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Chemistry is the study of matter and the changes that occur.
Two major types of changes.
- Physical changes- the substance is not changed. Ice turns to water.
- Chemical change- the chemical nature of the substance is changed. Water changed to hydrogen and oxygen. Chemical change releases or absorbs much energy.
The three states of matter.
Learn the definition of the following:
- Matter- any substance with length, width, and height.
- Element- the smallest pure substance with the same number of protons in each nucleus of the atom.
- Compound- the combination of two or more simpler substances resulting in different properties.
- Mixture- the combination of two or more substances that do not chemically combine to form new properties. The are two kinds: heterogeneous (not evenly distributed components) and homogeneous (evenly distributed components).
- Solution- substance that is dissolved in water.