Properties of Matter    Chapter 2      Maria Passarelli
Pure Substances• Every sample of a given substancehas the  same properties because a substance has a  fixed, uniform compos...
Elements• An element has a fixed composition  because it contains only one type of atom.• An atom is the smallest particle ...
Compounds                              Hydrogen+Oxygen                                  =Water• A compound always contains...
Mixtures• The properties of a mixture can vary  because the composition of a mixture is  not fixed
Heterogeneous        Mixtures• In a heterogeneous mixture, the parts of  the mixture are noticeably different from  one an...
Homogeneous         Mixtures• In a homogeneous mixture, the substances  are so evenly distributed that it is difficult  to ...
Solutions, Suspensions,     and Colloids• Based on the size of its largest particles, a  mixture can be classified as a sol...
Solutions• When substances dissolve and form a  homogeneous mixtures, the mixture that  forms is called a solution
Suspentions• A suspension is a heterogeneous mixture  that separates into layers over time
Colloids• A colloid contains some particles that are  intermediate in size between the small  particles in a solution and ...
Physical Properties• Viscosity, conductivity, malleability,  hardness, melting point, boiling point, and  density are exam...
Viscosity• The tendency of a liquid to keep from  flowing-its resistance to flowing-is called its  viscosity
Conductivity• A material’s ability to allow heat to flow is  called conductivity
Malleability• Malleability is the ability of a solid to be  hammered without shattering
Density• Used to test the purity of a substance• Mass/Volume=Density
Using Physical         Properties• Physical properties are used to identify a  material, to choose a material for a specifi...
Using Properties to  Separate Mixtures• Filtration and distillation are two common  separation methods
Filtration• Filtration is a process that separates  materials based on the size of their  particles
Distillation• Distillation is a process that separates the  substance in a solution based on their  boiling points
Evaporation• a process used to isolate a solid dissolved  in a liquid• Disclaimer- you are not going to isolate a  pure sa...
Physical/Chemical         Change• A physical change occurs when some of the  properties of a material change, but the  sub...
Chemical Properties• Chemical Properties can be observed only  when the substances in a sample of matter  are changing int...
Flammability• Flammability is a material’s ability to burn in  the presence of oxygen
Reactivity• The property that describes how readily a  substance combines chemically with other  substances in reactivity
Recognizing Chemical      Change• Three common types of evidence for a  chemical change are a change in color, the  produc...
How can you distinguish a physical change from a   chemical change?
List four pieces of evidence that show something is a      chemical change?
What is the differencebetween a physical and   chemical change?
What is the technique  for a chemical    separation?
What is a “Formation of a precipitate?”
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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?”

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