Steel Wool Lab 1. 2. 3. Did the mass of the steel wool stay the same, increase, or decrease? Explain why happened What this a chemical or physical change? According to the law of conservation of mass, matter cannot be created nor destroyed. All I did was supply energy to the iron (remember, energy is NOT matter). So, how can we explain the result that we saw?? What might be possibly adding mass to the steel wool? 4. 5. What does the particle diagram look like of Iron (steel wool)? What does the particle diagram look like after it reacted with Oxygen?