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24 Cards in this Set
- Front
- Back
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the scientific study of the composition, structure, and properties of matter and the changes that undergoes matter
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Chemistry
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anything that has mass and takes up space
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Matter
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a substance that cannot be separated or broken down into simpler substances by chemical means
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Element
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the smallest unit of an element that maintains the properties of that element
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Atom
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a substance made of atoms of two or more different elements that are chemically combined
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Compound
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the smallest unit of a substance that keeps all of the physical and chemical properties of that substance
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Molecule
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a combination of chemical symbols and numbers to represent a substance
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Chemical formula
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a sample of matter, either a single element or a single compound, that has definite chemical and physical properties
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Pure substance
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a combination of two or more substances that are not chemically combined
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Mixture
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3 most common element in the Earth's crust
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•Iron
•Oxygen •Silicon |
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3 most common elements in the human body
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•Oxygen
•Carbon •Hydrogen |
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not mixed uniformly nor evenly distributed
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Heterogeneous mixture
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evenly distributed and same throughout
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Homogeneous
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liquid mixture in which one substance dissolves in another
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Miscible
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liquid mixture in which one substance does not dissolve in another
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Immiscible
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the temperature and pressure at which a solid becomes a liquid
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Melting point
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the temperature at which a liquid becomes a gas
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Boiling point
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the ratio of the mass of a substance to the volume of a substance
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Density
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the ability of a substance to combine chemically with another substance
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Reactivity
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the ability of a substance to react in the presence of oxygen and burn when exposed to a flame
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Flammability
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Physical Properties of Matter
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•Shape, color, odor
•Texture, strength, density •Ability to conduct electricity, magnetism, or heat •Melting point •Boiling point •State of matter |
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Chemical properties of Matter
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•Are not as easy to observe as physical properties
• Describe how a substance reacts or changes into a new substance |
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a change of matter from one form to another without a change in chemical properties
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Physical change
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a change that occurs when a substance changes composition by forming one or more new substances
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• Chemical change
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