its about study of the constituents of alloy. done for cbse project work. just copy and make some editsFull description
tatti kha lena paad key
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Class 12th , topic- preparation of rayons thread from filter paper.
A simple and easy to make liquid soap project without any errors. enjoy:)Full description
Coconut water practical
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metal coupling on rusting of ironFull description
it is a systematic analysis of the qualitative and quantitative aspects of cold drinksFull description
hiFull description
Class 12 chemistry investigatory
Content Analysis of HoneyFull description
Chemistry Investigatory Project on FOOD ADULTERATION. It is a full project on food adulteration for 11th & 12th class students.
Chemistry Investigatory Project on Elevation in Boiling Point of Solutions containing various solutesFull description
CHEMISTRY INVESTIGATORY PROJECT
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Subject Subje ct Teacher ..………………………
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This project is prepared by ALOK
KUMAR of class XII in Kendriya Vidyalaya No 1, Sector 30, Gandhinagar under the guidance of our chemistry teachers, Mr. AK JHA Mrs. ANITA NAIR
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Formation and structure Phenol-formaldehyde resins, as a group, are formed by a step-growth polymerization reaction that can be either acid acid-- or base base-catalyzed. -catalyzed. Phenol is reactive towards formaldehyde at the ortho and para sites (sites 2, 4 and 6) allowing up to 3 units of formaldehyde to attach to the ring. The initial reaction is formation of a hydroxymethyl phenol: HOC6H5 + CH2O → HOC6H4CH2OH
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The hydroxymethyl group is capable of reacting with either another free ortho or para site, or with another hydroxymethyl group. The first reaction gives a methylene bridge, and the second forms an ether bridge: HOC6H4CH2OH + HOC6H5 → (HOC6H4)2CH2 + H2O
The diphenol (HOC 6H4)2CH2 is called bisphenol F. F. Bisphenol-F can further link generating tri- and tetraand higher phenol oligomers. 2 HOC6H4CH2OH → (HOC6H4CH2)2O + H2O CHEMISTRY INVESTIGATORY PROJECT
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Beaker
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Phenol
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Conc. HCl
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Dropper
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Water
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Rod
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Filter paper
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Formaldehyde CHEMISTRY INVESTIGATORY PROJECT
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Phenol resins are condensation polymerization products of phenolic derivatives with aldehyde such as formaldehyde. Most important member of this class is Bakelite, phenol formaldehyde resin. Its prepared by condensing phenol with formaldehyde in the presence of acidic or basic catalyst.
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Take 5 ml of glacial acetic acid and 2.5 ml of 40% formaldehyde in a beaker. Add 2.5g of phenol into it. Cover the beaker with watch glass or filter filter paper paper.. Add few drops of HCl to it and place it on hot plate. Pink mass will be formed in the beaker.
Wash, dry and weigh the product formed. CHEMISTRY INVESTIGATORY PROJECT
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Pink mass i.e. phenol formaldehyde (Bakelite) is yielded.
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The reaction is sometimes vigorous and it is better to be little away from the beaker while adding conc. HCl. Phenol should be stirred in the formaldehyde solution for at least 10 mints to make it a saturated solution. Conc. hydrochloric acid should be added drop wise carefully.