Q.1 Write fullform of pH and Importance of pH in daily life? Give reason why does tooth decay start when pH of mouth is lower than 5.5 Q.2 Find the temperature which is same in both Celcius and Fahrenheit scale of temperature. Q.3 Explain the conduction, convection and radiation with the help of example from our surroundings and give two differences between them. (a) CuSO4 (d) KNO3 (b) CH3COONH4 (C) MgCl2 (e) Ca(OH)
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Ans) 1. fullform of pH - Potential of Hydrogen,
Imporatnce of pH in daily life,
- In our digestive system : Hydrochloric acid produced in our stomach helps the digestion of food without causing any harm to the stomach. But when the amount of the acid goes beyond a certain limit due to indigestion, pain and irritation are created in the stomach.
- Acid is produced in fatigued muscle : As a result of physical exercise, stiffness and pain in the muscle starts due to the formation of lactic acid.
- Some animals and plants contain acids : Honey-bee injects an acid through its stings which causes pain and irritation. Hence, a mild base like baking soda is applied to treat the wound.
- The brilliance of a tarnished copper vessel can be restored by using acid : You know, lemon juice contains an acid. In order to clean a copper vessel, we rub it with the piece of a lemon.
Acids cause tooth decay because When we eat sugary food, it gets degraded by bacteria present in the mouth and an acid is formed. When the pH becomes lower than 5.5, tooth enamel gets corroded.
Ans.2) The Celsius and Fahrenheit are two important temperature scales. The Fahrenheit scale is used primarily in the United States, while Celsius is used throughout the world. The two scales have different zero points and the Celsius degree is bigger than the Fahrenheit one.
Ans.3)The main difference between conduction, convection and radiation is Conduction is nothing but the heat transfer from the hotter part to the colder one.
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