SCIENCE CLASS 16/06/2020 VIRTUAL CLASS DETAIL AND CLASS HOMEWORK

Subject: SCIENCE 
16/06/2020
Virtual online classes

Ch-2 Acid Base and salt

TOPIC TAUGHT:
  • IMPORTANCE OF PH.(today)
  • INDICATOR .(today)
Note:
Watch Video no.5 from between  us portal.

HOMEWORK:

Q.1 Form a flow chart of indicator:




QUESTION:AN ACTIVITY based on dilution of acid/base with water



Q. what are strong and weak acids? IN the following list of acids, separate strong acids from weak acids.
Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid and sulphuric acid.

 Q.Why do teeth decay ? and how can be prevented.

Q.why do people use antacid at the time of indigestion.

Q.what are acid - base indicators?

Q. Fresh milk has a PH of 6. how do you think the pH will change as it turns into curd? Explain your answer.

Q.why do acids not show acidic behaviour in the absence of water.

Q.Under what soil condition do you think a farmer would treat the soil of the fields with quicklime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?

Q.how litmus is obtained and what is the colour of solution of litmus. and state the type of litmus paper.

Q.what is the dilution of acid or bases? and what happens in the solution.

Q.what are olfactory indicators?


NOTES USED(MATERIAL)


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