What molecules are found in all or almost all organic compounds?
a.
carbon and oxygen
c.
carbon and nitrogen
b.
hydrogen and oxygen
d.
carbon and hydrogen

D. Carbon and hydrogen

Explanation:

Organic compounds have a main chain made of carbons, with hydrogens attached. As the compound gets more complex other types of atoms might be added but the base carbons and hydrogens are almost always there.

the role of the microscope world in creating new materials .

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).