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Chemical formula

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Chemical formula
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  •  Oh no! I don't even remember how to do it
  • good morning students! Let's have a quick revision on chemical formulas before we move on to the next topic
  • chemical formulas are so easy, why do we have to revise?
  • Now I'll choose the student to answer the question on the board because some students only open their books the day before the exam
  • Find the chemical formula of ammonium sulphate
  • oh no !
  • Find the chemical formula of ammonium sulphate
  • Nisha! please come to the board and answer this question , rest of you put your hands down!
  • Find the chemical formula of ammonium sulphate
  • First, write the symbols for each element, then their valency 
  • Please write the answer on the board.
  • Ma'am I'm not sure how to do it.
  • yes ma'am.
  • Find the chemical formula of ammonium sulphate
  • Ok good job! now go back to your seat .
  • SYMBOL NH4 So4 VALENCY 1 2
  • FORMULA (NH4)2 So4  
  • POTASSIUM BROMIDE
  • WOW! That was so easy, It would've been easier if I had studied
  • The next question is on the board and this question goes to...…..
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