someone help me
chemical
Chemical energy!
Work of an atomic bomb is a physical process.
you would need warmth
Chemical
it takes one of the elements of the fire triangle
Free energy
Work of an atomic bomb is a physical process.
It is a physical change as it can be "undone" by evaporating the water. An simple example of a chemical change is baking a cake, you can't un-bake a cake. To work out whether it is a chemical or physical change just think whether it can be undone or not.
physical, chemical, biological, ergonomic and psycological hazards
Chemical(acid in rainwater dissolving limestone), biological (work of animals and plants) and physical (freeze thaw)
Bleaching your hair is a chemical process, not a physical property. The chemicals in hair bleach work to break down the natural pigments in your hair, resulting in a lighter color. This change is due to a chemical reaction rather than a physical characteristic of the hair itself.