Acid Base And Salt Acid Acids:- The word ‘Acid’ came from Latin word ‘Acidus or Acere’ which means sour. Sour taste is the most common characteristic of acid. Acid turns blue litmus paper red. There are many substances which contain acid and hence taste sour‚ such as curd‚ tamarind‚ lemon‚ etc. Types of Acids:- Acids are divided into two types on the basis of their occurrence – Natural acids and Mineral acids. Natural Acid:- Acids which are obtained from natural sources are called natural
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Investigating the water potential of a potato Aim Osmosis is the movement of water molecules from a region of high water concentration to a low water concentration through a semi-permeable membrane. Our aim is to investigate the water potential of a potato through osmosis‚ by finding the difference in weight before and after the potato has been set in a solution of water‚ sugar or salt. Trial Method Firstly we collected the equipment. This included a scalpel‚ potato cutter‚ and test tubes. Then
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research study aims to identify the effect of the location of the computer shops to the... Methodology is the systematic‚ theoretical analysis of the methods applied to a field of study. It comprises the theoretical analysis of the body of methods
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Five Bases of Power Claudette Irizarry BCOM230 November 19‚ 2012 Katalin Ogle Five Bases of Power There are five bases of power that may be used in a professional environment. Referent power‚ coercive power‚ legitimate power‚ reward power and expert power. Each one of these different types of power is used in different ways to reach the same result. Some forms of power are personal and some are formal. In my professional career I have used at least three of these types of power. Referent
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world’s population which was a bad thing for every other country in Europe. Due to the vast expansion of certain European nations‚ Germany decided to build up their army and navy to combat the development of these nations which then leads into another main cause‚ militarism. When Germany started to develop and expand their army‚ many nations followed suit. Nations would compete with each other to create the largest and most effective military‚ this is referred as an “arms race” . By
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Worksheet - Acids‚ Bases and Salts 1. I am pure water. When heated my pH (increases‚ decreases)‚ because more of my water molecules dissociate. 2. I am a 0.020 M solution of weak acid‚ HA. If I only dissociate to the extent of 1.50%‚ what is the value of my Ka? 3. I am a 0.20 M solution of hydrocyanic acid‚ HCN‚ with a Ka of 4.93 x 10¯ 10 . What is my pH? 4. I am a buffer made from 0.10 M acetic acid and 0.15 M sodium acetate. If the Ka for acetic acid is 1.77 x 10¯ 5 ‚ what is my pH? 5. I am
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STANDARD GRADE BIOLOGY CREDIT LEVEL REVISION QUESTIONS INVESTIGATING CELLS 1. In an investigation‚ three 25 g samples of sultanas were put into separate beakers of distilled water‚ as shown below: After 24 hours‚ the sultanas were removed from the water‚ blotted on filter paper and reweighed. The results are shown in the table: |Sample |Mass after 24 hrs (g) |Percentage change in mass | |1
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violent place. In addition‚ they are more apt to respond with aggression to other seven when
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one of the first theories of crime advanced‚ was the concept of biological positivism. Although this theory has gone in and out of favour over the course of history‚ it should be completely disregarded by criminologists as it is a deeply flawed theory which has little scientific research backing it‚ and has very little practical utility to reducing crime. Biological positivism was first proposed
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Good Essay esp. for an investigation Good Intro to investigation Investigating the antibacterial properties of a mouthwash Introduction The mouthwash under test id Asda Protect. It contains:- · aqua · alcohol · glycerin · polysorbate 20 · sodium benzoate · aroma · sodium saccharin · cetylpyridinium chloride · menthol · sodium flouride (0.05%) In this investigation we aim to test the antibacterial properties of this mouthwash treating it like a disinfectant against three common bacteria
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