Flashcards
Limestone (Flashcards)
Flashcards do conjunto (14)
- 1What is the chemical equation of the thermal decomposition of limestone?CaCO3(s) > CaO(s) + CO2(g)
- 2What is limestone, mainly?Calcium carbonate
CACO3
- 3What is the resulting process of heating limestone called?Thermal decomposition
- 4What other elements/compounds have the same chemical equation when thermally decomposing?Magnesium, copper, zinc and sodium carbonates.
- 5What is the chemical equation of limestone reacting with sulfuric acid?CaCO3 + H2SO4 > CaSO4 + CO2 + H20
- 6What other carbonates react with acids?Magnesium, copper, zinc and sodium.
- 7Calcium oxide + water = ?Calcium hydroxide - Ca(OH)2
- 8What is a use of calcium hydroxide in fields and why?It can be used to neutralise acidic soil.
Powdered limestone can be used too but calcium hydroxide is much quicker.
- 9How can it also be used as a test?By making a solution of calcium hydroxide in water, called limewater.
- 10What is it a test for?Carbon dioxide - CO2
- 11How can you tell if the test comes out positive?The water will turn cloudy.
- 12Why is this?Because of the formation of calcium carbonate.
- 13What is the formula?Ca(OH)2 + CO2 > CaCO3 + H2O
- 14Name three things that limestone can also be used for/to make?Cement, mortar and concrete.
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