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Ch 3 Chemistry

Module 2 Vocabulary

TermDefinition
The Law of Mass Conservation Matter cannot be created or destroyed, it can only change forms.
Element Any substance that cannot be broken down (decomposed) into simpler components.
Compounds Substances that can be decomposed into elements by chemical means.
The Law of Definite Proportions The proportion of elements in any compound is always the same.
The Law of Multiple Proportions If 2 elements combine to form different compounds, the ratio of masses of the second element that react with a fixed mass of the first element will be a simple, whole-number ratio.
Pure substance A substance that contains only one element or compound.
Mixture A substance that contains different compounds and/or elements.
Homogeneous mixture A mixture with a composition that is always the same no matter what part of the sample is observed.
Heterogeneous mixture A mixture with a composition that is different depending on what part of the sample is observed.
Created by: ChristiSBraun
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