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What's the Matter?

Discovering Design with Chemistry chapter 2

Pure Substance A substance whose properties are the same throughout
Mixture A combination of two or more pure substances
Homogeneous mixture A mixture whose composition is the same throughout the sample
Heterogeneous mixture A mixture whose composition is different in different parts of the sample
Law of Mass Conservation In any chemical or physical process, the total mass of everything involved must remain the same
Element A substance that cannot be chemically broken down into simpler substances
Compound A pure substance that is composed of two or more elements
Law of Definite Proportions A given compound will always have the same proportion of elements by mass
Molecule A combination of two or more atoms joined together
Law of Multiple Proportions When two elements combine to form different compounds, a fixed amount of one element will combine with the other element so that the ratio of the masses of the other element is a small whole number
Isotopes Two or more atoms of the same element that have different numbers of neutrons
Created by: Pink Smiley Girl