When a gas is cooled is the particles moving fast or slowly

What forms when chemical reactions combine pollution with sunlight?

Define a is a tiny pavket of energy

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume