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Solid- hard, particles do not move
Liquid- hard to compres, free to move (takes shape fo container), cannot chage volume
Gas- Fast moving, can change volume, empty space |
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Element- made up of atoms of the same type
Compound- Atoms of two or more different elements |
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Homogeneous- composition is the same form one region to another. Salt in water
Heterogeneous- composition varies from one region to another. Sand in water |
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• All matter is made up of tiny, indivisible particles called atoms
• Atoms cannot be created, destroyed, or transferred into other atoms in a chemical reaction
• Al atoms of a given element are identical
• Atoms combine in simple, whole-numbered ratios to form compounds |
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| Law of definite proportions |
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A compound is always made up of the same relative masses of the elements that compose it
o Ex: CO2 |
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| Law of multiple proportions |
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| Any time 2 or more elements combine in different rations, different compounds are formed |
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Can be measured w/o altering the chemical identity
o Ex. Can measure, see its color
• Boiling/melting point, density, hardness, texture, odor, electrical properties etc |
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When matter undergoes a chemical rxn & forms a new substance; characterize this via chemical equation
• Properties
o Describe the potential chemical rxns a substance can undergo
• Ex. Flammability, rusting, explosiveness
Fe2O3- rust. Fe- Iron |
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