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They are called pH indicators.
Tracers are indicators that can be followed through the steps of a chemical reaction.
No, a chemical change. Taste and smell are indicators of chemical composition, so a change in those would indicate a chemical change.
Many indicators are known today; see the link below.
Unemployment rate
The following are indicators of chemical changes: ... For example, changing the color of a metal does not change its physical properties.
Definite indicators of a chemical reaction include exothermic reactions (heat), colour change, bubbles and there might be a few morea new substance forms (study island)
Pain and sweating
Yes, you can. They are not as good as the chemical indicators, but they can indicate a basic acid/alkali difference.
Indicators are chemical solutions that are used for the main purpose of showing whether the tested solution is an acid or base. That being said indicators can be acids or bases.
They are called pH indicators.
tomato's red cabbage
These substances are called pH indicators.
Chemical indicators measure the pH directly Chemical indicators are highly expensive They must be chosen for a specific pH range Chemical indicators cannot determine the exact value of pH of the solution
With PH indicators, showing acidity and alkalinity, green is neutral, blue-purple is alkaline, yellow-red is acid.
Some indicators include:Change in TemperatureChange in ColorNoticeable Odor (after reaction has begun)Formation of a PrecipitateFormation of BubblesWhen two or more reactants are mixed and a change in temperature, color, etc. is noticed, a chemical reaction is probably occurring. These are not definite indicators; a chemical reaction may not be occurring. A change in color is not always a chemical change. If one were to change the color of a substance in a non-chemical reaction scenario, such as painting a car, the change is physical and not chemical. This is because the composition of the car has not changed. Proceed with caution.
Tracers are indicators that can be followed through the steps of a chemical reaction.