Air-activated hand warmers consist of an iron powder contained in a porous pouch. When the pouch is removed from its air-tight packaging, oxygen from the air enters the pouch and reacts with the iron to produce iron(III) oxide. Construct an explanation for why the pouch gets hot based on changes in total bond energy.

Which of the following is not a good technique for managing used oil? a) have specific, labeled catch pans available for technicians who are collecting oil b) spills in your shop and any releases on pavement or outside should be poured down a drain c) do not use oil containers for antifreeze or other non-similar fluids d) be prepared for oil spills with the proper absorbents

What are the similarities of physical and chemical change ?

Explain that newton first law,second law and third law of motion?