Quarter 1-Grade 7-week 4.2-SUBSTANCE.pptx
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A substance is a particular kind of matter that has uniform properties, including a constant chemical composition and characteristics. Substances have physical properties that can be observed without chemically changing the substance, such as melting point or boiling point. Substances also have chemical properties that describe how they interact with other substances, like tarnishing, rusting, or changes in color or composition during chemical reactions. Some examples of physical and chemical properties are provided.
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2019 PATTERN.
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6:个人职称评审加20分
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