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| anything that occupies space and has mass |
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| quantity of matter which a substance possesses |
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is weight or mass constant?
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| property of mass to resist a change of position or motion |
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D=m/V
relationship of mass to a unit of volume
Standard unit: grams/liter
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| both a definate size and shape |
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| has a definite volume but not a definate shape |
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| neither a definate shape or volume |
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| How are states of matter changed? |
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| addition or subtraction of heat energy |
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subdivided into the smallest particle that still has the properties of that substance
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| substance that is made up of only one kind of atom |
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Greeks
smallest possible piece of something |
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| two or more kinds of atoms joined together in a definite grouping |
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| Law of Definite Composition (Proportions) |
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Definition
| combining atoms of two or more elements in a definite proportion |
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| smallest naturally occurring unit of a compound |
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| A molecule of a compound has.... |
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| definite shaped that is determined by how the atoms are bonded to or combined with each other |
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Definition
1.indefinite composition
2.properties retained
3.react differently to changed conditions |
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Definition
Elements
1.One kind of atom
2. Homogeneous
Compounds
1. Homogeneous
2. All parts react the same
3.Distinct and different properties from the elements that they are made up from
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properties that can usually be observed with our senses
ex. color, odor, solubility in water, density, taste, hardness |
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properties that can be observed in regard to whether or not a substance changes chemically
ex. iron rust, sodium reacts with water,water can be decomposed by an electric current |
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alters some aspect of the physical properties of matter, but the composition remains constant
ex. breaking glass, cutting wood, melting ice
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Definition
changes in the composition and structure of a substance
accompanied by engergy changes |
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| engergy given off in form of heat or light or both |
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| energy necessary to get the reaction going by increasing the energy of the reactants so they can combine |
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