Chemical formula
Texte du Storyboard
- 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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