Question

ORAL QUESTIONS
1. What is the difference between the symbol and the formula of oxygen?
2. What specific name is given to the number of hydrogen atoms that can combine with or be
displaced by one atom of an element? Is this a modern definition?
3. An element X forms a compound XH, with hydrogen. Another element Y forms a compound
YX, with X. Given that the valency of hydrogen is 1, what are the valencies of X and Y?
4. Is the equation: Na + HO NaOH + H, balanced? Why?​

Answer 1

Answer:

1. SYMBOL OF OXYGEN IS 'O' BUT THE FORMULA OF OXYGEN IS 'O2'.
2. VALENCY. IT IS NOT A MODERN DEFINITION. THE MODERN DEFINITION IS : THE NUMBER OF ELECTRONS THAT AN ATOM CAN LOSE, GAIN OR SHARE DURING A CHEMICAL REACTION IS CALLED VALENCY.
3. VALENCY OF X AND Y IS 1.
4. NO. The mass on the left hand side is not equal to the mass on the right hand side. Therefore it is not a balanced equation.

T H A N K S