The identity of a substance (chemical compound) is defined by his chemical formula and molecular structure.
Many physical changes will not alter the identity. However, some physical changes, such as heating or cooling will result in phase changes and so the identity will be different. While ice and water are chemically the same, they are not identical forms of the substance.
A physical process does not change the chemical identity of a substance. Examples include changing the state of matter (like melting or freezing), dissolving, or distillation.
Density can be used to determine the identity of a substance by comparing the density of the unknown substance to the known densities of different substances. Each substance has a characteristic density, so if the density of the unknown substance matches that of a known substance, it can help identify the unknown substance.
The compounds identity remain unchanged; but the new mixture is different.
Physical properties are characteristics that can be observed or measured without changing the composition of the substance. When physical properties are altered, such as when a substance changes state (solid to liquid), the basic chemical composition remains the same, indicating that it is still the same kind of matter.
The identity of a substance (chemical compound) is defined by his chemical formula and molecular structure.
No, a physical property DOES NOT change the identity of a substance. That would be a chemical property which DOES change the identity.
By density
The identity of the substance reamain unchanged.
A physical change is when a substance changes, but still keeps its identity. When a chemical change occurs, the substance changes its identity.
Many physical changes will not alter the identity. However, some physical changes, such as heating or cooling will result in phase changes and so the identity will be different. While ice and water are chemically the same, they are not identical forms of the substance.
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Appearance
A property of matter that can be identified without changing the identity of the substance is its density. Density is a characteristic property that remains constant regardless of the amount of substance present.
If that substance is an element, the smallest part is the atom which, if broken down further into atomic particles, loses its identity.
It can be observed without changing the identity of the object.
The compounds identity remain unchanged; but the new mixture is different.