Structure of Matter | | 1. | An element consists of three isotopes in the relative abundance given below. What is the atomic mass of this element? | | 30.00% = 40.00 amu50.00% = 41.00 amu20.00% = 42.00 amu | | (A) | 40.90 | | (B) | 41.00 | | (C) | 41.90 | | (D) | 42.20 | | (E) | 42.90 | | | 2. | The total number of electrons that can be accommodated in the fourth principal energy level is _____ | | (A) | 2 | | (B) | 8 | | (C) | 18 | | (D) | 32 | | (E)
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DELHI PUBLIC SCHOOL DAGAPUR ‚ SILIGURI (Affiliated to C.B.S.E.) Session :- 2012-13 Topic : Study of effect of Potassium bisulphite as a food preservative Submitted To: Submitted By: Mr. B.GHOSH H.O.D. Chemistry 12th Science Roll no. = Certificate This is to certify that s/o Mr. Amar Singh is a bonafide student of class XIIth Science during session 2012-2013. He has completed his project on Study of effect of Potassium bisulphite
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Atmospheric Issues Appendix L Name SCI /275 Date Instructor Axia College Material Appendix L Air Pollution Chart After reviewing Ch. 8 and 9 of your text‚ complete the following table‚ then respond to the questions that follow: Issue Sources Health/Environmental Effects Carbon dioxide (CO ) Industries and Motor Reduces your bloods ability to move oxygen 2 Vehicles. throughout your body. Lower levels can cause fatigue and headaches. High levels cause death and mental impairment
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Background Information about Investigation The rates of chemical reactions in industry are carefully controlled because ‘Time is money!’ So it is important that chemists can make reactions happen and make useful products as quickly as possible. However‚ sometimes chemists deliberately slow down reactions to avoid health and safety risks. Some reactions can go out of control and lead to large amounts of toxic or flammable gases being made too quickly. One chemical that is made industrially is sodium
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Cbse-spot.blogspot.com 1 Class IX Chapter 15 – Probability Maths Exercise 15.1 Question 1: In a cricket math‚ a batswoman hits a boundary 6 times out of 30 balls she plays. Find the probability that she did not hit a boundary. Answer: Number of times the batswoman hits a boundary = 6 Total number of balls played = 30 Number of times that the batswoman does not hit a boundary = 30 − 6 = 24 Question 2: 1500 families with 2 children were selected randomly‚ and the following data were
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by which the concern is able to define the role positions‚ the jobs related and the co- ordination between authority and responsibility. Hence‚ a manager always has to organize in order to get results. Elements of Organizing A manager performs organizing function with the help of following elements:- 1. Identification of activities - All the activities which have to be performed in a concern have to be identified first. For example‚ preparation of accounts‚ making sales‚ record keeping‚ quality
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Ionization Energy - energy required to remove an electron increases moving left to right decreases moving top to bottom Electron Affinity - ability to accept an electron alkaline earth elements have low electron affinities halogens have high electron affinities noble gases have electron affinities near zero other element groups tend to have low electron affinities Electronegativity - measure of the attraction to form a chemical bond increases moving left to right decreases moving top to bottom
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You might ask yourself what one of the most common elements used would be. Well I’m here to tell you that it is nitrogen! One of the biggest users of Nitrogen is all of the plants around the world; especially the crops that we grow for food. This is perhaps why it is one of the most important elements also. All the food around the world comes from the crops that are grown some way or another. However‚ the odorless and colorless gas‚ nitrogen‚ cannot be used in the state found naturally in our
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Elements of Persuasion Persuasion has been defined as “the process by which a message induces change in beliefs‚ attitudes‚ or behaviors” (Myers‚ 2010‚ p. 230). Utilizing the elements of persuasion are important when searching for effective ways to reach a given audience. Educating individuals about domestic violence and the affects it can have can be beneficial in many ways and communicating the message can be accomplished using a variety of methods. One of the largest misconceptions is
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Short stories came into the literature world as brief‚ single sitting stories‚ yet containing an exclusively developed subject. A short story is packed with descriptive details that form together to grab the reader’s attention in a short amount of time. The authors indulge in rich details to create the narrative into a jaw dropping meaning story from the beginning to the ending. The author begins with constructing the story with the building blocks of literary devices. Short story authors apply the
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