Flashcards in C1.2 Rocks and Building Materials Deck (21):
What is limestone made from?
Limestone can be formed by...
remains of tiny animals and plants
what does powdered limestone and clay make?
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?
What is the test for carbon dioxide?
turns limewater cloudy
calcium carbonate+hydrochloric acid=
calcium chloride+water+carbon dioxide
What do metal carbonates form when thermally decomposed?
metal oxides and carbon dioxide
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?
What is mortar used for?
holding bricks together
calcium hydroxide+carbon dioxide=
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