Answer:
A and C represent elements while B and D represent Compounds
Explanation:
chemical elements cannot be broken down into simpler substances by any chemical reaction. While A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds
Answer:5
Explanation:(H3) is 3 (H3)2 is 5
ENERGY WOULD BE RELALISED, MEANING BONDS ARE BEING BROKEN, SO IT IS AN EXOTHERMIC REACTION
Answer: 3.79*10^24 atoms
Explanation:
1 mole = 6.02214076*10^23 atoms
by radiation from the Earth's surface