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12 Cards in this Set
- Front
- Back
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What is Chemistry?
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The study of matter and its properties, the changes that matter undergos, and the energy associated with those changes
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Matter
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The "stuff" of the universe: air, glass, planets, students--anything that has mass and volume
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The composition of matter
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The types and amounts of simpler substances that make it up. A substance is a type of matter that has a defined, fixed composition.
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The properties of matter
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The characteristics that give each substance its unique identity. To identify a substance, chemists observe two types of properties, physical and chemical.
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Physical properties
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Those that a substance shows by itself, without changing into or interacting with another substance. Ex-- color, melting point, electrical conductivity, and density.
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Physical change
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Occurs when a substance alters its physical form, not its composition. Thus, a physical change results in different physical properties. (Same substance before and after)
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Chemical properties
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Those that a substance shows as it changes into or interacts with another substance (or substances). Ex-- flammibility, corrosiveness, reactivity with acids
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Chemical change (reaction)
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Occurs when a substance (or substances) is converted into a different substance (or substances). Different substances before and after
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Matter occurs in what three physical forms, called states?
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Solid, liquid, and gas
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Solid
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A solid has a fixed shape that does not corform to the container shape. Particles close together and organized.
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Liquid
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A liquid conforms to the container shape but fills the container only to the extent of the liquid's volume; thus, a liquid forms a surface. Particles close together but disorganized
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Gas
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A gas conforms to the container shape also, but fills the entire container, and thus, does not form a surface. Particles far apart and disorganized
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