Variable combination of 2 or more pure substances. p.g. 59 Mixtures Variable combination of 2 or more pure substances. Heterogeneous – visibly separate, different parts Homogeneous – Same throughout

prefixes Homo – same Hetero - different

Heterogeneous V.S. Homogeneous Heterogeneous mixtures Each substance can have different properties Vegetable soup contains different substances with different properties in different concentrations. Example: more carrots than peas with uneven distribution throughout the mixture (soup). Homogeneous mixtures Contain more than one substance. Substances are mixed and distributed evenly throughout the mixture. When mixed are difficult to see or separate out. Example: sugar and tea, once mixed the sugar is dissolved and evenly distributed in the mixture. We call a mixture of two or more substances that looks identical throughout a Solution.

Heterogeneous Mixtures Review Homogeneous Mixture Solution-contains a solvent and at least one solute. (Solutes and solvents can be gas, liquid, or solid) Heterogeneous Mixtures Colloid-contains larger particles than a solution. Supsension-a mixture in which particles can be seen and easily separated by settling or filtration.

REVIEW-Comparing Mixtures and Compounds Substances remain the same; no chemical bonding occurs. Can be separated by physical means. Proportions of different substances in a mixture can vary throughout the mixture or from mixture to mixture. Compounds New substances formed by atoms that bond together Can only be separated by breaking atomic chemical bonds. Proportions of different substances are in a compound are fixed. The type and number of atoms in a compound are always the same.

Mixtures of Matter Separating Mixtures: a compound can be difficult to separate into its elements, but a mixture is usually easy to separate into its components because each component keeps its own properties Separation Methods: magnetic attraction, filtration, distillation, and evaporation

Can it be physically separated? Matter Flowchart yes no Can it be physically separated? Is the composition uniform? no yes Can it be chemically decomposed? no yes

Can it be physically separated? Matter Flowchart MATTER yes no Can it be physically separated? MIXTURE PURE SUBSTANCE Is the composition uniform? no yes Can it be chemically decomposed? no yes Homogeneous Mixture (solution) Heterogeneous Mixture Compound Element Colloids Suspensions