Presentation on theme: "Classifying Matter: Elements, Compounds, and Mixtures"— Presentation transcript:
1 Classifying Matter: Elements, Compounds, and Mixtures N. Sassaman – 7th/8th grade ScienceSelinsgrove Area Middle School
2 Pure substances vs. Mixtures Use the following link, along with your additional notes, to begin your review on the differences between pure substances and mixtures.Next, watch the following video from Discovery to help with your review.
3 Notes Complete p. 8 in your packet as you go through this review. You may use information from this slideshow, your additional notes, or the textbook.
4 Pure Substances Atoms Elements Compounds Molecules A sample of matter that has definite chemical and physical properties.AtomsElementsCompoundsMolecules
5 pure substance that cannot be separated into simpler substance by physical or chemical means. Elements
6 CompoundsPure substance composed of two or more different elements joined by chemical bonds.Made of elements in a specific ratiothat is always the sameHas a chemical formulaCan only be separated bychemical means, not physicallyH2ONaClCO2
7 MixturesA combination of two or more pure substances that are not chemically combined.substances held together by physical forces, not chemicalNo chemical change takes placeEach item retains its propertiesin the mixtureThey can be separated physically
9 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.Mixtures can be either heterogeneous (suspensions) or homogeneous (solutions)Now, let Tim and Moby help you along with your review. Click on the link below, watch the video, then try the quiz at the end!
10 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.As the correct answer is given, complete the ‘Elements, Compounds, Mixtures’ table in your additional notes.