By Indumati Rao;C.N.R. Rao

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The two gases are separated by liquefaction. Properties of carbon monoxide Physical properties Carbon monoxide is a colourless and odourless gas. not very soluble in water. extremely poisonous. Chemical properties Carbon monoxide does not support combustion. It reacts with chlorine in the presence of sunlight to form phosgene. CO + Cl2 Sunlight COCl2 Phosgene is a very poisonous gas. Carbon monoxide is used to produce many other important chemicals in industry. 0 Acids, bases, salts and valence Sting of bees and wasps Why does the sting of a bee or a wasp hurt us?

As a rule, the atomic number of an element is given below the symbol of the element (as subscript) and the mass number of an element is given above (as superscript). A where, E represents the element, A = the mass number Z and Z = the atomic number. E 1 Example: H1 12 C6 14 N7 23 Na11 Atomic and mass numbers of a few elements Element Hydrogen Helium Lithium Beryllium Boron Carbon Symbol H He Li Be B C Atomic number 1 2 3 4 5 6 Mass number 1 4 6 9 10 12 Learning Science Element Nitrogen Oxygen Fluorine Neon Sodium Magnesium Symbol N O F Ne Na Mg Atomic number 7 8 9 10 11 12 21 Mass number 14 16 19 20 23 24 Atomic mass (weight): Can we weigh an atom?

Oxygen in the Greek language Lavoisier means acid producer. Priestley’s experiment During Priestley’s time, the bunsen burner was not yet invented. He used the heat of the sun to provide the necessary heating for his experiment. He inverted a glass vessel filled with mercury and a small amount of mercuric calx or mercuric oxide in a trough containing mercury. He concentrated the heat from the sun on mercuric oxide by using a burning glass or lens. The heat decomposed the mercuric calx and a gas collected in the glass vessel.

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Learning science : Part 3 : World of chemistry molecules, materials, air, water by Indumati Rao;C.N.R. Rao

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