Q1.What is the chemical name of the following: a. Quick Lime b. Baking Soda c. Vinegar d. Milk of Magnesia e. Slaked lime Q2. Rohan was playing while eating his tiffin in the school. Suddenly his yellow curry fell on his white shirt and he noticed that the turmeric stain on his shirt turned to red when it is washed with soap. Can you make him understand the science behind this? Q3. Give reasons for the following: a. Working tables and shelves in your chemistry laboratory are covered with tiles and not wood or metals. b. Acids taste sour. However, they must not be tasted in order to be identified.
Answers
Answer:
a)oxocalcium
b)sodium bicarbonate
c)Ascetic acid
d)magnesium hydroxide
e)calcium hydroxide
Explanation:
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Answer:
Q1)
1)Calcium oxide
2)Sodium hydrogen carbonate
3) acetic acid
4)Magnesium hydroxide
5)Calcium hydroxide
Q2) turmeric is natural indicator and soap have basic nature.Bases turn turmeric red. Hence, when soap (which is basic in nature) is scrubbed on the stain, the stain turns red.
Q3)
a) because in laboratory we perform experiments with acid and base which highly corrid in nature.
They reacts with metal, woods,etc.
b)acid taste sour because acid donte H+ ion when react with another substance and due to accumulation of H+ ion in our tounge this it gives sour taste to us
we generally eat some Citrus fruit like lemon, orange,etc which contain citric acid in them are always sour in taste. From this two point we can prove that acids are sour in taste.