The length of a wooden block is measured to be 8.45 cm. Calculate the uncertainty associated with this measurement. What is the actual range of lengths that this measurement represents?With work.

The modern periodic table has groups.

Which statement best describes the flow of energy in this scenario

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 .