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# Properties of matter pp

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• ### Properties of matter pp

1. 1. Properties of Matter Chapter 2 Maria Passarelli
2. 2. Pure Substances• Every sample of a given substancehas the same properties because a substance has a ﬁxed, uniform composition
3. 3. Elements• An element has a ﬁxed composition because it contains only one type of atom.• An atom is the smallest particle of an element
4. 4. Compounds Hydrogen+Oxygen =Water• A compound always contains two or more elements joined in a ﬁxed proportion
5. 5. Mixtures• The properties of a mixture can vary because the composition of a mixture is not ﬁxed
6. 6. Heterogeneous Mixtures• In a heterogeneous mixture, the parts of the mixture are noticeably different from one another
7. 7. Homogeneous Mixtures• In a homogeneous mixture, the substances are so evenly distributed that it is difﬁcult to distinguish one substance in the mixture from another
8. 8. Solutions, Suspensions, and Colloids• Based on the size of its largest particles, a mixture can be classiﬁed as a solution, a suspension, or a colloid
9. 9. Solutions• When substances dissolve and form a homogeneous mixtures, the mixture that forms is called a solution
10. 10. Suspentions• A suspension is a heterogeneous mixture that separates into layers over time
11. 11. Colloids• A colloid contains some particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension
12. 12. Physical Properties• Viscosity, conductivity, malleability, hardness, melting point, boiling point, and density are examples of physical properties
13. 13. Viscosity• The tendency of a liquid to keep from ﬂowing-its resistance to ﬂowing-is called its viscosity
14. 14. Conductivity• A material’s ability to allow heat to ﬂow is called conductivity
15. 15. Malleability• Malleability is the ability of a solid to be hammered without shattering
16. 16. Density• Used to test the purity of a substance• Mass/Volume=Density
17. 17. Using Physical Properties• Physical properties are used to identify a material, to choose a material for a speciﬁc purpose, or to separate the substances in a mixture
18. 18. Using Properties to Separate Mixtures• Filtration and distillation are two common separation methods
19. 19. Filtration• Filtration is a process that separates materials based on the size of their particles
20. 20. Distillation• Distillation is a process that separates the substance in a solution based on their boiling points
21. 21. Evaporation• a process used to isolate a solid dissolved in a liquid• Disclaimer- you are not going to isolate a pure sample of all components of the mixture!
22. 22. Physical/Chemical Change• A physical change occurs when some of the properties of a material change, but the substances in the material remain the same• A chemical change occurs when a substance reacts and forms one or more new substances
23. 23. Chemical Properties• Chemical Properties can be observed only when the substances in a sample of matter are changing into different substances.
24. 24. Flammability• Flammability is a material’s ability to burn in the presence of oxygen
25. 25. Reactivity• The property that describes how readily a substance combines chemically with other substances in reactivity
26. 26. Recognizing Chemical Change• Three common types of evidence for a chemical change are a change in color, the production of gas, the formation of a precipitate, and a change in temperature
27. 27. How can you distinguish a physical change from a chemical change?
28. 28. List four pieces of evidence that show something is a chemical change?
29. 29. What is the differencebetween a physical and chemical change?
30. 30. What is the technique for a chemical separation?
31. 31. What is a “Formation of a precipitate?”