Which of the following words best describe scientists current knowledge about the universe a) eternal b) staticc) unpredictable d) changing

The correct answer is "d) changing"

Explanation:

The universe is changing because it is expanding as proven by astronomers such as Hubble. The universe is cooling because of which it is expanding. Space is moving with the speed of light which is explained by Einstein's equation. It is believed that dark energy is causing the universe to expand.

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).