Can someone me i do not undersatand

Okay so, each element always is abbreviated with a capital letter and a lowercase letter, so each each new elements starts with a capital letter. To answer these problem you have to find the element or compound and whats in the element/compound and count how many you have. Then, it transfers over the arrow to how many of each element you have.

I hope this helps! :)

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

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).