MatterSection 1 2-1-6 Elements, continued Elements are represented by symbols.
MatterSection 1 2-1-7 Elements, continued Atoms that make up a molecule act as a unit.
MatterSection 1 2-1-8 Elements, continued molecule: a group of atoms that are held together by chemical forces; a molecule is the smallest unit of matter that can exist by itself and retain all of a substance’s chemical properties.
MatterSection 1 Compounds 〉 How are elements related to compounds? 〉 Each molecule of a compound contains two or more elements that are chemically combined. Elements combine chemically to form a compound.
MatterSection 1 2-1-9 Compounds compound: a substance made up of atoms of two or more different elements joined by chemical bonds
MatterSection 1 2-1-10 Compounds, continued Compounds have unique properties.
MatterSection 1 2-1-11 Compounds, continued Chemical formulas represent compounds.
MatterSection 1 Compounds, continued –The following chemical formula represents the compound for indigo:
MatterSection 1 2-1-12 Pure Substances and Mixtures 〉 What is the difference between a pure substance and a mixture? 〉 Elements and compounds are pure substances, but mixtures are not.
MatterSection 1 2-1-13 Pure Substances and Mixtures pure substance: a sample of matter, either a single element or a single compound, that has definite chemical and physical properties
MatterSection 1 2-1-14 Pure Substances and Mixtures mixture: a combination of two or more substances that are not chemically combined
MatterSection 1 2-1-15 Pure Substances and Mixtures, continued Mixtures are classified by how thoroughly the substances mix.
MatterSection 1 2-1-16 Pure Substances and Mixtures, continued –heterogeneous mixture: substances aren’t mixed uniformly and are not evenly distributed
MatterSection 1 2-1-17 Pure Substances and Mixtures, continued –homogeneous mixture: substances are evenly distributed, and the mixture is the same throughout
MatterSection 1 2-1-18 Pure Substances and Mixtures, continued –miscible: substances that can be mixed
MatterSection 1 2-1-19 Pure Substances and Mixtures, continued –immiscible: substances that cannot be mixed