E = Avogadro's constant / Limestone cycle

Question 1

What is Avogadro’s constant?

Answer 1

The number of particles in one mole of an element or compound

6.02 * 10^23

Question 2

Formula for:

1-Limestone
2-Lime
3-Limewater
4-Carbon dioxide

Bond type for each one as well

Answer 2

1-CaCO3 (ionic)

2-CaO (ionic)

3-Ca(OH)2 (ionic)

4-CO2 (covalent)

Question 3

Describe the experiment of thermal decomposition of limestone

Answer 3

LIMESTONE CYCLE

1-Heat a measured mass of limestone (CaCO3)

2-CaCO3 will break down to give calcium oxide (CaO) and carbon dioxide (CO2)

CaCO3 —> CaO + CO2

3-Add water (reaction is exothermic) to make slaked lime (another name for limewater). Ca(OH)2

4-Add more water (Reaction is exothermic) to make more limewater

5-Precipitation reaction to produce CO2

Question 4

Uses of limestone (4)

Answer 4

• Bathroom tiles
• Bricks
• Cement
• Manufacturing of iron

Question 5

Process of obtaining limestone

Answer 5

Quarrying

Question 6

What is limestone composed of?

Answer 6

It’s a rock that is formed over many years from crushed animal skeletons