Limestone And Its Uses

Question 0

What is the symbol equation for calcium carbonate?

Answer 0

CaCO3 ( small 3 )

Question 1

What is limestone mainly made up of?

Answer 1

Calcium carbonate

Question 2

When calcium hydroxide reacts with carbon dioxide what does it produce?

Answer 2

Calcium carbonate

Question 3

What are the ingredients of concrete?

Answer 3

Cement, sand, water and crushed rock

Question 4

If a metal is below Carbon how is it extracted?

Answer 4

By heating with a carbon in a blast furnace.

Question 5

If a metal is above Carbon how is it extracted?

Answer 5

Because these metals have a high reactivity they are extracted using electrolysis.

Question 6

How are low reactivity metals ( eg. silver, gold, platinum) extracted?

Answer 6

They don’t need to be extracted because they are so un-reactive you find them in their NATIVE STATE, on their own not in an ore.

Question 7

What is a metal ore?

Answer 7

A rock containing enough metal to make it economically viable to extract.

Question 8

What is the ‘native state’?

Answer 8

When an unreactive metal is found in its metal form in the ground.

Question 9

How is cement made?

Answer 9

By heating limestone with clay in a kiln.

Question 10

How is glass made?

Answer 10

By heating limestone, sand and sodium carbonate at a very high temperature.

Question 11

How is concrete made?

Answer 11

By mixing crushed rocks (aggregate), cement and sand with water and in a slow chemical reaction it turns into concrete.

Question 12

Why do metals such as: zinc, iron and lead need to be extracted in a chemical reaction?

Answer 12

Because they are reactive so they combine with oxygen in compounds.
When the chemical reaction takes play the metal oxides are reduced and oxygen is removed from the compound.n

Question 13

What happens when you heAt calcium carbonate?

Answer 13

It turns into

Calcium oxide + carbon dioxide

Question 14

What is the order of the limestone cycle ( give the Limey names)

Answer 14

Limestone - Quick lime - Slaked lime - Limewater

Question 15

How does blowing oxygen into molten cast iron remove most of the carbon?

Answer 15

Because when carbon reacts with oxygen it forms carbon dioxide which are the bubbles.

Question 16

Why are different metals sometimes added to molten carbon steels?

Answer 16

To make the steels stronger

Question 17

Why isn’t pure iron useful?

Answer 17

Because it is too soft for most uses so iron can only be helpful if it is bonded with tiny amounts of other elements.

Question 18

What is a blast furnace used for?

Answer 18

Reducing iron ore or haematite.

Question 19

Give two properties of Aliminium?

Answer 19

• very reactive

- dosent easily corrode

Question 20

List 3 properties of titanium?

Answer 20

• very strong and resistant to corrosion
• low density
• can withstand high temperatures

Question 21

Iron oxide + Carbon monoxide = ?

Answer 21

Iron + carbon dioxide

Question 22

What is thermal decomoposition?

Answer 22

The breakdown of a substance by heat.

Question 23

What is electrolysis?

Answer 23

The breakdown of a substance containing ions by electricity.

Question 24

What is a displacement reaction?

Answer 24

When a chemical is more reactive than what it is reacting with and thus displaces it.

Question 25

When does the physical change occur in the limestone cycle?

Answer 25

Only after calcium hydroxide has dissolved in lime

Question 26

List the 4 main points of the limestone cycle?

Answer 26

Limestone ( calcium carbonate )
-heated strongly
Turns into quick lime ( calcium oxide)
-water is added
Turns into slaked lime ( calcium hydroxide)
- slaked lime is dissolved into water WHEN PHYSICAL CHANGE OCCURS
Turns into limewater ( calcium hydroxide)
- carbon dioxide is added to limewater

..

Question 27

How would you write:
Potassium + oxygen

And what is the rule?

Answer 27

Rule : the non metal goes second and gets an ide on the end

So if would be : potassium oxide

Question 28

What are the two waste gases in a limestone kiln?

Answer 28

Carbon dioxide and methane