Two questions: will mark

explain why a thrown foot ball have both potential and kinetic energy? what is the combined energy called?

use the picture for this one.
how do the principles of convection, conduction, and radiation explain how the water in the saucepan gets hot?

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).