4. The chemical formula for a certain substance is shown here. Be3Al2(SiO3)6 How many different elements are present in the substance represented by the chemical formula shown?

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;