1. What is the valency of hydrogen in CH,? Explain. 2. State the significance of writing molecular formula of a compound. 3. State the law of conservation of mass. 4. Why do we use symbols to represent elements?
Answers
Answered by
0
Answer:
1.It is formed by one carbon atom and four hydrogen atom. Hydrogen has its valency 1 and carbon being tetravalent needs four valence electrons to acquire noble gas configuration, where it shares its 4 electrons with four hydrogen atoms.
2.A chemical formula of a substance (element or compound) represents its name. A chemical formula provides important information on the chemical makeup of any substance (element or compound). It names all the elements present in the molecule.
3. The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity cannot be added nor removed. Hence, the quantity of mass is conserved over time.
4.As you learned, scientists standardized the short-hand way we represent elements, by their chemical symbol. One of the main reasons this was developed was because using letters was the easiest way to represent the elements. Another reason that we use chemical symbols is to allow us to write chemical formulas easily.
Similar questions