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The rearranging of the chemical make-up of matter is called a chemical reaction. This is what will constitute a chemical change as it will alter the chemical composition.
These are physical changes.
The type of weathering that does not alter the chemical composition of the rock is called physical weathering. The acid weathering usually alter the chemical composition of a rock.
It's called chemical weathering/chemical change. Similar to the physical change of matter, except the chemical composition changes causing it to become something completely different. For example: iron turns to rust, silver tarnishes and copper turns green.
Chemical Substance
The eubacteria and that chemical composition is called peptidoglycan.
Light is made up of particles with wave properties called "photons". It has no chemical composition.
mixture
when 2 or more compounds react chemically to form a new compound then it is called chemical reaction chemical reaction whereas the quantity and no. chemical elements presents in chemical compound is called the chemical composition
A mixture whose composition is uniform throughout is called Homogeneous Mixture.
This is a homogeneous mixture.
During cooking the chemical composition of eggs is changed.