Classification of Matter

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Presentation transcript:

Classification of Matter

Classification of Matter Now that we have defined chemical and physical properties of matter, we can use that to help us classify it. One way chemists classify matter is based on its purity.

Classification of Matter Pure Substance – Matter that has only 1 set of chemical and physical properties. Example: Pure water always has the exact same chemical and physical properties under the same conditions. If water ever tastes different then it isn’t pure water; it fits into our next category.

Classification of Matter Mixture – Two or more pue substances mixed together. Each substance in the mixture retains its own set of chemical and physical properties. Even though it may look different, it is still copper and zinc. Each metal retains its own properties like melting point. Example: Copper and Zinc can be mixed together to produce brass.

Classification of Matter Mixture – Two or more pure substances mixed together. Each substance in the mixture retains its own set of chemical and physical properties. Unlike pure substances, mixtures can always be separated by physical means. How could we separate the copper and zinc back out?

Mixtures Mixture – Two or more pure substances mixed together. Each substance in the mixture retains its own set of chemical and physical properties. If a sample of sand contains iron and salt, how could you separate them from the other minerals?

Mixtures Some mixtures are more pure than others. Heterogeneous mixture – Uneven distribution of substances. (Very impure) - You can see the different parts. Examples: Sand Granite Wood

Mixtures Some mixtures are more pure than others. Heterogeneous mixture – Uneven distribution of substances. (Very impure) - You can see the different parts. Examples: Milk Blood

Mixtures Homogeneous Mixture – Components are evenly mixed. (More pure than heterogeneous) - Cannot see the parts. Salt water contains salt and water, but are mixed all the way to the atomic level , but it can still be separated by physical means. Seawater distillation plant

Pure Substances Pure substances can also be divided into 2 categories: compounds and elements.

Pure Substances Compound – Two or more elements chemically bonded together. Examples: Carbon Dioxide (CO2) Water (H2O) Salt (NaCl) Sucrose (C12H22O11)

Pure Substances Compounds have only 1 set of properties. They cannot be separated by any physical process. - Can only be separated by a chemical reaction. Water can be separated into Hydrogen and Oxygen by a process called Electrolysis.

Pure Substances Elements – Substances made up of only one type of atom. - Cannot be separated by any physical OR chemical process. Examples: Carbon Helium Gold

Matter Mixture Element Pure Substance Can be separated physically Cannot be separated physically Mixture Pure Substance Cannot see the parts Can be separated chemically Can see the parts Cannot be separated Heterogeneous Mixture (Cement, pizza, soup) Homogeneous Mixture (Salt water, steel, tea) Compound (Salt, sugar, Hydrochloric acid) Element Copper, oxygen, Hydrogen Most impure Most pure