Chapter 2: Rocks And Building Materials Flashcards
What is the chemical formulas of calcium carbonate?
CaCO3
What was chalk formed from?
The remains of animals and plants that lived millions of years ago.
What is cement made from?
Powdered limestone and powdered clay
What is concrete made up of?
Cement, sand and water
What is thermal decomposition?
The breaking down of a chemical by heat.
What is the symbol equation after calcium carbonate has been under thermal decomposition?
CaCO3—CaO + CO2
What is a rotary lime kiln?
A furnace that turns calcium carbonate into calcium oxide.
How do buildings made of limestone feet damaged?
Damaged by acid rain. This is because carbonates react with acid to form salt, water and carbon dioxide.
What is the word and symbol equation for the reaction of calcium carbonate and hydrochloric acid?
Calcium carbonate + hydrochloric acid — calcium chloride + water + carbon dioxide.
CaCO3 + 2HCl— CaCl2 + H2O + CO2
Why does limewater turn cloudy when CO2 goes into it?
Because a precipitate of calcium carbonate forms.
What do metal carbonates form when decomposed on heating?
Metal oxide and carbon dioxide
What is limestone mainly made out of?
Calcium carbonate
We can use limestone to make other materials in the construction industry. What are they?
Calcium carbonate + heat —calcium oxide
Calcium oxide + water — calcium hydroxide.
What is mortar made from?
Cement sand and water
What are the benefits of limestone mines?
- provides jobs
- leads to improved roads
- can be filled in to become fishing lakes or for planting trees.
- can be used as landfill sites when finished with.
