Answer to Question #160280 in General Chemistry for Smayya Ruganyira

Question

20. Graphite and diamond are allotropes of carbon with different physical properties a)Write 1 physical property of:

•Graphite

•Diamond

b)Write the chemical equation of the reaction between carbon(c) and iron oxide(Fe₂O₃)

c)State 1use of:

•Graphite

•Diamond

d) Carbon reacts with oxygen during combustion according to equation C(s)+O2(g)———>CO₂(g)

In insuffient oxygen the reaction below take place

2C(s)+O2(g)———>2 CO(g)

•Mention 2 important uses of CO2 in nature

•State 1 important and on danger of CO gas

e)Carbon dioxide causes global warming. Describe 2 means of reducing carbon dioxide(CO2) from the atmosphere.

f)Marble rock that is formed of carbohydrates can be degraded by acid rain

•Write the equation of the reaction between calcium carbonate(CaCO3) and hydrochloric acid(HCl)

•Temporary hard water containing hydrogen carbonate(HCO3-) indicate one means that is used to soften (eliminate)HCO3- from hard water

Answer 1

a) • Graphite has a high melting point, similar to that of diamond. In order to melt graphite, it isn't enough to loosen one sheet from another. You have to break the covalent bonding throughout the whole structure.

• Diamond sublimes at ordinary pressures at almost 4000°C. Very strong carbon-carbon covalent bonds have to be broken throughout the structure before sublimation occurs.

b) 3C + 2Fe₂O₃ $\to$ 4Fe + 3CO₂

c) • Graphite uses as lubricant

• Diamond uses in jewellery

d) • Carbon dioxide is one of the most abundant gasses in the atmosphere. 

• Carbon dioxide plays an important part in vital plant and animal process, such as photosynthesis and respiration.

• CO inhibits the blood's ability to carry oxygen to body tissues including vital organs such as the heart and brain

• Carbon monoxide is harmful when breathed because it displaces oxygen in the blood and deprives the heart, brain and other vital organs of oxygen

e) • Forests. Photosynthesis removes carbon dioxide naturally — and trees are especially good at storing carbon removed from the atmosphere by photosynthesis.

• Bio-energy with Carbon Capture and Storage (BECCS)

f) • CaCO₃ + 2HCl $\to$ CaCl₂ + H₂O + CO₂

• Yes