FAQ: What Does Indicator Mean In Science?

What is indicator mean?

noun. a person or thing that indicates, signals, or points out. a pointing or directing mechanism, as a pointer on the dial of an instrument to show pressure, temperature, speed, volume, etc., or a moveable icon in the graphical user interface of a computer or other device: The fuel indicator was pointing to empty.

What is an indicator in an experiment?

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 as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.

What is an indicator Short answer?

Answer: Indicators are chemical compounds that tell us whether a substance is acidic or basic by changing its colour. When added to an acidic solution or a basic solution, indicators change their colour and this change in colour is different for the acids and bases.

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What are two examples indicators?

eg:- Litmus, red cabbage, turmeric, china rose petals etc.. lndicators prepared in laboratary are callwd synthetic indicators. lndicators which give different odours in acidic and basic medium.

What is the role of an indicator?

Indicators are substances that are used to test whether a substance is acidic or basic ot neutral in nature. They change their color when added to a solution containing an acidic or a basic substance. Acidity and alkalinity relate to pH, they may also be known as pH indicators.

What is the best definition for an indicator?

1: one that indicates: such as. a: an index hand (as on a dial): pointer. b(1): gauge sense 2b, dial sense 4a. (2): an instrument for automatically making a diagram that indicates the pressure in and volume of the working fluid of an engine throughout the cycle.

What are the types of indicator?

Type of indicators

  • Input indicators. These indicators refer to the resources needed for the implementation of an activity or intervention.
  • Process and output indicators. Process indicators refer to indicators to measure whether planned activities took place.
  • Outcome indicators.
  • Impact indicators.

What are the three types of indicators?

There are three types of economic indicators: Leading, Lagging and Coincident.

What is the purpose of an indicator in a titration?

The role of indicator in titration is to detect the endpoint of the titration. When the colour of the solution changes, it indicates that the concentration of the chemical specie has reached a critical range.

What is indicator and its types?

An indicator shows one color in an acidic medium and different colors in a basic medium so that they are called indicators. There are different types of indicators: Indicators derived from natural sources are called natural indicators. eg:- Litmus, red cabbage.

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What is an indicator Class 7?

Indicators are substances that are used to test whether a substance is acidic or basic ot neutral in nature. They change their color when added to a solution containing an acidic or a basic substance. Indicators are of two types – natural and artificial.

What are the four types of indicators?

According to this typology, there are four types of indicators: input, output, outcome and impact.

What are universal indicators give example?

Universal indicator

Indicator Low pH colour Transition pH range
Methyl red Red 4.8 – 6.0
Bromothymol blue Yellow 6.0 – 7.6
Thymol blue (second transition) Yellow 8.0 – 9.6
Phenolphthalein Colourless 8.3 – 10.0

What is an indicator name three common indicators?

(a) An indicator is a ‘dye’ that changes colour when it is put in an acid or a base. The three most common indicators are: Litmus, Methyl orange and Phenolphthalein.

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