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Showing posts with label PISA. Show all posts
Showing posts with label PISA. Show all posts
Sunday, February 7, 2021

pH CHANGE AS THE CAUSE OF TOOTH DECAY

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  Tooth decay starts when the pH of the mouth is lower than 5.5. Tooth enamel, made up of calcium hydroxyapatite (a crystalline form of calc...

Refined sugar

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  Sucrose is a common sugar. It is a disaccharide, a molecule composed of two monosaccharide units ie glucose and fructose. Sucrose is prod...

MANUFACTURING PROCESS OF SOAP

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  The fats and oils required for manufacturing soap are extracted from the plants and animals.   To make the fatty acids called triglyceride...

Valence

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Valence , also spelled  valency , in  chemistry , the property of an element that determines the number of other atoms with which an  atom  ...

Horrendous air pollution in India

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India is once again heading into the worst time of year for air pollution, a season where the country’s notoriously poor quality becomes eve...
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