Carbondioxide
The carbon dioxide gas should be collected by the upward displacement of air. This is a note gives an about information about carbon dioxide, its molecular formula, structure, preparation, properties and uses.
Summary
The carbon dioxide gas should be collected by the upward displacement of air. This is a note gives an about information about carbon dioxide, its molecular formula, structure, preparation, properties and uses.
Things to Remember
- When calcium carbonate (marble or limestone) is treated with dilute hydrochloric acid, carbon dioxide is produced. CaCO3 + 2HCl→ CaCl2 + H2O + CO2
- The carbon dioxide gas should be collected by the upward displacement of air.
- Carbon Dioxide is used to manufacture of soda water, coca cola and other soft drinks.
- Carbon Dioxide is also used as a refrigerant for preserving food or cooling agent in the refrigerator.
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Q1:
What is an index?
Type: Very_short Difficulty: Easy
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Answer: <p>An index is a guide which helps in searching and finding out a particular topic in book, particular account in a ledger book, particular letter in the file and particular file in a filing cabinet.</p>
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What are the importances of indexing?
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Answer: <p>Indexing is a part of filing. Indexing can be regarded as the eye and sight of the filing system of an organization which shows the location and position of the particular information. The following points highlight the importance of indexing in filing: -</p> <ol><li>Indexing helps to locate the required information or files promptly.</li> <li>It helps to arrange a large number of files in a drawer or cabinet in a systematic order.</li> <li>It helps to maintain the secrecy of the information and documents.</li> <li>It gives the detail information of the correspondent like name, address, telephone number, file number, financial position and trading and manufacturing items.</li> <li>It provides a summary of the records for the quick reference.</li> </ol>
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What is indexing? Explain its importance in filing.
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Answer: <p>An index is a guide which helps in searching and finding out a particular topic in book, particular account in a ledger book, particular letter in the file and particular file in a filing cabinet. It is a means of arranging a large number of files in a definite order.</p> <p>According to J.C. Denyer, “An index is anything that indicates or points out. Its prime function is to act as a guide to a body of data or to the collection of funds.”</p> <p>Hence, an index is an essential part of filing which provides a ready reference. It is an indicator or guide. It means indicating or pointing out. It is the indicator for locating a particular file, letter, and document. It is the act of showing the location and position of data, information and document preserved in the office.</p> <p>Indexing is a part of filing. The indexing system is closely related with the filing system. Without indexing, the filing system becomes ineffective. The objective of filing is to locate the required information and documents promptly. Such promptness in locating the information and document is possible through indexing. Indexing brings rapidity and effectiveness in filing. Indexing can be regarded as the eye and sight of the filing system of an organization which shows the location and position of the particular information. The following points highlight the importance of indexing in filing: -</p> <ol><li>Indexing helps to locate the required information or files promptly.</li> <li>It helps to arrange a large number of files in a drawer or cabinet in a systematic order.</li> <li>It helps to maintain the secrecy of the information and documents.</li> <li>It gives the detail information of the correspondent like name, address, telephone number, file number, financial position and trading and manufacturing items.</li> <li>It provides a summary of the records for the quick reference.</li> <li>It saves time and effort while searching out a document by providing a ready reference.</li> <li>It increases the efficiency of the staff in carrying out their assigned duties.</li> <li>It also brings rapidity and efficiency in filing and other regular functions of the office.</li> </ol>
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Carbondioxide
Molecular Formula: CO2
Molecular weight: 44
Molecular structure:
Laboratory preparation
Principle: When calcium carbonate (marble or limestone) is treated with dilute hydrochloric acid, carbon dioxide is produced.
CaCO3 + 2HCl -----------> CaCl2 + H2O + CO2
Precautions
- The carbon dioxide gas should be collected by the upward displacement of air.
- The apparatus must be made airtight.
- The end of the thistle funnel should be dipped in the acid of the round bottom flask.
- The end of the delivery tube should not touch the acid inside the round bottom flask
Lesson
Some Gases
Subject
Science
Grade
Grade 10
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