Draw a line between the molecule and its name. Hydrogen chloride HCl Chlorine Cl2 Carbon dioxide CO2 Methane CH4

Classifying Matter: Compounds, Mixtures, Solutions

Atoms Elements Compounds Molecules Pure Substances A sample of matter that has definite chemical and physical properties. Atoms Elements Compounds Molecules

Compounds Pure substance composed of two or more different elements joined by chemical bonds. Made of elements in a specific ratio that is always the same Has a chemical formula Can only be separated by chemical means, not physically H2O NaCl CO2

Mixtures A combination of two or more pure substances that are not chemically combined. substances held together by physical forces, not chemical No chemical change takes place Each item retains its properties in the mixture They can be separated physically

Mixtures vs. Compounds

Can you identify the following? You will be shown a series of photos. Tell if each photo represents an item composed of an element, compound, or mixture. Review: An element contains just one type of atom. A compound contains two or more different atoms joined together. A mixture contains two or more different substances that are only physically joined together, not chemically. A mixture can contain both elements and compounds.

Element, Compound, or Mixture? Copper Rocks Mixture Element Cu

Element, Compound, or Mixture? Jelly Beans Table Sugar Mixture Compound C12H22O11

Element, Compound, or Mixture? Sand Diamond Element C Mixture

Types of Mixtures

Homogeneous mixtures Homogeneous mixtures : is a mixture in which the components are evenly distributed. A type of homogenous mixtures is a SOLUTION Examples: Salt dissolved in water, sugar dissolved in water, apple juice, tea, copper (II) sulfate solution in water, alloys....

Heterogeneous mixtures Heterogeneous mixture : the components are not evenly distributed among each other. Examples: Sand water, oil and water, milk, sulfur and iron, granite, blood...

Solutions A mixture that appears to be a single substance One substance is dissolved in another substance Solute – substance that is dissolved Solvent – substance that does the disolving Soluble – able to dissolve Insoluble – unable to dissolve Examples of solutions: Salt water Sugar water Gasoline Soft drinks Air

suspensions Mixture in which particles of a material are dispersed throughout a liquid or gas but large enough to settle out Can be separated by filtration Examples: Snow globe Italian dressing Medicines Orange juice

Read and summarize material (be prepared to share your answers) Mixtures States of Matter Separation of Mixtures