The scientific study of matter and its properties, the changes it undergoes, and the energy associated with those changes.
The types and amounts of simpler substances that make up a sample of matter.
A change in which the physical form (or state) of a substance, but not its composition, is altered.
A characteristic of a sample of matter that is fixed by its state.
The measurement of a physical property may change the arrangement of matter in a sample, but not the structure of its molecules. In other words, a physical property may involve a physical change, but not a chemical change.
The simplest type of matter with unique physical and chemical properties.
A type of matter, either an element or a compound, that has a fixed composition.
An independent structure consisting of two or more atoms chemically bound together.
A group of two or more substances that are physically intermingled.
The Law of Mass Conservation
The total mass of substances does not change during a chemical reaction. (matter cannot be created or destroyed)
Law of Definite Composition
No matter what its source, a particular compound is composed of the same elements in the same parts by mass.
Law of Multiple Proportions
If elements A and B react to form two compounds, the different masses of B that combine with a fixed mass of A can be expressed as a ratio of small whole numbers.
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