Rocks And Building Materials

Question 1

what is limestone mainly made of?

Answer 1

Calcium Carbonate (CaCO3)

Question 2

limestone powder mixed with clay creates what material?

Answer 2

cement

Question 3

how do we make concrete from cement?

Answer 3

Water, cement, sand and crushed rock.

Question 4

breaking down a chemical by heating is called what?

Answer 4

Thermal decomposition.

Question 5

Calcium oxide is often produced in what piece of equipment?

Answer 5

Rotary kiln

Question 6

how does a rotary kiln function?

Answer 6

we fill the kiln with crushed limestone and heat it strongly using a supply of hot air. this then produces Calcium oxide (which comes out the bottom) and the waste product carbon dioxide leaves through the top.

Question 7

how do you test for lime water?

Answer 7

blow through a tube, if it goes cloudy (white precipitate) then it’s like water (it reacts with CO2)

Question 8

when we add water to calcium oxide what do we get?

Answer 8

calcium hydroxide.

Question 9

calcium oxide heated makes what?

Answer 9

calcium oxide + CO2

Question 10

calcium oxide + water = what?

Answer 10

calcium hydroxide

Question 11

calcium hydroxide + more water and filter

Answer 11

calcium hydroxide solution (limewater)

Question 12

limewater + CO2

Answer 12

calcium carbonate

Question 13

calcium hydroxide is an alkali, what industry uses it and for what?

Answer 13

farmers use it to neutralise their soil

Question 14

limestone quarrying is controversial, why?

Answer 14

it creates a huge whole in the ground.