Archive for the ‘10th Science’ category

Chemistry X | Carbon and its Compounds | OXIDATION OF CARBON COMPOUNDS

June 20th, 2010

OXIDATION

You have learnt about oxidation reactions in the first Chapter. Carbon compounds can be easily oxidised on combustion. In addition to this complete oxidation, we have reactions in which alcohols are converted to carboxylic acids.

clip_image002

We see that some substances are capable of adding oxygen to others. These substances are known as oxidising agents.

Alkaline potassium permanganate or acidified potassium dichromate are oxidising alcohols to acids, that is, adding oxygen to the starting material. Hence they are known as oxidising agents.

» Read more: Chemistry X | Carbon and its Compounds | OXIDATION OF CARBON COMPOUNDS

Share

Chemistry X | Carbon and its Compounds | Combustion OF CARBON COMPOUNDS

June 20th, 2010

CHEMICAL PROPERTIES OF CARBON COMPOUNDS

In this section we will be studying about some of the chemical properties of carbon compounds. Since most of the fuels we use are either carbon or its compounds, we shall first study combustion.

Combustion

Carbon, in all its allotropic forms, burns in oxygen to give carbon dioxide along with the release of heat and light. Most carbon compounds also release a large amount of heat and light on burning. These are the oxidation reactions that you learnt about in the first Chapter –

(i) C + O2 → CO2 + heat and light

(ii) CH4 + O2 → CO2 + H2O + heat and light

(iii) CH3CH2OH + O2 → CO2 + H2O + heat and light

Balance the latter two reactions like you learnt in the first Chapter.

Activity 4.3

CAUTION: This Activity needs the teacher’s assistance.

  1. Take some carbon compounds (naphthalene, camphor, alcohol) one by one on a spatula and burn them.
  2. Observe the nature of the flame and note whether smoke is produced.
  3. Place a metal plate above the flame. Is there a deposition on the plate in case of any of the compounds?

» Read more: Chemistry X | Carbon and its Compounds | Combustion OF CARBON COMPOUNDS

Share