Physical changes:
1. I observed juice solidifying and becoming solid. It is a physical change because I saw the state, the size and the texture changing but not forming a new substance and also because this process is reversible.
2. I observed water boiling and becoming gaz. It is a physical change because I saw the state, the shape, and the texture changing but not forming a new substance and also because this process is reversible.
3. I observed Ice-cream melting and becoming a liquid. It is a physical change because I saw the state and the size and the texture changing but not forming a new substance and also because this process is reversible.
Chemical changes
1. I observed paper catching fire. It is a chemical change because it reacted with another substance to form a new substance and also because this process is irreversible.
2. I observed bread being deteriorated by my saliva. It is a chemical change because it reacted with another substance to form a new substance and also because this process is irreversible.
3. I observed some metals getting rusted because of the humidity outside. It is a chemical change because it reacted with another substance to form a new substance and also because this process is irreversible.
*Gas
ReplyDeletePhysical Change number 2.:
This is a physical change also, because the procedure can be reversed by capturing the gas and cooling it.
Chemical Changes number 1:
The chemical change is not with the fire but with the oxygen. Part of this reason is that fire is ENERGY and not an atom, and other part of the reason is that the fire is merely there to start the reaction with the oxygen
Jacob for physical change number 2 i already said that this process is reversible and for chemical change 1 i never said that the chemical change is with the fire i just said it catched fire. Anyways, thank you for this helpful and interesting information.
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