30. Why is it necessary to use prefixes in naming covalent compounds? Please use at least THREE

complete content related sentences. (Ref: p.248-252)

Please see explanation column for answer

Explanation:

--This is because prefixes are  ” mono-” which indicates one,   “di-” which  indicates two, “tri-” indicates  three, “tetra-”indicates four, “penta-” indicates five, and “hexa-”indicates six, “hepta-” indicates  seven, “octo-” indicates eight, “nona-” indicates nine, and “deca” indicates ten.

---IT is necessary to use prefix because they show the  the number of a given element present in the compound.

when there are  no ionic charges to balance out in molecular compounds, we  use prefixes  to name the compound

eg N2O5 = dinitrogen pentoxide

- it makes it easier to naming molecular compounds for examples while indicating number of atoms presentSO2 is  sulfur dioxide  and SF6 is called sulfur hexafluoride

1)Prefixes are needed to indicate the number of atoms of each

2)if a molecule contains more than one atom of both elements, then prefixes are used for both.

3)In some names, the final a or o of the prefix is dropped to avoid awkward pronunciation.

Explanation:

NB: To buttress 2) N2O3 is dinitrogen trioxide

-To buttress 3) OsO4 is osmium tetroxide rather than osmium tetraoxide

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied