carbonates and limestone

Question 1

what is the chemical name for limestone?

Answer 1

calcium carbonate

Question 2

what is the chemical formula for calcium carbonate?

Answer 2

CaCO3

Question 3

what happens when you heat limestone?

Answer 3

it glows white (where the theatrical term limelight comes from)
it undergoes THERMAL DECOMPOSITION to make calcium oxide and carbon dioxide

Question 4

what do we use limestone for?

Answer 4

• as a building material ( for making walls)
• it can be used as cement when heated with clay
• it can be made into glass when mixed with sand and sodium carbonate
• to make statues

Question 5

what do we use cement for ?

Answer 5

• when cement is mixed with sand and water we call it MOTAR and use it to join bricks
• when mixed with sand, water and pebbles/aggregate we call it concrete and use it as foundations for roads and houses

Question 6

limewater is used to test a gas for oxygen?

true or false

Answer 6

FALSE - we use it to test if a gas is CARBON DIOXIDE

Question 7

what happens to limewater if carbon dioxide is added?

Answer 7

it turns coudy

Question 8

what happens in the lime cycle?

Answer 8

1) limestone (Calcium carbonate/CaCO3) is heated in the presence of oxygen.
2) carbon dioxide gas is produced along with quicklime (calcium oxide/CaO)
3) when a little water is added it produces slaked lime (calcium hydroxide/Ca(OH)2)
4) when more water is added we get limewater
5) when carbon dioxide is added to limewater we get calcium carbonate