WILL MARK YOU BRAINLEIST What do sound waves need to have to travel from one place to another? What do sound waves need to have to travel from one place to another?

Question 5 options:

steel

water

air

a medium

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

What metric units would you use to measure the thickness of a key

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .