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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.
A substance with identical properties throughout is called a pure substance. Examples include elements (e.g. gold, oxygen) and compounds (e.g. water, salt) that are uniform in composition and have consistent physical and chemical characteristics.
Lithium iodide is a chemical compound, not a mixture.
A pure material is called a substance. It is a form of matter that has uniform and definite composition, with distinct physical and chemical properties.
Substance, classified as an element and compound. For an element, it cannot be separated into another simplier substance; for a compound, it can be dicomposed into elements using chemical processes.
Matter that has the same composition and properties throughout is called a substance. Substances can be classified into elements, which consist of only one type of atom, and compounds, which are made up of two or more different elements chemically combined in fixed proportions. Unlike mixtures, which can vary in composition, substances maintain consistent characteristics and behavior.
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.
mixture