what's an indicator?
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What's in a name? On indicators, measures and metrics According to the definition adopted by USAID, an indicator is: A quantitative or qualitative variable that provides reliable means to measure a particular phenomenon or attribute. (USAID Glossary of Evaluation Terms, March 2009)
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- Many indicators work by producing a color change when they react with a material. Indicators can be qualitative, only indicating the presence or absence or a substance, or quantitative, indicating how much of a substance is present. A solution of iodine and potassium iodide can be used as a qualitative indicator for starches. What is Starch? Plants make starch, a polymer chain of individual glucose sugar molecules, to store energy for future use.
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- An indicator is a chemical compound that changes colour and structure when exposed to certain conditions and is therefore useful for chemical tests. Litmus, for example, is … an indicator that becomes red in the presence of acids and blue in the presence of bases.+ 19 others found this useful. MikizuNg Vasabi.ndicator is a process which is used to find out the substanceis acid,base and salt. example: litmus paper and termuric both are natural indicator. example of artificial indic … ator: mithyl orange and phenolphtaceil. 4 people found this useful.
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- Substance called indicators can be used to test for the presence of organic compounds. An indicator is a substance that changes color in the presence of a particular compound. In this investigation, you will use several indicators to test for the presence of lipids, carbohydrates, and proteins in various foods.
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Acid - Base Indicators and Titrations Acid - Base indicators (also known as pH indicators) are substances which change colour with pH. They are usually weak acids or bases, which when dissolved in water dissociate slightly and form ions. Consider an indicator which is a weak acid, with the formula HIn. The acid and its conjugate base have different colours. At low pH values the concentration of H3O+ is high and so the equilibrium position lies to the left.
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Economic indicator An economic indicator is a statistic about an economic activity. Economic indicators allow analysis of economic performance and predictions of future performance. One application of economic indicators is the study of business cycles. Economic indicators include various indices, earnings reports, and economic summaries.
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Bioindicator Overview[edit] A bio indicator is an organism or biological response that reveals the presence of the pollutants by the occurrence of typical symptoms or measurable responses, and is therefore more qualitative.
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Acid-Base Indicator Definition and Examples Acid-Base Indicator Definition. An acid-base indicator is either a weak acid or weak base that exhibits a color change as the concentration of hydrogen (H+) or hydroxide (OH-) ions changes in an aqueous solution. Acid-base indicators are most often used in a titration to identify the endpoint of an acid-base reaction.
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Definitions &Translations indicator (Noun). Any of many substances, such as litmus, used to indicate the concentration of a substance, or the degree of a reaction. indicator (Noun). A plant or animal whose presence is indicative of some specific environment.
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A Beginner's Guide to Economic Indicators 1 Acyclic: An acyclic economic indicator is one that has no relation to the health of the economy and is generally of little use. 2  The number of home runs the Montreal Expos hit in a year generally has no relationship to the health of the economy, so we could say it is an acyclic economic indicator.
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Indicator function Basic properties. The indicator or characteristic function of a subset A of some set X, maps elements of X to the range {0,1}. This mapping is surjective only when A is a non-empty proper subset of X. If A ≡ X, then 1A = 1. By a similar argument, if A ≡ ø then 1A = 0.
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pH indicator Acid-base-indicators: A graphic view. A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions (H 3 O +) or hydrogen ions (H +) in the Arrhenius model.
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clock time indication - a datum about some physical state that is presented to a user by a meter or similar instrument; he could not believe the meter reading; the barometer gave clear indications of an approaching storm. meter reading, reading.
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Chemical indicator Chemical indicator: Chemical indicator,, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such
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Economic indicator Equities as leading, GDP as coincident, and business credit as lagging indicator. Economic indicators can be classified into three categories according to their usual timing in relation to the business cycle: leading indicators, lagging indicators, and coincident indicators.
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indicator 2. a: a substance (as litmus) used to show visually (as by change of color) the condition of a solution with respect to the presence of a particular material (as a free acid or alkali) b: tracer 4b.
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pH indicator Normally, the indicator causes the color of the solution to change depending on the pH. Indicators can also show change in other physical properties; for example, olfactory indicators show change in their odor. At 25 °C (77 °F), considered the standard temperature, the pH value of a neutral solution is 7.0.
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- Keuffel & Esser 1745 map measure with three dials reading to 12 inches, 10 feet and 100 feet. The instrument is zeroed by pushing down the button. This is an earlier instrument than the previous two with more rounded edges to the case.
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What Is a Chemical Indicator? By Anne Marie Helmenstine, Ph.D. Indicator Definition: An indicator is a substance that undergoes a distinct observable change when conditions in its solution change. Examples: A pH indicator changes color over a narrow range of pH values in solution.
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How Is an Indicator Defined in Chemistry? In chemistry, an indicator is defined as a substance that undergoes distinct observable change when the conditions of its solution change. Litmus is the most commonly used indicator in the... In chemistry, an indicator is defined as a substance that undergoes distinct observable change when the conditions of its solution change. Litmus is the most commonly used indicator in the laboratory. Indicators are substances that change color when they are added to acidic or alkaline solutions.
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Theory: It is a chemical reagent used to recognize the attainment of end point in a titration. After the reaction between the substance and the standard solution is complete, the indicator should give a clear colour change. When a titration is carried out, the free energy change for the reaction is always negative.
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- an indicator provides evidence that a certain condition exists or certain results have or have not been achieved brizius campbell p a 15 indicators enable decision makers to assess progress towards the achievement of intended outputs outcomes goals and objectives
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Varicella Vaccine Booster Needed The academy recommends the first varicella dose be administered at age 12 to 15 months. However, Dr. Chaves and colleagues noted, No long-term data are available on the duration of immunity afforded by the second dose of vaccine..
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- DEFINITION 1: Performance indicator refers to the means by which an objective can be judged to have been achieved or not achieved. Indicators are therefore tied to goals and objectives and serve simply as ‘yardsticks’ by which to measure the degree of success in goal achievement.
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pH indicator pH indicator. A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions (H3O+) or hydrogen ions (H+) in the Arrhenius model.
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What's in a name? On indicators, measures and metrics According to OECD/DAC, an indicator is: A quantitative or qualitative factor or variable that provides a simple and reliable means to measure achievement, to reflect changes connected to an intervention, or to help assess the performance of a development actor.