4. You are asked to explain physical and chemical changes using a newspaper How will you demonstrate the two types of changes?
5. A brick is broken into several pieces. What type of change is involved? Will the mass and
volume change?

How much energy is made when a pice of wood burns. how do you know

Heat is the total potential energy of a substance that can be transferred. true false

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 .