposition take place?
in a rotary kiln
What is use of limestone?
building material
What is the test for carbon dioxide?
turns limewater cloudy
carbonate+acid=
salt+water+carbon dioxide
calcium carbonate+hydrochloric acid=
calcium chloride+water+carbon dioxide
What do metal carbonates form when thermally decomposed?
metal oxides and carbon dioxide
calcium oxide+water=
calcium hydroxide
What is the limestone cycle?
heat calcium carbonate, form calcium oxide, add water to form calcium hydroxide, add more water to form calcium hydroxide solution, add carbon dioxide to form calcium carbonate
What is calcium hydroxide used for?
make soils less acidic for farmers
what does calcium hydroxide, sand and water produce?
mortar
What is mortar used for?
holding bricks together
calcium hydroxide+carbon dioxide=
calcium carbonate+water
What is a disadvantage of lime mortar?
it doesn’t harden very quickly
What can you do add to mortar to make it set more quickly?
they add small rocks and it sets to form concrete
Disadvantages of quarrying limestone
destroy animal habitats, disrupt schools in the area, noise pollution, air pollution, kill crops
Advantages to quarrying limestone
more jobs available, new roads, trade raw materials, more business
