Limestone

Question 1

What is limestone formed from??

Answer 1

Seashells

- sedimentary rock (built up in layers) made from millions of years through the compression of shells and skeletons

Question 2

What is limestones chemical name?

Answer 2

Calcium Carbonate

Question 3

What are the 8 uses of limestone?

Answer 3

• Building materials
• Statues (made out of marble)
• Cement
• Mortar
• Concrete
• Glass
• Neutralising agent
• Pharmaceutical & industrial products-paint

Question 4

What is the word equation for cement?

Answer 4

Limestone + clay —-> cement (powdery)

—>
Heat added

Question 5

What is the word equation for mortar?

Answer 5

Cement + sand + water–> mortar

Question 6

What is the word equation for concrete?

Answer 6

Cement + gravel + sand + water –> concrete

Question 7

What is the word equation for glass?

Answer 7

Sand + limestone –> glass

–>
Heat added

Question 8

What is the equation of the neutralisation reaction??

when calcium carbonate also reacts with acid

Answer 8

Calcium carbonate + sulfuric acid –> calcium dilate + carbon dioxide + water

CaCO3 + H2SO4 –> CaSO4 + CO2 + H2O

Question 9

When limestone is heated up, what happens?

Answer 9

It thermally decomposes to make calcium oxide & carbon dioxide

CaCO3 –> CaO + CO2

Question 10

What is the formula and salt of hydrochloric acid?

Answer 10

HCl , chloride

Question 11

What is the formula and salt of sulphuric acid?

Answer 11

H2SO4 , sulphate

Question 12

What is the formula and salt of nitric acid?

Answer 12

HNO3 , Nitrate

Question 13

Recall the lime cycle

Answer 13

1) Calcium carbonate is heated (thermal decomposition) to produce calcium oxide and CO2
2) water is added to produce calcium hydroxide, CaO + H2O –> Ca(OH)2
3) More water is added to calcium hydroxide to produce limewater , –> Ca(OH)2 (aq)
4) CO2 is added to line water to produce limestone

Question 14

Name the 4 stages/ products made in the lime cycle

Answer 14

1) Limestone- CaCO3
2) Quicklime- CaO
3) Slaked lime- Ca(OH)2
4) Limewater - Ca(OH)2 (aq)

Question 15

What reaction is stage 3 of the lime cycle?

Answer 15

An exothermic reaction - gives out heat

Question 16

What is the test for CO2?

Answer 16

Bubble CO2 through clear limewater and if it goes cloudy then CO2 is present

Question 17

What are the advantages to quarrying Limestone??

Answer 17

1) It produces useful products such as building materials, glass and paint
2) it provides jobs
3) increases wealth of local economy

Question 18

What is the chemical formula of limestone?

Answer 18

CaCO3

Question 19

What are the disadvantages of quarrying Limestone?

Answer 19

1) It destroys habitats
2) it creates an aesthetically poor view-BLOT on landscape
3) Produces air-pollution (dust)
4) Produces noise pollution (tremors- structural damage)
5) The traffic congestion causes air-pollution and noise pollution
6) produces CO2 leading to climate change and global warming